/*
  Forum: https://forum.arduino.cc/t/problem-sending-program-change-through-arduino-pro-micro/1405537
  Wokwi: https://wokwi.com/projects/4414278985324093457

  ec2021
  2025/09/07

  This version calls changeLed() with every loop while the
  digitalRead state is LOW.

*/

constexpr byte buttonPin {2};  // pushbutton pin
constexpr byte ledPin {10};  // led pin


void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP); // Configure button as Input
  pinMode(ledPin, OUTPUT);
}


void loop() {
  if (digitalRead(buttonPin) == LOW) {
    changeLed();
  }
}

void changeLed() {
  static byte ledState = HIGH;
  static unsigned long counter = 0;
  counter++;
  digitalWrite(ledPin, ledState);
  Serial.print((ledState) ? "On\t" : "Off\t");
  Serial.println(counter);
  ledState = !ledState;
}