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pedalSHIELD UNO

Библиотека добавлена: 10 июня 2019
Категория библиотеки:

Это краткое руководство по работе с pedalSHIELD UNO. Ниже вы найдете ссылки на код для педали для получения различных эффектов. Статью по работе с этим модулем смотрите по ссылке.

Скетчи/код для разных эффектов педали

Bit-Crusher эффект

Этот эффект перемещает биты входного сигнала с помощью операции <<, создавая высокий искаженный звук. Кнопки модуля делают эффект более или менее агрессивным.

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
/* pedalshield_uno_bit_crusher.ino reads the ADC and shift the bits creating a high distorted sound
 *  pressing the pushbutton_1 or 2 turns the bit shift harder or softer..
*/
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input, bit_crush_variable=0;
int counter=0;
unsigned int ADC_low, ADC_high;
 
void setup() {
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(TOGGLE, INPUT_PULLUP); 
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
    //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
     else  digitalWrite(LED, LOW);
  //nothing here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
  // get ADC data
  ADC_low = ADCL; // you need to fetch the low byte first
  ADC_high = ADCH;
  //construct the input sumple summing the ADC low and high byte.
  input = ((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
 
//// All the Digital Signal Processing happens here: ////
 
counter++; //to save resources, the pushbuttons are checked every 10000 times.
if(counter==10000)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_2)) {
  if (bit_crush_variable<16)bit_crush_variable=bit_crush_variable+1; //increase the vol
    digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_1)) {
  if (bit_crush_variable>0)bit_crush_variable=bit_crush_variable-1; //decrease vol
  digitalWrite(LED, LOW); //blinks the led
    }
}
 
  //The bit_crush_variable goes from 0 to 16 and the input signal is crushed in the next instruction:
  input = input<<bit_crush_variable;
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
}

Clean/Transparent эффект

Код ниже - это самый простой код, с которого вы можете начать, чтобы понять процесс «чтения» и записи «аудио». Гитарный сигнал считывается с помощью ADC0, а затем снова воспроизводится с использованием сигнала PWM (контакты PWM9 и PWM10).

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
// clean_pedalshield_uno.ino reads the ADC and plays it back into the PWM output
 
//defining hardware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input, vol_variable=512;
int counter=0;
byte ADC_low, ADC_high;
 
void setup() {
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
  //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
    else  digitalWrite(LED, LOW);
 
  //nothing else here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
  // get ADC data
  ADC_low = ADCL; // you need to fetch the low byte first
  ADC_high = ADCH;
  //construct the input sumple summing the ADC low and high byte.
  input = ((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
 
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
 
}

Daft Punk Octaver эффект

Этот эффект был создан по ошибке 🙂 В итоге получился этот код, который звучит как этот гитарный рифф Daft Punk. Нажатие кнопок позволяет изменить октаву звука вверх или вниз. Как это работает? В основном, - это беспорядок с частотой дискретизации выходного сигнала, который создает эти тона.

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
/* pedalshield_uno_daftpunk_distortion_octaver.ino creates a distortion effect similar to the used 
 * in Television Rules the Nation by Daft Punk. It also octaves the signal up/down presing the pushbuttons
 */
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int counter = 0;
int counter2 = 0;
int input;
int dist_variable=10;
byte ADC_low, ADC_high;
 
 
void setup() {
//setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
}
 
void loop() 
{
  //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
    else  digitalWrite(LED, LOW);
 
  //nothing else here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) {
 
counter++; //to save resources, the pushbuttons are checked every 2000 times.
if(counter==2000)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_1)) {
 
  if (dist_variable<500)dist_variable++;
  digitalWrite(LED, LOW); //blinks the led
 
    }
 
    if (!digitalRead(PUSHBUTTON_2)) {
  if (dist_variable>0)dist_variable--; 
  digitalWrite(LED, LOW); //blinks the led
 
   }
}
 
counter2++;
if(counter2>=dist_variable)
{ 
counter2=0;
 
  // get ADC data
  ADC_low = ADCL; // you need to fetch the low byte first
  ADC_high = ADCH;
  //construct the input sumple summing the ADC low and high byte.
  input = ((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
 
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
 
}
}

Delay

Эффект задержки в Arduno UNO ограничен объемом оперативной памяти. С 2 Кбайт оперативной памяти мы можем хранить до 2048 выборок по 8 бит каждый. С параметрами по умолчанию сигнал PWM генерируется на частоте 33 кГц, а это означает, что каждый сэмпл генерируется каждые 30 мкс (1/33KHz), поэтому с 2 Кбайт памяти мы имеем задержку:

2048 x 30 мкс = 62 мс

62 мс не много, но достаточно, чтобы быть заметным, более похожим на эффект «удвоения».

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
// pedalshield_uno_delay.ino reads the ADC, saves it into the DelayBuffer[] array and plays it into the PWM output.
//  pressing the pushbutton_1 or 2 makes the delay longer or shorter
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input, vol_variable=512;
int counter=0;
unsigned int ADC_low, ADC_high;
 
#define MAX_DELAY 2000
byte DelayBuffer[MAX_DELAY];
unsigned int DelayCounter = 0;
unsigned int Delay_Depth = MAX_DELAY;
 
void setup() {
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(TOGGLE, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
    //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
     else  digitalWrite(LED, LOW);
  //nothing here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
  // get ADC data
  ADC_low = 0; // ADC_low always 0 to save space
  ADC_high = ADCH;
 
  //store the high bit only for 
  DelayBuffer[DelayCounter] = ADC_high;
 
counter++; //to save resources, the pushbuttons are checked every 100 times.
if(counter==100)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_1)) {
  if (Delay_Depth<MAX_DELAY)Delay_Depth=Delay_Depth+1; //increase the vol
    digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_2)) {
  if (Delay_Depth>0)Delay_Depth=Delay_Depth-1; //decrease vol
  digitalWrite(LED, LOW); //blinks the led
    }
}
 
//Increse/reset delay counter.   
  DelayCounter++;
  if(DelayCounter >= Delay_Depth) DelayCounter = 0; 
 
  input = (((DelayBuffer[DelayCounter] << 8) | ADC_low) + 0x8000)+(((ADC_high << 8) | ADC_low) + 0x8000); // make a signed 16b value
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
 
}

Distortion эффект

Этот код считывает сигнал АЦП и фиксирует его до порогового значения, вы можете перемещать этот порог вверх или вниз, нажимая кнопки. Это происходит благодаря:

if (input> distortion_threshold) input = thresholdion_threshold;
// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
// pedalshield_uno_distortion.ino reads the ADC signal and clip it to a threshold value
// pressing the pushbutton_1 or 2 turns the distortion harder or softer.
 
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input, distortion_threshold=6000; //initial value adjusted by try and error.
int counter=0;
unsigned int ADC_low, ADC_high;
 
void setup() {
 
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(TOGGLE, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
    //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
     else  digitalWrite(LED, LOW);
  //nothing here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
  // get ADC data
  ADC_low = ADCL; // you need to fetch the low byte first
  ADC_high = ADCH;
  //construct the input sumple summing the ADC low and high byte.
  input = ((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
 
counter++; //to save resources, the pushbuttons are checked every 1000 times.
if(counter==1000)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_2)) {
  if (distortion_threshold<32768)distortion_threshold=distortion_threshold+25; //increase the vol
    digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_1)) {
  if (distortion_threshold>0)distortion_threshold=distortion_threshold-25; //decrease vol
  digitalWrite(LED, LOW); //blinks the led
    }
}
 
  //the input signal is 16bits (values from -32768 to +32768
  //the valueif(input>distortion_threshold) input=distortion_threshold; is clipped to the distortion_threshold value
    if(input>distortion_threshold) input=distortion_threshold;
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
}

Fuzz Distortion эффект

Этот код похож на эффект Distortion, разница лишь в том, что здесь искажение производится агрессивно:

if (input> distortion_threshold) input = 32768;
else if (input <-distortion_threshold) input = -32768;

Когда входной сигнал достигает порогового значения искажения, сигнал усиливает абсолютную максимальную (или минимальную) шкалу. Вы можете сделать fuzz более твердым или мягким, используя кнопки.

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
// pedalshield_uno_fuzz.ino reads the ADC signal and boost it to the max or min value depending on a threshold value
// pressing the pushbutton_1 or 2 turns the fuzz distortion harder or softer.
 
