Single Double Click and Long Press Detection

Solving Approach

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Code

const int buttonPin = 2;


unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 50; // ms


unsigned long lastPressTime = 0;        
const unsigned long doubleClickDelay = 400;
const unsigned long longPressTime = 800;    

int buttonState = HIGH;        
int lastReading = HIGH;        
unsigned long pressStartTime = 0;
int clickCount = 0;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(115200);
}
void loop() {
  int reading = digitalRead(buttonPin);

 
  if (reading != lastReading) {
    lastDebounceTime = millis();
  }

 
  if (millis() - lastDebounceTime > debounceDelay) {
    if (reading != buttonState) {
      
      buttonState = reading;

      if (buttonState == LOW) {
        
        pressStartTime = millis();
      } else {
       
        unsigned long pressDuration = millis() - pressStartTime;

        if (pressDuration >= longPressTime) {
          Serial.println("Long press detected");
          clickCount = 0; 
        } else {
          
          clickCount++;
          lastPressTime = millis();
        }
      }
    }
  }

  
  if (clickCount == 1 && (millis() - lastPressTime > doubleClickDelay)) {
    Serial.println("Single click detected");
    clickCount = 0;
  } else if (clickCount == 2) {
    Serial.println("Double click detected");
    clickCount = 0;
  }

  lastReading = reading;
}

Output

Video

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https://wokwi.com/projects/442533992111735809