Lab 3

Video of Working Circuit: https://youtu.be/q9PFLHi0AZQ

Code:

int led1 = 8;                   //variable for led1
int led2 = 9;                   //variable for led2 
int led3 = 10;                  //variable for led3
int led4 = 11;                  //variable for led4
int button1 = 37;               //variable for button1
int button2 = 36;               //variable for button2
int button3 = 35;               //variable for button3
int button4 = 34;               //variable for button3
int switchPin1 = 31;            //variable for slide switch 1
int potValue = 0;

void setup() {
  pinMode(led1, OUTPUT);             //set pin modes to input/output
  pinMode(led2, OUTPUT);       
  pinMode(led3, OUTPUT);          
  pinMode(led4, OUTPUT);          
  pinMode(button1, INPUT);    
  pinMode(button2, INPUT);  
  pinMode(button3, INPUT);      
  pinMode(button4, INPUT);          
  pinMode(switchPin1, INPUT);          
}

void loop() {                                  //determine mode
  if (digitalRead(switchPin1) == HIGH) {    
    arpeggioMode();
  } else if (digitalRead(switchPin1) == LOW) {
    keyboardMode();
  }
}

void keyboardMode() {
  checkButtonPin(button1, led1, 60);
  checkButtonPin(button2, led2, 64);
  checkButtonPin(button3, led3, 67);
  checkButtonPin(button4, led4, 71);
}

void arpeggioMode() {
  if (digitalRead(button1) == HIGH) {
    arpeggio(60);
  } if (digitalRead(button2) == HIGH) {
    arpeggio(64);
  } if (digitalRead(button3) == HIGH) {
    arpeggio(67);
  } if (digitalRead(button4) == HIGH) {
    arpeggio(71);
  }
}

void checkButtonPin(int buttonPin, int ledPin, int note) {
  if (digitalRead(buttonPin) == HIGH) {
    usbMIDI.sendNoteOn(note, 127, 1);
    digitalWrite(ledPin, HIGH);
    delay(500);
    usbMIDI.sendNoteOff(note, 0, 1);
    digitalWrite(ledPin, LOW);
    delay(500);
  }
}

void arpeggio(int note) {
  potValue = analogRead(A13);
  usbMIDI.sendNoteOn(note, 127, 1);         //play note
  digitalWrite(led1, HIGH);
  delay(potValue);
  usbMIDI.sendNoteOff(note, 0, 1);
  digitalWrite(led1, LOW);
  usbMIDI.sendNoteOn(note + 4, 127, 1);     //note + 4 semitones
  digitalWrite(led2, HIGH);
  delay(potValue);
  usbMIDI.sendNoteOff(note + 4, 0, 1);
  digitalWrite(led2, LOW);
  usbMIDI.sendNoteOn(note + 7, 127, 1);     //note + 7 semitones
  digitalWrite(led3, HIGH);
  delay(potValue);
  usbMIDI.sendNoteOff(note + 7, 0, 1);
  digitalWrite(led3, LOW);
  usbMIDI.sendNoteOn(note + 11, 127, 1);    //note + 11 semitones
  digitalWrite(led4, HIGH);
  delay(potValue);
  usbMIDI.sendNoteOff(note + 11, 0, 1);
  digitalWrite(led4, LOW);
  
}