Digital Electronics Lab #4

Video:

Code:

int blueLed = 7;                      // create variables for each of the components on the breadboard
int greenLed = 8;
int whiteLed = 9;
int yellowLed = 10;
int tempoPin = A13;
int potPin1 = A14;
int potPin2 = A15;
int potPin3 = A16;
int potPin4 = A17;
int octaveSwitch = 28;
int powerSwitch = 27;

int tempoVal = 0;                   //map variables
int lastTempoVal = 0;

int potVal1 = 0;
int lastPotVal1 = 0;
int potVal2 = 0;
int lastPotVal2 = 0;
int potVal3 = 0;
int lastPotVal3 = 0;
int potVal4 = 0;
int lastPotVal4 = 0;

int octave = 12;                    //octave switch variable





void setup() {
  pinMode(blueLed, OUTPUT);       //pinMode for LEDs and switches
  pinMode(greenLed, OUTPUT);
  pinMode(whiteLed, OUTPUT);
  pinMode(yellowLed, OUTPUT);
  pinMode(octaveSwitch, INPUT);
  pinMode(powerSwitch, INPUT);


}

void loop() {

  stepSequencer();                //stepSequencer and checkOctave 
  checkOctave();

}



void stepSequencer() {                                           //stepSequencer function

  if (digitalRead(powerSwitch) == HIGH) {                       //powerSwitch must be turned on


    lastTempoVal = tempoVal;                                   // tempo map
    tempoVal = map(analogRead(tempoPin), 0, 1023, 100, 1000);


    lastPotVal1 = potVal1;                                    //first pitch
    potVal1 = map(analogRead(potPin1), 0, 1023, 60, 72);      //first pitch map
    digitalWrite(blueLed, HIGH);                              // the first LED and pitch turns on, the rest are off
    digitalWrite(greenLed, LOW);
    digitalWrite(whiteLed, LOW);
    digitalWrite(yellowLed, LOW);
    usbMIDI.sendNoteOn(potVal1 - octave, 127, 1); 
    delay(tempoVal);                                          // the LED and pitch remains like this for a value determined by the pot
    usbMIDI.sendNoteOff(potVal1 - octave, 0, 1);              //note off

    lastPotVal2 = potVal2;                                    //second pitch
    potVal2 = map(analogRead(potPin2), 0, 1023, 60, 72);      //second pitch map
    digitalWrite(blueLed, LOW);                               // the second LED and pitch turns on, the rest are off
    digitalWrite(greenLed, HIGH);
    digitalWrite(whiteLed, LOW);
    digitalWrite(yellowLed, LOW);
    usbMIDI.sendNoteOn(potVal2 - octave, 127, 1);            
    delay(tempoVal);                                         // the LED and pitch remains like this for a value determined by the pot
    usbMIDI.sendNoteOff(potVal2 - octave, 0, 1);             //note off
  
    lastPotVal3 = potVal3;                                  // third pitch
    potVal3 = map(analogRead(potPin3), 0, 1023, 60, 72);    //third pitch map
    digitalWrite(blueLed, LOW);                             // the third LED and pitch turns on, the rest are off
    digitalWrite(greenLed, LOW);
    digitalWrite(whiteLed, HIGH);
    digitalWrite(yellowLed, LOW);
    usbMIDI.sendNoteOn(potVal3 - octave, 127, 1);        
    delay(tempoVal);                                      // the LED and pitch remains like this for a value determined by the pot
    usbMIDI.sendNoteOff(potVal3 - octave, 0, 1);          //note off

    lastPotVal4 = potVal4;                               // fourth pitch
    potVal4 = map(analogRead(potPin4), 0, 1023, 60, 72); //fourth pitch map
    digitalWrite(blueLed, LOW);                         // the fourth LED and pitch turns on, the rest are off
    digitalWrite(greenLed, LOW);
    digitalWrite(whiteLed, LOW);
    digitalWrite(yellowLed, HIGH);
    usbMIDI.sendNoteOn(potVal4 - octave, 127, 1);
    delay(tempoVal);                                  // the LED and pitch remains like this for a value determined by the pot
    usbMIDI.sendNoteOff(potVal4 - octave, 0, 1);      //note off
    digitalWrite(blueLed, LOW);                       //LEDs turn off
    digitalWrite(greenLed, LOW);
    digitalWrite(whiteLed, LOW);
    digitalWrite(yellowLed, LOW);
  }
}

void checkOctave() {                                  //checkOctave function
  if (digitalRead(octaveSwitch) == LOW) {             //if switch is off, octave is 0, won't add anything to the pitches
    octave = 0;
  }
  if (digitalRead(octaveSwitch) == HIGH) {            // if switch is on, octave is 12, will subtract an octave from the pitches
    octave = 12;
  }
}