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input, distortion_threshold=6000; //initial value adjusted by try and error.
int counter=0;
unsigned int ADC_low, ADC_high;
 
void setup() {
 
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(TOGGLE, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
    //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
     else  digitalWrite(LED, LOW);
  //nothing here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
  // get ADC data
  ADC_low = ADCL; // you need to fetch the low byte first
  ADC_high = ADCH;
  //construct the input sumple summing the ADC low and high byte.
  input = ((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
 
counter++; //to save resources, the pushbuttons are checked every 1000 times.
if(counter==1000)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_2)) {
  if (distortion_threshold<32768)distortion_threshold=distortion_threshold+25; //increase the vol
    digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_1)) {
  if (distortion_threshold>0)distortion_threshold=distortion_threshold-25; //decrease vol
  digitalWrite(LED, LOW); //blinks the led
    }
}
 
  //the input signal is 16bits (values from -32768 to +32768
  //the value is clipped to the distortion_threshold value
    if(input>distortion_threshold) input=32768;
    else if(input<-distortion_threshold) input=-32768;
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
}

Metronome

Этот код имитирует метроном, воспроизводящий звуковой сигнал 50 мс вместе со светодиодом. Код очень похож на генератор сигналов, но он включает и отключает перерывы для создания звукового сигнала beep → silence → beep → silence → beep... в основном цикле.

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs and GFB previous works.
// pedalshield_metronome.ino plays a beep (togheter with the LED) like a metronome.
// pressing the pushbutton_1 or 2 changes the speed.
 
const byte waveform[]=
{
0x80,0x80,0x81,0x82,0x83,0x83,0x84,0x85,0x86,0x87,0x87,0x88,0x89,0x8a,0x8a,0x8b,
0x8c,0x8d,0x8e,0x8e,0x8f,0x90,0x91,0x91,0x92,0x93,0x94,0x95,0x95,0x96,0x97,0x98,
0x98,0x99,0x9a,0x9b,0x9b,0x9c,0x9d,0x9e,0x9f,0x9f,0xa0,0xa1,0xa2,0xa2,0xa3,0xa4,
0xa5,0xa5,0xa6,0xa7,0xa8,0xa8,0xa9,0xaa,0xaa,0xab,0xac,0xad,0xad,0xae,0xaf,0xb0,
0xb0,0xb1,0xb2,0xb2,0xb3,0xb4,0xb5,0xb5,0xb6,0xb7,0xb7,0xb8,0xb9,0xba,0xba,0xbb,
0xbc,0xbc,0xbd,0xbe,0xbe,0xbf,0xc0,0xc0,0xc1,0xc2,0xc2,0xc3,0xc4,0xc4,0xc5,0xc6,
0xc6,0xc7,0xc8,0xc8,0xc9,0xca,0xca,0xcb,0xcc,0xcc,0xcd,0xcd,0xce,0xcf,0xcf,0xd0,
0xd0,0xd1,0xd2,0xd2,0xd3,0xd3,0xd4,0xd5,0xd5,0xd6,0xd6,0xd7,0xd7,0xd8,0xd9,0xd9,
0xda,0xda,0xdb,0xdb,0xdc,0xdc,0xdd,0xde,0xde,0xdf,0xdf,0xe0,0xe0,0xe1,0xe1,0xe2,
0xe2,0xe3,0xe3,0xe4,0xe4,0xe5,0xe5,0xe6,0xe6,0xe6,0xe7,0xe7,0xe8,0xe8,0xe9,0xe9,
0xea,0xea,0xea,0xeb,0xeb,0xec,0xec,0xed,0xed,0xed,0xee,0xee,0xef,0xef,0xef,0xf0,
0xf0,0xf0,0xf1,0xf1,0xf1,0xf2,0xf2,0xf2,0xf3,0xf3,0xf3,0xf4,0xf4,0xf4,0xf5,0xf5,
0xf5,0xf6,0xf6,0xf6,0xf7,0xf7,0xf7,0xf7,0xf8,0xf8,0xf8,0xf8,0xf9,0xf9,0xf9,0xf9,
0xfa,0xfa,0xfa,0xfa,0xfa,0xfb,0xfb,0xfb,0xfb,0xfb,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,
0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,
0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,
0xfd,0xfc,0xfc,0xfc,0xfc,0xfc,0xfb,0xfb,0xfb,0xfb,0xfb,0xfb,0xfa,0xfa,0xfa,0xfa,
0xf9,0xf9,0xf9,0xf9,0xf8,0xf8,0xf8,0xf8,0xf7,0xf7,0xf7,0xf7,0xf6,0xf6,0xf6,0xf5,
0xf5,0xf5,0xf5,0xf4,0xf4,0xf4,0xf3,0xf3,0xf3,0xf2,0xf2,0xf2,0xf1,0xf1,0xf1,0xf0,
0xf0,0xef,0xef,0xef,0xee,0xee,0xee,0xed,0xed,0xec,0xec,0xeb,0xeb,0xeb,0xea,0xea,
0xe9,0xe9,0xe8,0xe8,0xe8,0xe7,0xe7,0xe6,0xe6,0xe5,0xe5,0xe4,0xe4,0xe3,0xe3,0xe2,
0xe2,0xe1,0xe1,0xe0,0xe0,0xdf,0xdf,0xde,0xde,0xdd,0xdd,0xdc,0xdc,0xdb,0xdb,0xda,
0xd9,0xd9,0xd8,0xd8,0xd7,0xd7,0xd6,0xd5,0xd5,0xd4,0xd4,0xd3,0xd3,0xd2,0xd1,0xd1,
0xd0,0xd0,0xcf,0xce,0xce,0xcd,0xcc,0xcc,0xcb,0xcb,0xca,0xc9,0xc9,0xc8,0xc7,0xc7,
0xc6,0xc5,0xc5,0xc4,0xc3,0xc3,0xc2,0xc1,0xc1,0xc0,0xbf,0xbf,0xbe,0xbd,0xbd,0xbc,
0xbb,0xbb,0xba,0xb9,0xb9,0xb8,0xb7,0xb6,0xb6,0xb5,0xb4,0xb4,0xb3,0xb2,0xb1,0xb1,
0xb0,0xaf,0xaf,0xae,0xad,0xac,0xac,0xab,0xaa,0xa9,0xa9,0xa8,0xa7,0xa6,0xa6,0xa5,
0xa4,0xa3,0xa3,0xa2,0xa1,0xa0,0xa0,0x9f,0x9e,0x9d,0x9d,0x9c,0x9b,0x9a,0x9a,0x99,
0x98,0x97,0x96,0x96,0x95,0x94,0x93,0x93,0x92,0x91,0x90,0x90,0x8f,0x8e,0x8d,0x8c,
0x8c,0x8b,0x8a,0x89,0x88,0x88,0x87,0x86,0x85,0x85,0x84,0x83,0x82,0x81,0x81,0x80,
0x7f,0x7e,0x7e,0x7d,0x7c,0x7b,0x7a,0x7a,0x79,0x78,0x77,0x77,0x76,0x75,0x74,0x73,
0x73,0x72,0x71,0x70,0x6f,0x6f,0x6e,0x6d,0x6c,0x6c,0x6b,0x6a,0x69,0x69,0x68,0x67,
0x66,0x65,0x65,0x64,0x63,0x62,0x62,0x61,0x60,0x5f,0x5f,0x5e,0x5d,0x5c,0x5c,0x5b,
0x5a,0x59,0x59,0x58,0x57,0x56,0x56,0x55,0x54,0x53,0x53,0x52,0x51,0x50,0x50,0x4f,
0x4e,0x4e,0x4d,0x4c,0x4b,0x4b,0x4a,0x49,0x49,0x48,0x47,0x46,0x46,0x45,0x44,0x44,
0x43,0x42,0x42,0x41,0x40,0x40,0x3f,0x3e,0x3e,0x3d,0x3c,0x3c,0x3b,0x3a,0x3a,0x39,
0x38,0x38,0x37,0x36,0x36,0x35,0x34,0x34,0x33,0x33,0x32,0x31,0x31,0x30,0x2f,0x2f,
0x2e,0x2e,0x2d,0x2c,0x2c,0x2b,0x2b,0x2a,0x2a,0x29,0x28,0x28,0x27,0x27,0x26,0x26,
0x25,0x24,0x24,0x23,0x23,0x22,0x22,0x21,0x21,0x20,0x20,0x1f,0x1f,0x1e,0x1e,0x1d,
0x1d,0x1c,0x1c,0x1b,0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x17,0x16,0x16,
0x15,0x15,0x14,0x14,0x14,0x13,0x13,0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0xf,
0xf,0xe,0xe,0xe,0xd,0xd,0xd,0xc,0xc,0xc,0xb,0xb,0xb,0xa,0xa,0xa,
0xa,0x9,0x9,0x9,0x8,0x8,0x8,0x8,0x7,0x7,0x7,0x7,0x6,0x6,0x6,0x6,
0x5,0x5,0x5,0x5,0x4,0x4,0x4,0x4,0x4,0x4,0x3,0x3,0x3,0x3,0x3,0x2,
0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x2,0x2,0x2,0x2,0x2,0x2,0x2,
0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x4,0x4,0x4,0x4,0x5,0x5,0x5,0x5,0x5,
0x6,0x6,0x6,0x6,0x7,0x7,0x7,0x7,0x8,0x8,0x8,0x8,0x9,0x9,0x9,0xa,
0xa,0xa,0xb,0xb,0xb,0xc,0xc,0xc,0xd,0xd,0xd,0xe,0xe,0xe,0xf,0xf,
0xf,0x10,0x10,0x10,0x11,0x11,0x12,0x12,0x12,0x13,0x13,0x14,0x14,0x15,0x15,0x15,
0x16,0x16,0x17,0x17,0x18,0x18,0x19,0x19,0x19,0x1a,0x1a,0x1b,0x1b,0x1c,0x1c,0x1d,
0x1d,0x1e,0x1e,0x1f,0x1f,0x20,0x20,0x21,0x21,0x22,0x23,0x23,0x24,0x24,0x25,0x25,
0x26,0x26,0x27,0x28,0x28,0x29,0x29,0x2a,0x2a,0x2b,0x2c,0x2c,0x2d,0x2d,0x2e,0x2f,
0x2f,0x30,0x30,0x31,0x32,0x32,0x33,0x33,0x34,0x35,0x35,0x36,0x37,0x37,0x38,0x39,
0x39,0x3a,0x3b,0x3b,0x3c,0x3d,0x3d,0x3e,0x3f,0x3f,0x40,0x41,0x41,0x42,0x43,0x43,
0x44,0x45,0x45,0x46,0x47,0x48,0x48,0x49,0x4a,0x4a,0x4b,0x4c,0x4d,0x4d,0x4e,0x4f,
0x4f,0x50,0x51,0x52,0x52,0x53,0x54,0x55,0x55,0x56,0x57,0x57,0x58,0x59,0x5a,0x5a,
0x5b,0x5c,0x5d,0x5d,0x5e,0x5f,0x60,0x60,0x61,0x62,0x63,0x64,0x64,0x65,0x66,0x67,
0x67,0x68,0x69,0x6a,0x6a,0x6b,0x6c,0x6d,0x6e,0x6e,0x6f,0x70,0x71,0x71,0x72,0x73,
0x74,0x75,0x75,0x76,0x77,0x78,0x78,0x79,0x7a,0x7b,0x7c,0x7c,0x7d,0x7e,0x7f,0x80,
};
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input; 
long delay_time=20000;
int counter=0;
int sample=0;
 
