Digital Electronics Lab #8

Video:

Code:

int buttonPin[4] = {33, 34, 35, 36};
int ledPin[4] = {7, 8, 9, 10};
int totalLedPins = 4;
int totalButtonPins = 4;

int tempoPot = A13;
int tempoValue = 0;

int slideSwitch = 31;

unsigned long lastStep = 0;
int currentStep = 0;
int totalSteps = 4;


bool lastButtonState[4] = {LOW, LOW, LOW, LOW};
bool buttonState[4] = {LOW, LOW, LOW, LOW};

bool switchedOn[4] = {false, false, false, false};

void setup() {
  for (int i = 0; i < totalLedPins; i ++) {
    pinMode(ledPin[i], OUTPUT);
  }
  for (int i = 0; i < totalButtonPins; i ++) {
    pinMode(buttonPin[i], INPUT);
  }

  pinMode(slideSwitch, INPUT);

}

void loop() {

  if (digitalRead(slideSwitch) == LOW) {                        //stepForwards
    checkButtons();
    updateLeds();
    stepForwards();
  }

  if (digitalRead(slideSwitch) == HIGH) {                     //stepBackwards
    checkButtons();
    updateLeds();
    stepBackwards();
  }
}

void checkButtons() {                                        //check the status of the button
  for (int i = 0; i < totalButtonPins; i++) {
    lastButtonState[i] = buttonState[i];
    buttonState[i] = digitalRead(buttonPin[i]);
    if (lastButtonState[i] == LOW && buttonState[i] == HIGH) {
      switchedOn[i] = !switchedOn[i];                         // this means: if switchedOn is true then set it to false, if switchedOn is false then set it to true
      delay(5);
    } else if (lastButtonState[i] == HIGH && buttonState[i] == LOW) {
      delay(5);
    }
  }
}


void updateLeds() {                                       //update the LEDs based on the status of the button
  for (int i = 0; i < totalLedPins; i++) {
    if (switchedOn[i] == true) {
      digitalWrite(ledPin[i], HIGH);
    } else {
      digitalWrite(ledPin[i], LOW);
    }
  }
  digitalWrite(ledPin[currentStep], HIGH);             //ensure that the LED of the current step is always HIGH (results in consistent blinking as the steps are raised or lowered)
}

void stepForwards() {                                 //step forwards, and send a MIDI note for each engaged step
  tempoValue = analogRead(A13);
  if (millis() > lastStep + tempoValue) {
    lastStep = millis();
    usbMIDI.sendNoteOff(44, 127, 1);
    countUp();
    if (switchedOn[currentStep] == HIGH) {
      usbMIDI.sendNoteOn(44, 127, 1);
    }
  }
}

void stepBackwards() {                              //step backwards and send a MIDI note for each engaged step
  tempoValue = analogRead(A13);
  if (millis() > lastStep + tempoValue) {
    lastStep = millis();
    usbMIDI.sendNoteOff(44, 127, 1);
    countDown();
    if (switchedOn[currentStep] == HIGH) {
      usbMIDI.sendNoteOn(44, 127, 1);
    }
  }
}





void countUp() {                                    //countUp function (for stepForwards)
  currentStep++;
  if (currentStep == totalSteps) {
    currentStep = 0;
  }
}
  
                                                  //countDown function (for stepBackwards)
void countDown() {
  currentStep--;
  if (currentStep < 0) {
    currentStep = 3;
  }
}