Single Double Click and Long Press Detection

Solving Approach

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Code

// Define the push button pin
const int buttonPin = 2;

// Variables for button state tracking
int buttonState;
int lastButtonState = LOW;

// Timestamps for timing events
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
unsigned long lastClickTime = 0;
unsigned long longPressTime = 1000;
unsigned long doubleClickDelay = 250;

// Variables for click counting and long press detection
int clickCount = 0;
bool longPressTriggered = false;

void setup() {
  // Set the button pin as an input with the internal pull-up resistor enabled
  pinMode(buttonPin, INPUT_PULLUP);
  // Initialize serial communication
  Serial.begin(9600);
}

void loop() {
  // Read the current state of the button
  int reading = digitalRead(buttonPin);

  // Debounce the button input
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

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

      // Detect button press
      if (buttonState == LOW) {
        clickCount++;
        lastClickTime = millis();
        longPressTriggered = false;
      }
    }
  }

  // Handle button release to check for clicks
  if (buttonState == HIGH && !longPressTriggered) {
    if (clickCount > 0 && (millis() - lastClickTime) > doubleClickDelay) {
      if (clickCount == 1) {
        Serial.println("Single Click!");
      } else if (clickCount == 2) {
        Serial.println("Double Click!");
      }
      clickCount = 0;
    }
  }

  // Handle long press detection
  if (buttonState == LOW && (millis() - lastClickTime) > longPressTime && !longPressTriggered) {
    Serial.println("Long Press!");
    longPressTriggered = true;
    clickCount = 0;
  }

  // Update last button state for the next loop iteration
  lastButtonState = reading;
}

Output

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