void setup() {
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(TOGGLE, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
 
//BEEP PART: Enable Interruption which makes the sinewave.   
digitalWrite(LED, HIGH); 
sei(); // turn on interrupts - not really necessary with arduino  
delay(50); //the beep has a constant time of 50ms.
 
//SILENT PART: Disabling Interruption which makes the sinewave.
digitalWrite(LED, LOW); 
cli();
//IC_DisableIRQ(TC4_IRQn);
 
sample=0;
delay(delay_time);
 
}
 
ISR(TIMER1_CAPT_vect) 
{
 
counter++; //to save resources, the pushbuttons are checked every 100 times.
if(counter==1000)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_1)) {
  if (delay_time<2000000)delay_time=delay_time+1000; //increase the vol
 //   digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_2)) {
  if (delay_time>600)delay_time=delay_time-1000; //decrease vol
//  digitalWrite(LED, LOW); //blinks the led
    }
}
 
input = waveform[sample];//((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
sample=sample+20;
if(sample>=1023)sample=0;
 
  //write the PWM signal
 OCR1AL =waveform[sample];
 OCR1BL = waveform[sample];
}

Signal Generator

Этот код хранит в памяти один цикл синусоидальной формы волны (переменной байтовой формы []), а затем воспроизводит его в цикле, создавая сигнал. Вы можете изменить частоту формы волны, нажав на кнопки на модуле, это заставит указатель двигаться вперед увеличивая воспринимаемую частоту. Разные варианты вы можете найти после кода.

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs and GFB previous works.
// pedalshield_uno_signal_generator.ino plays a waveform stores in memory (waveform[])
// pressing the pushbutton_1 or 2 changes the frequency.
 
