Single Double Click and Long Press Detection

Solving Approach

How do you plan to solve it?

 I will connect a push button to a GPIO pin and use timing functions (millis()) to measure the duration and sequence of button presses. A short press will be detected as a single click, two quick presses within a short interval will be recognized as a double click, and holding the button beyond a threshold time will be identified as a long press. Finally, I will print the detected action to the Serial Monitor for verification.
 

Code

/*Paste your code here*/

#define BUTTON_PIN 2   // Button connected to pin 2

// Timing settings
#define DEBOUNCE_DELAY 50
#define DOUBLE_CLICK_TIME 400
#define LONG_PRESS_TIME 1000

// Variables
unsigned long lastPressTime = 0;
unsigned long buttonDownTime = 0;
unsigned long lastButtonChangeTime = 0;
bool buttonPressed = false;
int pressCount = 0;

void setup() {
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  Serial.begin(115200);
}

void loop() {
  int buttonState = digitalRead(BUTTON_PIN);
  unsigned long currentTime = millis();

  // Debounce check
  if (currentTime - lastButtonChangeTime > DEBOUNCE_DELAY) {
    // Button pressed
    if (buttonState == LOW && !buttonPressed) {
      buttonPressed = true;
      buttonDownTime = currentTime;
      lastButtonChangeTime = currentTime;
    }

    // Button released
    if (buttonState == HIGH && buttonPressed) {
      buttonPressed = false;
      unsigned long pressDuration = currentTime - buttonDownTime;
      lastButtonChangeTime = currentTime;

      if (pressDuration >= LONG_PRESS_TIME) {
        Serial.println("Long press detected");
        pressCount = 0;
      } else {
        if (currentTime - lastPressTime <= DOUBLE_CLICK_TIME) {
          Serial.println("Double click detected");
          pressCount = 0;
        } else {
          pressCount = 1;
        }
        lastPressTime = currentTime;
      }
    }
  }

  // Handle single click if no second click comes
  if (pressCount == 1 && (currentTime - lastPressTime > DOUBLE_CLICK_TIME)) {
    Serial.println("Single click detected");
    pressCount = 0;
  }
}

Output

Video