ElectroSmash_Team OFFLINE Junior Member Posts: 28 Thank you received: 2 Karma: 1 This code generates a sine wave that can be modified in frequency. It is a great tool to troubleshoot the circuit because it only uses the output stage, so if the code works your output stage will be fine for sure. One single cycle of a sinusoidal waveform (variable byte waveform[]) is stored in memory and played in a loop creating the sound. You can change the frequency of the waveform by pressing the push-buttons, it simply will make the pointer go advance in 1 by 1, 2 by 2, 3 by 3, etc increasing the perceived frequency. This approach is called DDS (Direct Digital Synthesis) if you want to learn more about it there is a great tutorial on the RCArduino website: rcarduino.blogspot.co.uk/2012/12/arduino...1-sinewaves-and.html To create the waveform samples to be stored in memory we have used this website: www.daycounter.com/Calculators/Sine-Generator-Calculator.phtml (the desired signal is 1023 points and 255 max. amplitude) If you want to use different waveform you can create a triangular using this website: www.daycounter.com/Calculators/Triangle-...tor-Calculator.phtml This is the complete code of the sinewave generator for pedalshield MEGA: // CC-by-NC www.Electrosmash.com/rights // Based on OpenMusicLabs and GFB previous works. // pedalshield_mega_signal_generator.ino plays a waveform stores in memory (waveform[]) // pressing the pushbutton_1 or 2 changes the frequency.   #include "U8glib.h" U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NO_ACK); // Display which does not send ACK   const byte waveform[]= 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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); pinMode(6, OUTPUT); //PWM0 as output pinMode(7, OUTPUT); //PWM1 as 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 TCCR4A = (((PWM_QTY - 1) << 5) | 0x80 | (PWM_MODE << 1)); // TCCR4B = ((PWM_MODE << 3) | 0x11); // ck/1 TIMSK4 = 0x20; // interrupt on capture interrupt ICR4H = (PWM_FREQ >> 8); ICR4L = (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 and write the OLED if the effect is ON. if (digitalRead(FOOTSWITCH)) { digitalWrite(LED, HIGH); //light the LED u8g.firstPage(); do { u8g.setFont(u8g_font_helvR14r); u8g.drawStr( 0, 16, " SIGNAL "); u8g.drawStr( 0, 36, " GENERATOR "); u8g.setPrintPos(50, 64); u8g.setFont(u8g_font_helvR24r); u8g.print(speed); } while( u8g.nextPage() ); } else { digitalWrite(LED, LOW); // switch-off the LED u8g.firstPage(); do { u8g.setFont(u8g_font_helvR24r); u8g.drawStr( 0, 30, "EFFECT"); u8g.drawStr( 0, 60, " OFF"); } while( u8g.nextPage() ); } }   ISR(TIMER4_CAPT_vect) {   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 } }   sample=sample+speed; if(sample>1023)sample=0;   //write the PWM output signal OCR4AL =waveform[sample]; OCR4BL = waveform[sample]; }       The administrator has disabled public write access.