 
const byte waveform[]=
{0x80,0x80,0x81,0x82,0x83,0x83,0x84,0x85,0x86,0x87,0x87,0x88,0x89,0x8a,0x8a,0x8b,
0x8c,0x8d,0x8e,0x8e,0x8f,0x90,0x91,0x91,0x92,0x93,0x94,0x95,0x95,0x96,0x97,0x98,
0x98,0x99,0x9a,0x9b,0x9b,0x9c,0x9d,0x9e,0x9f,0x9f,0xa0,0xa1,0xa2,0xa2,0xa3,0xa4,
0xa5,0xa5,0xa6,0xa7,0xa8,0xa8,0xa9,0xaa,0xaa,0xab,0xac,0xad,0xad,0xae,0xaf,0xb0,
0xb0,0xb1,0xb2,0xb2,0xb3,0xb4,0xb5,0xb5,0xb6,0xb7,0xb7,0xb8,0xb9,0xba,0xba,0xbb,
0xbc,0xbc,0xbd,0xbe,0xbe,0xbf,0xc0,0xc0,0xc1,0xc2,0xc2,0xc3,0xc4,0xc4,0xc5,0xc6,
0xc6,0xc7,0xc8,0xc8,0xc9,0xca,0xca,0xcb,0xcc,0xcc,0xcd,0xcd,0xce,0xcf,0xcf,0xd0,
0xd0,0xd1,0xd2,0xd2,0xd3,0xd3,0xd4,0xd5,0xd5,0xd6,0xd6,0xd7,0xd7,0xd8,0xd9,0xd9,
0xda,0xda,0xdb,0xdb,0xdc,0xdc,0xdd,0xde,0xde,0xdf,0xdf,0xe0,0xe0,0xe1,0xe1,0xe2,
0xe2,0xe3,0xe3,0xe4,0xe4,0xe5,0xe5,0xe6,0xe6,0xe6,0xe7,0xe7,0xe8,0xe8,0xe9,0xe9,
0xea,0xea,0xea,0xeb,0xeb,0xec,0xec,0xed,0xed,0xed,0xee,0xee,0xef,0xef,0xef,0xf0,
0xf0,0xf0,0xf1,0xf1,0xf1,0xf2,0xf2,0xf2,0xf3,0xf3,0xf3,0xf4,0xf4,0xf4,0xf5,0xf5,
0xf5,0xf6,0xf6,0xf6,0xf7,0xf7,0xf7,0xf7,0xf8,0xf8,0xf8,0xf8,0xf9,0xf9,0xf9,0xf9,
0xfa,0xfa,0xfa,0xfa,0xfa,0xfb,0xfb,0xfb,0xfb,0xfb,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,
0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,
0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,
0xfd,0xfc,0xfc,0xfc,0xfc,0xfc,0xfb,0xfb,0xfb,0xfb,0xfb,0xfb,0xfa,0xfa,0xfa,0xfa,
0xf9,0xf9,0xf9,0xf9,0xf8,0xf8,0xf8,0xf8,0xf7,0xf7,0xf7,0xf7,0xf6,0xf6,0xf6,0xf5,
0xf5,0xf5,0xf5,0xf4,0xf4,0xf4,0xf3,0xf3,0xf3,0xf2,0xf2,0xf2,0xf1,0xf1,0xf1,0xf0,
0xf0,0xef,0xef,0xef,0xee,0xee,0xee,0xed,0xed,0xec,0xec,0xeb,0xeb,0xeb,0xea,0xea,
0xe9,0xe9,0xe8,0xe8,0xe8,0xe7,0xe7,0xe6,0xe6,0xe5,0xe5,0xe4,0xe4,0xe3,0xe3,0xe2,
0xe2,0xe1,0xe1,0xe0,0xe0,0xdf,0xdf,0xde,0xde,0xdd,0xdd,0xdc,0xdc,0xdb,0xdb,0xda,
0xd9,0xd9,0xd8,0xd8,0xd7,0xd7,0xd6,0xd5,0xd5,0xd4,0xd4,0xd3,0xd3,0xd2,0xd1,0xd1,
0xd0,0xd0,0xcf,0xce,0xce,0xcd,0xcc,0xcc,0xcb,0xcb,0xca,0xc9,0xc9,0xc8,0xc7,0xc7,
0xc6,0xc5,0xc5,0xc4,0xc3,0xc3,0xc2,0xc1,0xc1,0xc0,0xbf,0xbf,0xbe,0xbd,0xbd,0xbc,
0xbb,0xbb,0xba,0xb9,0xb9,0xb8,0xb7,0xb6,0xb6,0xb5,0xb4,0xb4,0xb3,0xb2,0xb1,0xb1,
0xb0,0xaf,0xaf,0xae,0xad,0xac,0xac,0xab,0xaa,0xa9,0xa9,0xa8,0xa7,0xa6,0xa6,0xa5,
0xa4,0xa3,0xa3,0xa2,0xa1,0xa0,0xa0,0x9f,0x9e,0x9d,0x9d,0x9c,0x9b,0x9a,0x9a,0x99,
0x98,0x97,0x96,0x96,0x95,0x94,0x93,0x93,0x92,0x91,0x90,0x90,0x8f,0x8e,0x8d,0x8c,
0x8c,0x8b,0x8a,0x89,0x88,0x88,0x87,0x86,0x85,0x85,0x84,0x83,0x82,0x81,0x81,0x80,
0x7f,0x7e,0x7e,0x7d,0x7c,0x7b,0x7a,0x7a,0x79,0x78,0x77,0x77,0x76,0x75,0x74,0x73,
0x73,0x72,0x71,0x70,0x6f,0x6f,0x6e,0x6d,0x6c,0x6c,0x6b,0x6a,0x69,0x69,0x68,0x67,
0x66,0x65,0x65,0x64,0x63,0x62,0x62,0x61,0x60,0x5f,0x5f,0x5e,0x5d,0x5c,0x5c,0x5b,
0x5a,0x59,0x59,0x58,0x57,0x56,0x56,0x55,0x54,0x53,0x53,0x52,0x51,0x50,0x50,0x4f,
0x4e,0x4e,0x4d,0x4c,0x4b,0x4b,0x4a,0x49,0x49,0x48,0x47,0x46,0x46,0x45,0x44,0x44,
0x43,0x42,0x42,0x41,0x40,0x40,0x3f,0x3e,0x3e,0x3d,0x3c,0x3c,0x3b,0x3a,0x3a,0x39,
0x38,0x38,0x37,0x36,0x36,0x35,0x34,0x34,0x33,0x33,0x32,0x31,0x31,0x30,0x2f,0x2f,
0x2e,0x2e,0x2d,0x2c,0x2c,0x2b,0x2b,0x2a,0x2a,0x29,0x28,0x28,0x27,0x27,0x26,0x26,
0x25,0x24,0x24,0x23,0x23,0x22,0x22,0x21,0x21,0x20,0x20,0x1f,0x1f,0x1e,0x1e,0x1d,
0x1d,0x1c,0x1c,0x1b,0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x17,0x16,0x16,
0x15,0x15,0x14,0x14,0x14,0x13,0x13,0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0xf,
0xf,0xe,0xe,0xe,0xd,0xd,0xd,0xc,0xc,0xc,0xb,0xb,0xb,0xa,0xa,0xa,
0xa,0x9,0x9,0x9,0x8,0x8,0x8,0x8,0x7,0x7,0x7,0x7,0x6,0x6,0x6,0x6,
0x5,0x5,0x5,0x5,0x4,0x4,0x4,0x4,0x4,0x4,0x3,0x3,0x3,0x3,0x3,0x2,
0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x2,0x2,0x2,0x2,0x2,0x2,0x2,
0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x4,0x4,0x4,0x4,0x5,0x5,0x5,0x5,0x5,
0x6,0x6,0x6,0x6,0x7,0x7,0x7,0x7,0x8,0x8,0x8,0x8,0x9,0x9,0x9,0xa,
0xa,0xa,0xb,0xb,0xb,0xc,0xc,0xc,0xd,0xd,0xd,0xe,0xe,0xe,0xf,0xf,
0xf,0x10,0x10,0x10,0x11,0x11,0x12,0x12,0x12,0x13,0x13,0x14,0x14,0x15,0x15,0x15,
0x16,0x16,0x17,0x17,0x18,0x18,0x19,0x19,0x19,0x1a,0x1a,0x1b,0x1b,0x1c,0x1c,0x1d,
0x1d,0x1e,0x1e,0x1f,0x1f,0x20,0x20,0x21,0x21,0x22,0x23,0x23,0x24,0x24,0x25,0x25,
0x26,0x26,0x27,0x28,0x28,0x29,0x29,0x2a,0x2a,0x2b,0x2c,0x2c,0x2d,0x2d,0x2e,0x2f,
0x2f,0x30,0x30,0x31,0x32,0x32,0x33,0x33,0x34,0x35,0x35,0x36,0x37,0x37,0x38,0x39,
0x39,0x3a,0x3b,0x3b,0x3c,0x3d,0x3d,0x3e,0x3f,0x3f,0x40,0x41,0x41,0x42,0x43,0x43,
0x44,0x45,0x45,0x46,0x47,0x48,0x48,0x49,0x4a,0x4a,0x4b,0x4c,0x4d,0x4d,0x4e,0x4f,
0x4f,0x50,0x51,0x52,0x52,0x53,0x54,0x55,0x55,0x56,0x57,0x57,0x58,0x59,0x5a,0x5a,
0x5b,0x5c,0x5d,0x5d,0x5e,0x5f,0x60,0x60,0x61,0x62,0x63,0x64,0x64,0x65,0x66,0x67,
0x67,0x68,0x69,0x6a,0x6a,0x6b,0x6c,0x6d,0x6e,0x6e,0x6f,0x70,0x71,0x71,0x72,0x73,
0x74,0x75,0x75,0x76,0x77,0x78,0x78,0x79,0x7a,0x7b,0x7c,0x7c,0x7d,0x7e,0x7f,0x80,
};
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input,inputa,inputb, speed=1;
int counter=0;
int sample=0;
 
void setup() {
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(TOGGLE, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
  //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
    else  digitalWrite(LED, LOW);
 
  //nothing else here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
 
counter++; //to save resources, the pushbuttons are checked every 5000 times.
if(counter==5000)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_2)) {
  if (speed<1024)speed=speed+1; //increase the vol
    digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_1)) {
  if (speed>0)speed=speed-1; //decrease vol
  digitalWrite(LED, LOW); //blinks the led
    }
}
 
input = waveform[sample];
 
sample=sample+speed;
if(sample>1023)sample=0;
 
  //write the PWM signal
 OCR1AL =waveform[sample];// (((input + 0x08000)) >> 8); // convert to unsigned, send out high byte
 OCR1BL = waveform[sample]; // send out low byte
}

Есть несколько вариантов, которые вы можете загрузить в переменную waveform [] для создания других осциллограмм:

синусоидальный:

