Single Double Click and Long Press Detection

Solving Approach

1. Hardware Setup:

Connect a push button to a GPIO pin (say pin 2) with a pull-down or internal pull-up resistor.

The button will send a HIGH signal when pressed.

2. Logic:

Measure the time between button press and release.

If button is pressed and released quickly → single click.

If two presses occur within a short time interval (say < 400 ms) → double click.

If button is held down for a long duration (say > 1 second) → long press.

3. Implementation Steps:

Use millis() to track press timings.

Use simple state tracking (pressed, released) to detect different cases.

Code

const int buttonPin = 2;   // GPIO pin for button
unsigned long lastPressTime = 0;
unsigned long pressDuration = 0;
unsigned long lastReleaseTime = 0;
bool buttonState = LOW;
bool lastButtonState = LOW;
int pressCount = 0;
void setup() {
  pinMode(buttonPin, INPUT_PULLUP); // use internal pull-up resistor
    Serial.begin(115200);
    }
    void loop() {
      buttonState = digitalRead(buttonPin);
        // Detect press
          if (buttonState == LOW && lastButtonState == HIGH) {
              lastPressTime = millis();
                }
                  // Detect release
                    if (buttonState == HIGH && lastButtonState == LOW) {
                        pressDuration = millis() - lastPressTime;
                            lastReleaseTime = millis();
                                pressCount++;
                                  }
                                    // Long press detection
                                      if (buttonState == LOW && (millis() - lastPressTime > 1000)) {
                                          Serial.println("Long press detected");
                                              // Prevent multiple triggers
                                                  while (digitalRead(buttonPin) == LOW);
                                                      pressCount = 0;
                                                        }
                                                          // Single or Double click detection
                                                            if (pressCount == 1 && (millis() - lastReleaseTime > 400)) {
                                                                Serial.println("Single click detected");
                                                                    pressCount = 0;
                                                                      }
                                                                        else if (pressCount == 2) {
                                                                            Serial.println("Double click detected");
                                                                                pressCount = 0;
                                                                                  }
                                                                                    lastButtonState = buttonState;
                                                                                    }

Output

"Single click detected"

"Double click detected"

"Long press detected"

Video