Midi to DIY Synth

start_ard_synth_midi

#include <TimerOne.h>
 
const byte PWMDAC1pin = 9; // PWM DAC, only pins 9 and 10 are allowed
const byte PWMDAC2pin = 10; // example using second DAC
const byte period = 32; // for 8 bit DAC 
 

byte commandByte;
byte noteByte;
byte velocityByte;

byte noteOn = 144;

//light up led at pin 13 when receiving noteON message with note = 60

void setup(){
  pinMode(PWMDAC1pin, OUTPUT);  
  Timer1.initialize(period); 
  Serial.begin(115200);
  pinMode(13,OUTPUT);
  digitalWrite(13,LOW);
  pinMode(9,OUTPUT);
}

void checkMIDI(){
  do{
    if (Serial.available()){
      commandByte = Serial.read();//read first byte
      noteByte = Serial.read();//read next byte
      velocityByte = Serial.read();//read final byte
      if (commandByte == noteOn){//if note on message
        //check if note == 60 and velocity > 0
        if ( velocityByte > 0){
          digitalWrite(13,HIGH);//turn on led
        //  analogWrite(9,noteByte);
          Timer1.pwm(PWMDAC1pin,(abs)((int)noteByte*8-1023));
          pinMode(5,INPUT);
        }
      }
     else if(commandByte == 128){
        digitalWrite(13,LOW);
        digitalWrite(9,LOW);
        pinMode(5,OUTPUT);
    }
  }
  }
  while (Serial.available() > 2);//when at least three bytes available
}
    


void loop(){
  checkMIDI();
  delay(1);
 //digitalWrite(13,LOW);//turn led off
}