0x80,0x80,0x81,0x82,0x83,0x83,0x84,0x85,0x86,0x87,0x87,0x88,0x89,0x8a,0x8a,0x8b,
0x8c,0x8d,0x8e,0x8e,0x8f,0x90,0x91,0x91,0x92,0x93,0x94,0x95,0x95,0x96,0x97,0x98,
0x98,0x99,0x9a,0x9b,0x9b,0x9c,0x9d,0x9e,0x9f,0x9f,0xa0,0xa1,0xa2,0xa2,0xa3,0xa4,
0xa5,0xa5,0xa6,0xa7,0xa8,0xa8,0xa9,0xaa,0xaa,0xab,0xac,0xad,0xad,0xae,0xaf,0xb0,
0xb0,0xb1,0xb2,0xb2,0xb3,0xb4,0xb5,0xb5,0xb6,0xb7,0xb7,0xb8,0xb9,0xba,0xba,0xbb,
0xbc,0xbc,0xbd,0xbe,0xbe,0xbf,0xc0,0xc0,0xc1,0xc2,0xc2,0xc3,0xc4,0xc4,0xc5,0xc6,
0xc6,0xc7,0xc8,0xc8,0xc9,0xca,0xca,0xcb,0xcc,0xcc,0xcd,0xcd,0xce,0xcf,0xcf,0xd0,
0xd0,0xd1,0xd2,0xd2,0xd3,0xd3,0xd4,0xd5,0xd5,0xd6,0xd6,0xd7,0xd7,0xd8,0xd9,0xd9,
0xda,0xda,0xdb,0xdb,0xdc,0xdc,0xdd,0xde,0xde,0xdf,0xdf,0xe0,0xe0,0xe1,0xe1,0xe2,
0xe2,0xe3,0xe3,0xe4,0xe4,0xe5,0xe5,0xe6,0xe6,0xe6,0xe7,0xe7,0xe8,0xe8,0xe9,0xe9,
0xea,0xea,0xea,0xeb,0xeb,0xec,0xec,0xed,0xed,0xed,0xee,0xee,0xef,0xef,0xef,0xf0,
0xf0,0xf0,0xf1,0xf1,0xf1,0xf2,0xf2,0xf2,0xf3,0xf3,0xf3,0xf4,0xf4,0xf4,0xf5,0xf5,
0xf5,0xf6,0xf6,0xf6,0xf7,0xf7,0xf7,0xf7,0xf8,0xf8,0xf8,0xf8,0xf9,0xf9,0xf9,0xf9,
0xfa,0xfa,0xfa,0xfa,0xfa,0xfb,0xfb,0xfb,0xfb,0xfb,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,
0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,
0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,
0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,
0xfd,0xfc,0xfc,0xfc,0xfc,0xfc,0xfb,0xfb,0xfb,0xfb,0xfb,0xfb,0xfa,0xfa,0xfa,0xfa,
0xf9,0xf9,0xf9,0xf9,0xf8,0xf8,0xf8,0xf8,0xf7,0xf7,0xf7,0xf7,0xf6,0xf6,0xf6,0xf5,
0xf5,0xf5,0xf5,0xf4,0xf4,0xf4,0xf3,0xf3,0xf3,0xf2,0xf2,0xf2,0xf1,0xf1,0xf1,0xf0,
0xf0,0xef,0xef,0xef,0xee,0xee,0xee,0xed,0xed,0xec,0xec,0xeb,0xeb,0xeb,0xea,0xea,
0xe9,0xe9,0xe8,0xe8,0xe8,0xe7,0xe7,0xe6,0xe6,0xe5,0xe5,0xe4,0xe4,0xe3,0xe3,0xe2,
0xe2,0xe1,0xe1,0xe0,0xe0,0xdf,0xdf,0xde,0xde,0xdd,0xdd,0xdc,0xdc,0xdb,0xdb,0xda,
0xd9,0xd9,0xd8,0xd8,0xd7,0xd7,0xd6,0xd5,0xd5,0xd4,0xd4,0xd3,0xd3,0xd2,0xd1,0xd1,
0xd0,0xd0,0xcf,0xce,0xce,0xcd,0xcc,0xcc,0xcb,0xcb,0xca,0xc9,0xc9,0xc8,0xc7,0xc7,
0xc6,0xc5,0xc5,0xc4,0xc3,0xc3,0xc2,0xc1,0xc1,0xc0,0xbf,0xbf,0xbe,0xbd,0xbd,0xbc,
0xbb,0xbb,0xba,0xb9,0xb9,0xb8,0xb7,0xb6,0xb6,0xb5,0xb4,0xb4,0xb3,0xb2,0xb1,0xb1,
0xb0,0xaf,0xaf,0xae,0xad,0xac,0xac,0xab,0xaa,0xa9,0xa9,0xa8,0xa7,0xa6,0xa6,0xa5,
0xa4,0xa3,0xa3,0xa2,0xa1,0xa0,0xa0,0x9f,0x9e,0x9d,0x9d,0x9c,0x9b,0x9a,0x9a,0x99,
0x98,0x97,0x96,0x96,0x95,0x94,0x93,0x93,0x92,0x91,0x90,0x90,0x8f,0x8e,0x8d,0x8c,
0x8c,0x8b,0x8a,0x89,0x88,0x88,0x87,0x86,0x85,0x85,0x84,0x83,0x82,0x81,0x81,0x80,
0x7f,0x7e,0x7e,0x7d,0x7c,0x7b,0x7a,0x7a,0x79,0x78,0x77,0x77,0x76,0x75,0x74,0x73,
0x73,0x72,0x71,0x70,0x6f,0x6f,0x6e,0x6d,0x6c,0x6c,0x6b,0x6a,0x69,0x69,0x68,0x67,
0x66,0x65,0x65,0x64,0x63,0x62,0x62,0x61,0x60,0x5f,0x5f,0x5e,0x5d,0x5c,0x5c,0x5b,
0x5a,0x59,0x59,0x58,0x57,0x56,0x56,0x55,0x54,0x53,0x53,0x52,0x51,0x50,0x50,0x4f,
0x4e,0x4e,0x4d,0x4c,0x4b,0x4b,0x4a,0x49,0x49,0x48,0x47,0x46,0x46,0x45,0x44,0x44,
0x43,0x42,0x42,0x41,0x40,0x40,0x3f,0x3e,0x3e,0x3d,0x3c,0x3c,0x3b,0x3a,0x3a,0x39,
0x38,0x38,0x37,0x36,0x36,0x35,0x34,0x34,0x33,0x33,0x32,0x31,0x31,0x30,0x2f,0x2f,
0x2e,0x2e,0x2d,0x2c,0x2c,0x2b,0x2b,0x2a,0x2a,0x29,0x28,0x28,0x27,0x27,0x26,0x26,
0x25,0x24,0x24,0x23,0x23,0x22,0x22,0x21,0x21,0x20,0x20,0x1f,0x1f,0x1e,0x1e,0x1d,
0x1d,0x1c,0x1c,0x1b,0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x17,0x16,0x16,
0x15,0x15,0x14,0x14,0x14,0x13,0x13,0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0xf,
0xf,0xe,0xe,0xe,0xd,0xd,0xd,0xc,0xc,0xc,0xb,0xb,0xb,0xa,0xa,0xa,
0xa,0x9,0x9,0x9,0x8,0x8,0x8,0x8,0x7,0x7,0x7,0x7,0x6,0x6,0x6,0x6,
0x5,0x5,0x5,0x5,0x4,0x4,0x4,0x4,0x4,0x4,0x3,0x3,0x3,0x3,0x3,0x2,
0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x2,0x2,0x2,0x2,0x2,0x2,0x2,
0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x4,0x4,0x4,0x4,0x5,0x5,0x5,0x5,0x5,
0x6,0x6,0x6,0x6,0x7,0x7,0x7,0x7,0x8,0x8,0x8,0x8,0x9,0x9,0x9,0xa,
0xa,0xa,0xb,0xb,0xb,0xc,0xc,0xc,0xd,0xd,0xd,0xe,0xe,0xe,0xf,0xf,
0xf,0x10,0x10,0x10,0x11,0x11,0x12,0x12,0x12,0x13,0x13,0x14,0x14,0x15,0x15,0x15,
0x16,0x16,0x17,0x17,0x18,0x18,0x19,0x19,0x19,0x1a,0x1a,0x1b,0x1b,0x1c,0x1c,0x1d,
0x1d,0x1e,0x1e,0x1f,0x1f,0x20,0x20,0x21,0x21,0x22,0x23,0x23,0x24,0x24,0x25,0x25,
0x26,0x26,0x27,0x28,0x28,0x29,0x29,0x2a,0x2a,0x2b,0x2c,0x2c,0x2d,0x2d,0x2e,0x2f,
0x2f,0x30,0x30,0x31,0x32,0x32,0x33,0x33,0x34,0x35,0x35,0x36,0x37,0x37,0x38,0x39,
0x39,0x3a,0x3b,0x3b,0x3c,0x3d,0x3d,0x3e,0x3f,0x3f,0x40,0x41,0x41,0x42,0x43,0x43,
0x44,0x45,0x45,0x46,0x47,0x48,0x48,0x49,0x4a,0x4a,0x4b,0x4c,0x4d,0x4d,0x4e,0x4f,
0x4f,0x50,0x51,0x52,0x52,0x53,0x54,0x55,0x55,0x56,0x57,0x57,0x58,0x59,0x5a,0x5a,
0x5b,0x5c,0x5d,0x5d,0x5e,0x5f,0x60,0x60,0x61,0x62,0x63,0x64,0x64,0x65,0x66,0x67,
0x67,0x68,0x69,0x6a,0x6a,0x6b,0x6c,0x6d,0x6e,0x6e,0x6f,0x70,0x71,0x71,0x72,0x73,
0x74,0x75,0x75,0x76,0x77,0x78,0x78,0x79,0x7a,0x7b,0x7c,0x7c,0x7d,0x7e,0x7f,0x80,

