/*
  Forum: https://forum.arduino.cc/t/trying-to-make-a-short-and-long-press-function-with-button/1221545
  Wokwi: https://wokwi.com/projects/389182520812865537

  2024/02/08
  ec2021

*/

const byte buttonPin = 2;
unsigned long pressTime = 0;

void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.println("Start");
}

void loop() {
  // put your main code here, to run repeatedly:
  if (buttonReleased(pressTime)) {
    Serial.println(pressTime);
  }
}


boolean buttonReleased(unsigned long &buttonPressTime) {
  static unsigned long downTime;
  static unsigned long lastChange = 0;
  static byte lastState = HIGH;
  static byte state = HIGH;
  byte actState = digitalRead(buttonPin);
  if (actState != lastState) {
    lastChange = millis();
    lastState = actState;
  }
  if (actState != state && millis() - lastChange > 20) {
    state = actState;
    if (state) {
      buttonPressTime = millis() - downTime;
    } else {
      downTime = millis();
    }
    return (state);
  }
  return false;
}