Latching version of arduino footswitch script

midi-switch-latching.ino

int ledPin = 12;
// pin that is connected to the footswitch
int buttonPin = 2;

int buttonState = 0;
int buttonLastState = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  
  // Setup serial port for MIDI communication
  Serial.begin(31250);
  
  // read current button state, a press is detected whenever
  // state changes to anything else than the init state
  buttonLastState = digitalRead(buttonPin);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  
  // has the state changed?
  if (buttonState != buttonLastState) {
    if (buttonState == HIGH) {
      // mute and light up LED
      digitalWrite(ledPin, HIGH);
      // send CC 85 on channel 2 with value 0 to mute
      // mute group 6 on a Behringer X32
      midiCc(2, 85, 0);
    } else {
      // unmute and turn off LED
      digitalWrite(ledPin, LOW);
      midiCc(2, 85, 127);
    }
    buttonLastState = buttonState;
    // workaround to prevent fluttering of button state
    delay(10);
  }
}

void midiCc(int channel, int command, int value) {
  Serial.write(175 + channel);
  Serial.write(command);
  Serial.write(value);
}