треугольный:

0x0,0x1,0x1,0x2,0x2,0x3,0x3,0x4,0x4,0x5,0x5,0x6,0x6,0x7,0x7,0x8,
0x8,0x9,0x9,0xa,0xa,0xb,0xb,0xc,0xc,0xd,0xd,0xe,0xe,0xf,0xf,0x10,
0x10,0x11,0x11,0x12,0x12,0x13,0x13,0x14,0x14,0x15,0x15,0x16,0x16,0x17,0x17,0x18,
0x18,0x19,0x19,0x1a,0x1a,0x1b,0x1b,0x1c,0x1c,0x1d,0x1d,0x1e,0x1e,0x1f,0x1f,0x20,
0x20,0x21,0x21,0x22,0x22,0x23,0x23,0x24,0x24,0x25,0x25,0x26,0x26,0x27,0x27,0x28,
0x28,0x29,0x29,0x2a,0x2a,0x2b,0x2b,0x2c,0x2c,0x2d,0x2d,0x2e,0x2e,0x2f,0x2f,0x30,
0x30,0x31,0x31,0x32,0x32,0x33,0x33,0x34,0x34,0x35,0x35,0x36,0x36,0x37,0x37,0x38,
0x38,0x39,0x39,0x3a,0x3a,0x3b,0x3b,0x3c,0x3c,0x3d,0x3d,0x3e,0x3e,0x3f,0x3f,0x40,
0x40,0x41,0x41,0x42,0x42,0x43,0x43,0x44,0x44,0x45,0x45,0x46,0x46,0x47,0x47,0x48,
0x48,0x49,0x49,0x4a,0x4a,0x4b,0x4b,0x4c,0x4c,0x4d,0x4d,0x4e,0x4e,0x4f,0x4f,0x50,
0x50,0x51,0x51,0x52,0x52,0x53,0x53,0x54,0x54,0x55,0x55,0x56,0x56,0x57,0x57,0x58,
0x58,0x59,0x59,0x5a,0x5a,0x5b,0x5b,0x5c,0x5c,0x5d,0x5d,0x5e,0x5e,0x5f,0x5f,0x60,
0x60,0x61,0x61,0x62,0x62,0x63,0x63,0x64,0x64,0x65,0x65,0x66,0x66,0x67,0x67,0x68,
0x68,0x69,0x69,0x6a,0x6a,0x6b,0x6b,0x6c,0x6c,0x6d,0x6d,0x6e,0x6e,0x6f,0x6f,0x70,
0x70,0x71,0x71,0x72,0x72,0x73,0x73,0x74,0x74,0x75,0x75,0x76,0x76,0x77,0x77,0x78,
0x78,0x79,0x79,0x7a,0x7a,0x7b,0x7b,0x7c,0x7c,0x7d,0x7d,0x7e,0x7e,0x7f,0x7f,0x80,
0x80,0x81,0x81,0x82,0x82,0x83,0x83,0x84,0x84,0x85,0x85,0x86,0x86,0x87,0x87,0x88,
0x88,0x89,0x89,0x8a,0x8a,0x8b,0x8b,0x8c,0x8c,0x8d,0x8d,0x8e,0x8e,0x8f,0x8f,0x90,
0x90,0x91,0x91,0x92,0x92,0x93,0x93,0x94,0x94,0x95,0x95,0x96,0x96,0x97,0x97,0x98,
0x98,0x99,0x99,0x9a,0x9a,0x9b,0x9b,0x9c,0x9c,0x9d,0x9d,0x9e,0x9e,0x9f,0x9f,0xa0,
0xa0,0xa1,0xa1,0xa2,0xa2,0xa3,0xa3,0xa4,0xa4,0xa5,0xa5,0xa6,0xa6,0xa7,0xa7,0xa8,
0xa8,0xa9,0xa9,0xaa,0xaa,0xaa,0xab,0xab,0xac,0xac,0xad,0xad,0xae,0xae,0xaf,0xaf,
0xb0,0xb0,0xb1,0xb1,0xb2,0xb2,0xb3,0xb3,0xb4,0xb4,0xb5,0xb5,0xb6,0xb6,0xb7,0xb7,
0xb8,0xb8,0xb9,0xb9,0xba,0xba,0xbb,0xbb,0xbc,0xbc,0xbd,0xbd,0xbe,0xbe,0xbf,0xbf,
0xc0,0xc0,0xc1,0xc1,0xc2,0xc2,0xc3,0xc3,0xc4,0xc4,0xc5,0xc5,0xc6,0xc6,0xc7,0xc7,
0xc8,0xc8,0xc9,0xc9,0xca,0xca,0xcb,0xcb,0xcc,0xcc,0xcd,0xcd,0xce,0xce,0xcf,0xcf,
0xd0,0xd0,0xd1,0xd1,0xd2,0xd2,0xd3,0xd3,0xd4,0xd4,0xd5,0xd5,0xd6,0xd6,0xd7,0xd7,
0xd8,0xd8,0xd9,0xd9,0xda,0xda,0xdb,0xdb,0xdc,0xdc,0xdd,0xdd,0xde,0xde,0xdf,0xdf,
0xe0,0xe0,0xe1,0xe1,0xe2,0xe2,0xe3,0xe3,0xe4,0xe4,0xe5,0xe5,0xe6,0xe6,0xe7,0xe7,
0xe8,0xe8,0xe9,0xe9,0xea,0xea,0xeb,0xeb,0xec,0xec,0xed,0xed,0xee,0xee,0xef,0xef,
0xf0,0xf0,0xf1,0xf1,0xf2,0xf2,0xf3,0xf3,0xf4,0xf4,0xf5,0xf5,0xf6,0xf6,0xf7,0xf7,
0xf8,0xf8,0xf9,0xf9,0xfa,0xfa,0xfb,0xfb,0xfc,0xfc,0xfd,0xfd,0xfe,0xfe,0xff,0xff,
0xff,0xfe,0xfe,0xfd,0xfd,0xfc,0xfc,0xfb,0xfb,0xfa,0xfa,0xf9,0xf9,0xf8,0xf8,0xf7,
0xf7,0xf6,0xf6,0xf5,0xf5,0xf4,0xf4,0xf3,0xf3,0xf2,0xf2,0xf1,0xf1,0xf0,0xf0,0xef,
0xef,0xee,0xee,0xed,0xed,0xec,0xec,0xeb,0xeb,0xea,0xea,0xe9,0xe9,0xe8,0xe8,0xe7,
0xe7,0xe6,0xe6,0xe5,0xe5,0xe4,0xe4,0xe3,0xe3,0xe2,0xe2,0xe1,0xe1,0xe0,0xe0,0xdf,
0xdf,0xde,0xde,0xdd,0xdd,0xdc,0xdc,0xdb,0xdb,0xda,0xda,0xd9,0xd9,0xd8,0xd8,0xd7,
0xd7,0xd6,0xd6,0xd5,0xd5,0xd4,0xd4,0xd3,0xd3,0xd2,0xd2,0xd1,0xd1,0xd0,0xd0,0xcf,
0xcf,0xce,0xce,0xcd,0xcd,0xcc,0xcc,0xcb,0xcb,0xca,0xca,0xc9,0xc9,0xc8,0xc8,0xc7,
0xc7,0xc6,0xc6,0xc5,0xc5,0xc4,0xc4,0xc3,0xc3,0xc2,0xc2,0xc1,0xc1,0xc0,0xc0,0xbf,
0xbf,0xbe,0xbe,0xbd,0xbd,0xbc,0xbc,0xbb,0xbb,0xba,0xba,0xb9,0xb9,0xb8,0xb8,0xb7,
0xb7,0xb6,0xb6,0xb5,0xb5,0xb4,0xb4,0xb3,0xb3,0xb2,0xb2,0xb1,0xb1,0xb0,0xb0,0xaf,
0xaf,0xae,0xae,0xad,0xad,0xac,0xac,0xab,0xab,0xaa,0xaa,0xaa,0xa9,0xa9,0xa8,0xa8,
0xa7,0xa7,0xa6,0xa6,0xa5,0xa5,0xa4,0xa4,0xa3,0xa3,0xa2,0xa2,0xa1,0xa1,0xa0,0xa0,
0x9f,0x9f,0x9e,0x9e,0x9d,0x9d,0x9c,0x9c,0x9b,0x9b,0x9a,0x9a,0x99,0x99,0x98,0x98,
0x97,0x97,0x96,0x96,0x95,0x95,0x94,0x94,0x93,0x93,0x92,0x92,0x91,0x91,0x90,0x90,
0x8f,0x8f,0x8e,0x8e,0x8d,0x8d,0x8c,0x8c,0x8b,0x8b,0x8a,0x8a,0x89,0x89,0x88,0x88,
0x87,0x87,0x86,0x86,0x85,0x85,0x84,0x84,0x83,0x83,0x82,0x82,0x81,0x81,0x80,0x80,
0x7f,0x7f,0x7e,0x7e,0x7d,0x7d,0x7c,0x7c,0x7b,0x7b,0x7a,0x7a,0x79,0x79,0x78,0x78,
0x77,0x77,0x76,0x76,0x75,0x75,0x74,0x74,0x73,0x73,0x72,0x72,0x71,0x71,0x70,0x70,
0x6f,0x6f,0x6e,0x6e,0x6d,0x6d,0x6c,0x6c,0x6b,0x6b,0x6a,0x6a,0x69,0x69,0x68,0x68,
0x67,0x67,0x66,0x66,0x65,0x65,0x64,0x64,0x63,0x63,0x62,0x62,0x61,0x61,0x60,0x60,
0x5f,0x5f,0x5e,0x5e,0x5d,0x5d,0x5c,0x5c,0x5b,0x5b,0x5a,0x5a,0x59,0x59,0x58,0x58,
0x57,0x57,0x56,0x56,0x55,0x55,0x54,0x54,0x53,0x53,0x52,0x52,0x51,0x51,0x50,0x50,
0x4f,0x4f,0x4e,0x4e,0x4d,0x4d,0x4c,0x4c,0x4b,0x4b,0x4a,0x4a,0x49,0x49,0x48,0x48,
0x47,0x47,0x46,0x46,0x45,0x45,0x44,0x44,0x43,0x43,0x42,0x42,0x41,0x41,0x40,0x40,
0x3f,0x3f,0x3e,0x3e,0x3d,0x3d,0x3c,0x3c,0x3b,0x3b,0x3a,0x3a,0x39,0x39,0x38,0x38,
0x37,0x37,0x36,0x36,0x35,0x35,0x34,0x34,0x33,0x33,0x32,0x32,0x31,0x31,0x30,0x30,
0x2f,0x2f,0x2e,0x2e,0x2d,0x2d,0x2c,0x2c,0x2b,0x2b,0x2a,0x2a,0x29,0x29,0x28,0x28,
0x27,0x27,0x26,0x26,0x25,0x25,0x24,0x24,0x23,0x23,0x22,0x22,0x21,0x21,0x20,0x20,
0x1f,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,
0x17,0x17,0x16,0x16,0x15,0x15,0x14,0x14,0x13,0x13,0x12,0x12,0x11,0x11,0x10,0x10,
0xf,0xf,0xe,0xe,0xd,0xd,0xc,0xc,0xb,0xb,0xa,0xa,0x9,0x9,0x8,0x8,
0x7,0x7,0x6,0x6,0x5,0x5,0x4,0x4,0x3,0x3,0x2,0x2,0x1,0x1,0x0,0x0,

