Digital Lab 11

The Code:

int buttonPins[5] = {29, 30, 31, 32, 33};
int totalButtons = 5;
int ledPins[4] = {7, 8, 9, 10};
int total = 4;

int channelLEDs[3] = {18, 17, 16};
int totalChannels = 3;

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

bool lastButtonState2 = LOW;
bool buttonState2 = LOW;
int currentStep2 = 0;

bool switchedOn[3][4] = {
    {false, true, false, false},
    {false, true, true, true},
    {true, false, true, false}
  };

unsigned long lastStepTime = 0;
int currentStep = 0;
int tempo = 0;
int channelDisplayed = 0;

int midiNotes[3] = {60, 61, 62};

void setup() {
  for(int i = 0; i < total; i++){
    pinMode(ledPins[i], OUTPUT);
  }
  for(int i = 0; i < totalButtons; i++){
    pinMode(buttonPins[i], INPUT);
  }
  for(int i = 0; i < totalChannels; i++){
    pinMode(channelLEDs[i], OUTPUT);
  }

}

void loop() {
  checkChannelButton();
  updateChannelLeds();
  checkButton();
  updateLeds();
  tempo = analogRead(A15);
  stepForwards();

}


void stepForwards(){
  if(millis() >= tempo + lastStepTime){
    lastStepTime = millis();
    for(int i = 0; i < totalChannels; i++){
      usbMIDI.sendNoteOff(midiNotes[i], 127, 1);
      
      if(switchedOn[i][currentStep] == HIGH){
        usbMIDI.sendNoteOn(midiNotes[i], 127, 1);
      }
    }
    currentStep++;
  }
  if(currentStep == total){
    currentStep = 0;
  }
}

void checkButton(){
  for(int i = 0; i < total; i++){
    lastButtonState[i] = buttonState[i];
    buttonState[i] = digitalRead(buttonPins[i]);

    if(lastButtonState[i] == LOW && buttonState[i] == HIGH){
      switchedOn[channelDisplayed][i] = !switchedOn[channelDisplayed][i];
      delay(5);
    }
    else if(lastButtonState == HIGH && buttonState == LOW ){
      delay(5);
    }
  }
}

void checkChannelButton(){
  lastButtonState2 = buttonState2;
  buttonState2 = digitalRead(buttonPins[4]);
  
  if(lastButtonState2 == LOW && buttonState2 == HIGH){
    channelDisplayed++;
    delay(5);
  }
  else if(lastButtonState2 == HIGH && buttonState2 == LOW ){
    delay(5);
  }
  
  if(channelDisplayed >= totalChannels){
    channelDisplayed = 0;
  }
}

void updateChannelLeds(){
  for(int i = 0; i < totalChannels; i++){
    if(i == channelDisplayed){
      digitalWrite(channelLEDs[i], HIGH);
    }
    else{
      digitalWrite(channelLEDs[i], LOW);
    }
  }
}

void updateLeds(){
  for(int i = 0; i < total; i++){
    if(switchedOn[channelDisplayed][i] == true or i == currentStep){
      digitalWrite(ledPins[i], HIGH);
    }
    else{
      digitalWrite(ledPins[i], LOW);
    }
  }
}

For my final project, I’d like to combine the multi-channel drum sequencer with visuals from Processing. I would like to have visuals that reflected the sound coming from the drum sequencer. I’m not sure how ambitious this project idea is yet, but right now I also think I would add more channels as well as steps in the sequence. I might try to add more of the ideas listed in the final project post, but the main idea is to combine visuals from Processing with the multi-channel drum sequencer.