распадающийся:

0xff,0xfd,0xfa,0xf8,0xf5,0xf3,0xf0,0xee,0xec,0xea,0xe7,0xe5,0xe3,0xe1,0xde,0xdc,
0xda,0xd8,0xd6,0xd4,0xd2,0xd0,0xce,0xcc,0xca,0xc8,0xc6,0xc4,0xc2,0xc0,0xbe,0xbc,
0xbb,0xb9,0xb7,0xb5,0xb3,0xb2,0xb0,0xae,0xad,0xab,0xa9,0xa8,0xa6,0xa4,0xa3,0xa1,
0xa0,0x9e,0x9c,0x9b,0x99,0x98,0x96,0x95,0x94,0x92,0x91,0x8f,0x8e,0x8d,0x8b,0x8a,
0x88,0x87,0x86,0x85,0x83,0x82,0x81,0x7f,0x7e,0x7d,0x7c,0x7b,0x79,0x78,0x77,0x76,
0x75,0x74,0x72,0x71,0x70,0x6f,0x6e,0x6d,0x6c,0x6b,0x6a,0x69,0x68,0x67,0x66,0x65,
0x64,0x63,0x62,0x61,0x60,0x5f,0x5e,0x5d,0x5c,0x5b,0x5b,0x5a,0x59,0x58,0x57,0x56,
0x55,0x55,0x54,0x53,0x52,0x51,0x51,0x50,0x4f,0x4e,0x4d,0x4d,0x4c,0x4b,0x4a,0x4a,
0x49,0x48,0x48,0x47,0x46,0x46,0x45,0x44,0x44,0x43,0x42,0x42,0x41,0x40,0x40,0x3f,
0x3e,0x3e,0x3d,0x3d,0x3c,0x3c,0x3b,0x3a,0x3a,0x39,0x39,0x38,0x38,0x37,0x37,0x36,
0x35,0x35,0x34,0x34,0x33,0x33,0x32,0x32,0x31,0x31,0x30,0x30,0x30,0x2f,0x2f,0x2e,
0x2e,0x2d,0x2d,0x2c,0x2c,0x2c,0x2b,0x2b,0x2a,0x2a,0x29,0x29,0x29,0x28,0x28,0x27,
0x27,0x27,0x26,0x26,0x26,0x25,0x25,0x25,0x24,0x24,0x23,0x23,0x23,0x22,0x22,0x22,
0x21,0x21,0x21,0x20,0x20,0x20,0x20,0x1f,0x1f,0x1f,0x1e,0x1e,0x1e,0x1d,0x1d,0x1d,
0x1d,0x1c,0x1c,0x1c,0x1c,0x1b,0x1b,0x1b,0x1a,0x1a,0x1a,0x1a,0x19,0x19,0x19,0x19,
0x18,0x18,0x18,0x18,0x18,0x17,0x17,0x17,0x17,0x16,0x16,0x16,0x16,0x16,0x15,0x15,
0x15,0x15,0x15,0x14,0x14,0x14,0x14,0x14,0x13,0x13,0x13,0x13,0x13,0x12,0x12,0x12,
0x12,0x12,0x12,0x11,0x11,0x11,0x11,0x11,0x11,0x10,0x10,0x10,0x10,0x10,0x10,0xf,
0xf,0xf,0xf,0xf,0xf,0xf,0xe,0xe,0xe,0xe,0xe,0xe,0xe,0xd,0xd,0xd,
0xd,0xd,0xd,0xd,0xd,0xc,0xc,0xc,0xc,0xc,0xc,0xc,0xc,0xc,0xb,0xb,
0xb,0xb,0xb,0xb,0xb,0xb,0xb,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,
0xa,0x9,0x9,0x9,0x9,0x9,0x9,0x9,0x9,0x9,0x9,0x9,0x9,0x8,0x8,0x8,
0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x7,0x7,0x7,0x7,0x7,0x7,
0x7,0x7,0x7,0x7,0x7,0x7,0x7,0x7,0x6,0x6,0x6,0x6,0x6,0x6,0x6,0x6,
0x6,0x6,0x6,0x6,0x6,0x6,0x6,0x6,0x6,0x5,0x5,0x5,0x5,0x5,0x5,0x5,
0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x5,0x4,0x4,
0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,
0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,
0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,
0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x2,0x2,0x2,0x2,0x2,0x2,
0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,
0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,
0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x2,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,
0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x1,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,
0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,

Tremolo

Эффект тремоло модулирует входной сигнал гитары, используя синусоидальную волну, сохраненную в памяти. Существует переменная делителя, чтобы заставить синусоидальный цикл работать медленнее, иначе модуляция будет слишком быстрой. Вы можете изменить скорость эффекта с помощью кнопок.

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
// pedalshield_uno_tremolo.ino creates a tremolo effect, modulating the volume with a sinewave.
// pressing the pushbutton_1 or 2 makes the modulation faster or slower.
 
//this waveform is used to modulate the volume of the output signal.
const byte waveform[]=
{
0x0,0x1,0x1,0x2,0x2,0x2,0x3,0x3,0x4,0x4,0x4,0x5,0x5,0x5,0x6,0x6,0x7,0x7,0x7,0x8,
0x8,0x9,0x9,0x9,0xa,0xa,0xb,0xb,0xb,0xc,0xc,0xd,0xd,0xd,0xe,0xe,0xe,0xf,0xf,0x10,
0x10,0x10,0x11,0x11,0x12,0x12,0x12,0x13,0x13,0x14,0x14,0x14,0x15,0x15,0x16,0x16,0x16,0x17,0x17,0x17,
0x18,0x18,0x19,0x19,0x19,0x1a,0x1a,0x1b,0x1b,0x1b,0x1c,0x1c,0x1d,0x1d,0x1d,0x1e,0x1e,0x1e,0x1f,0x1f,
0x20,0x20,0x20,0x21,0x21,0x22,0x22,0x22,0x23,0x23,0x24,0x24,0x24,0x25,0x25,0x26,0x26,0x26,0x27,0x27,
0x27,0x28,0x28,0x29,0x29,0x29,0x2a,0x2a,0x2b,0x2b,0x2b,0x2c,0x2c,0x2d,0x2d,0x2d,0x2e,0x2e,0x2f,0x2f,
0x2f,0x30,0x30,0x30,0x31,0x31,0x32,0x32,0x32,0x33,0x33,0x34,0x34,0x34,0x35,0x35,0x36,0x36,0x36,0x37,
0x37,0x38,0x38,0x38,0x39,0x39,0x39,0x3a,0x3a,0x3b,0x3b,0x3b,0x3c,0x3c,0x3d,0x3d,0x3d,0x3e,0x3e,0x3f,
0x3f,0x3f,0x40,0x40,0x41,0x41,0x41,0x42,0x42,0x42,0x43,0x43,0x44,0x44,0x44,0x45,0x45,0x46,0x46,0x46,
0x47,0x47,0x48,0x48,0x48,0x49,0x49,0x4a,0x4a,0x4a,0x4b,0x4b,0x4b,0x4c,0x4c,0x4d,0x4d,0x4d,0x4e,0x4e,
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0x1,0x1,0x0,0x0,
};
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input, speed=1;
int counter=0;
unsigned int ADC_low, ADC_high;
int sample=0;
int divider=0;
 
void setup() {
  //setup IO
  pinMode(TOGGLE, INPUT_PULLUP);
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
  //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
    else  digitalWrite(LED, LOW);
 
  //nothing else here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
  // get ADC data
  ADC_low = ADCL; // you need to fetch the low byte first
  ADC_high = ADCH;
 
  // the input signal is modulated here using a sinewave
  ADC_low = map(ADC_low, 0,255, 0, waveform[sample]);
  ADC_high = map(ADC_high, 0,255, 0, waveform[sample]);
 
  //construct the input sumple summing the ADC low and high byte.
  input = ((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
 
  counter++; //to save resources, the pushbuttons are checked every 1000 times.
  if(counter==1000)
{ 
 
counter=0;
if (!digitalRead(PUSHBUTTON_2)) {
  if (speed<1024)speed=speed+1; //increase the vol
    digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_1)) {
  if (speed>0)speed=speed-1; //decrease vol
  digitalWrite(LED, LOW); //blinks the led
    }
}
 
  // there is a divider to slow the waveform (otherwise is too fast)
  divider++;
  if (divider==4){ divider=0; sample=sample+speed;}
 
 if(sample>1023)sample=0;
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
}

Volume/Booster эффект

Код ниже - очень простой эффект педали Volume/Booster. Код похож на эффект Transparent/Clean, добавляется только одна строка кода для добавления функции громкости:

input = map (input, -32768, + 32768, -vol_variable, vol_variable);

Таким образом, входной сигнал гитары, который имеет значения от -32768 до +32768, будет отрегулирован на новые значения (громкость), определяемые переменной vol_variable. АЦП считывает гитарный сигнал, PUSHBUTTON_1 и 2 регулируют громкость с помощью функции «map». Наконец, обработанный сигнал записывается в PWM.

// CC-by-www.Electrosmash.com
// Based on OpenMusicLabs previous works.
/* pedalshield_uno_booster.ino reads the ADC and plays it into the PWM output.
 *  pressing the pushbutton_1 or 2 turns the volume up or down.
*/
 
//defining harware resources.
#define LED 13
#define FOOTSWITCH 12
#define TOGGLE 2
#define PUSHBUTTON_1 A5
#define PUSHBUTTON_2 A4

//defining the output PWM parameters
#define PWM_FREQ 0x00FF // pwm frequency - 31.3KHz
#define PWM_MODE 0 // Fast (1) or Phase Correct (0)
#define PWM_QTY 2 // 2 PWMs in parallel

//other variables
int input, vol_variable=10000;
int counter=0;
unsigned int ADC_low, ADC_high;
 
void setup() {
  //setup IO
  pinMode(FOOTSWITCH, INPUT_PULLUP);
  pinMode(TOGGLE, INPUT_PULLUP);
  pinMode(PUSHBUTTON_1, INPUT_PULLUP);
  pinMode(PUSHBUTTON_2, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
 
  // setup ADC
  ADMUX = 0x60; // left adjust, adc0, internal vcc
  ADCSRA = 0xe5; // turn on adc, ck/32, auto trigger
  ADCSRB = 0x07; // t1 capture for trigger
  DIDR0 = 0x01; // turn off digital inputs for adc0
 
  // setup PWM
  TCCR1A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); //
  TCCR1B = ((PWM_MODE << 3) | 0x11); // ck/1
  TIMSK1 = 0x20; // interrupt on capture interrupt
  ICR1H = (PWM_FREQ >> 8);
  ICR1L = (PWM_FREQ & 0xff);
  DDRB |= ((PWM_QTY << 1) | 0x02); // turn on outputs
  sei(); // turn on interrupts - not really necessary with arduino
  }
 
void loop() 
{
    //Turn on the LED if the effect is ON.
  if (digitalRead(FOOTSWITCH)) digitalWrite(LED, HIGH); 
     else  digitalWrite(LED, LOW);
  //nothing here, all happens in the Timer 1 interruption.
}
 
ISR(TIMER1_CAPT_vect) 
{
  // get ADC data
  ADC_low = ADCL; // you need to fetch the low byte first
  ADC_high = ADCH;
  //construct the input sumple summing the ADC low and high byte.
  input = ((ADC_high << 8) | ADC_low) + 0x8000; // make a signed 16b value
 
//// All the Digital Signal Processing happens here: ////
 
counter++; //to save resources, the pushbuttons are checked every 100 times.
if(counter==100)
{ 
counter=0;
if (!digitalRead(PUSHBUTTON_2)) {
  if (vol_variable<32768)vol_variable=vol_variable+10; //increase the vol
    digitalWrite(LED, LOW); //blinks the led
    }
 
    if (!digitalRead(PUSHBUTTON_1)) {
  if (vol_variable>0)vol_variable=vol_variable-10; //decrease vol
  digitalWrite(LED, LOW); //blinks the led
    }
}
 
  //the amplitude of the input signal is modified following the vol_variable value
  input = map(input, -32768, +32768,-vol_variable, vol_variable);
 
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
 
}

Что вам нужно знать о оборудовании?

Вам нужно знать как применяются аппаратные ресурсы (светодиоды, кнопки, АЦП, ШИМ):

Входы

Цифровой 2: Переключатель
Аналоговый 4: Кнопка 1.
Аналоговый 5: Кнопка 2.
Аналоговый 0: Гитарное входное гнездо
Цифровой 12: Педаль, ножной переключатель

Выходы

Цифровой 13: светодиод.
PWM 9 (Цифровой 9): Выходное гнездо
PWM 10 (Цифровой 10): Выходное гнездо

Установка программного обеспечения

Вам потребуется программное обеспечение интегрированной среды разработки (IDE) для Arduino UNO. Она доступна на странице программного обеспечения Arduino со всеми инструкциями. Кроме того, вы можете обратиться к руководству Arduino UNO для получения более подробной информации.

Когда всё программное обеспечение установлено, схема должна выглядеть так:

Скетчи и программирование

Выше вы уже могли заметить серию скетчей для разных эффектов педали. Все эти эффекты имеют «образовательные» цели. Идея состоит в том, чтобы иметь их в качестве основы для начала улучшения или программирования собственных эффектов, поэтому коды имеют баланс между производительностью и сложностью, чтобы вы могли легко их понять. Переход от простого к трудному, естественная эволюция.

Ардуино+