Single Double Click and Long Press Detection
Solving Approach
How do you plan to solve it?
To distinguish between a single click, a double click, and a long press using a single push-button, you'll need a combination of simple hardware and smart software. The hardware setup is easy: just wire the button to a microcontroller pin and use a pull-up resistor. On the software side, the microcontroller constantly checks if the button has been pressed. When it detects a press, it starts a timer. If the button is held down past a specific time limit, it's a long press. If the button is released quickly, the program then waits for a short period to see if a second press occurs. If a second press happens within that window, it's a double click. If the time window closes without a second press, the initial action is logged as a single click. This method relies on timing and tracking the button's state to accurately differentiate between the three types of presses.
Code
/*Paste your code here*/
const int buttonPin = 2;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
unsigned long lastClickTime = 0;
unsigned long pressStartTime = 0;
bool buttonState = HIGH; // Current state of button
bool lastButtonState = HIGH; // Previous state of button
int clickCount = 0;
bool longPressDetected = false;
void setup() {
pinMode(buttonPin, INPUT_PULLUP); // Use internal pull-up resistor
Serial.begin(115200);
}
void loop() {
int reading = digitalRead(buttonPin);
// Debounce
if (reading != lastButtonState) {
lastDebounceTime = millis();
}
if ((millis() - lastDebounceTime) > debounceDelay) {
if (reading != buttonState) {
buttonState = reading;
// Button pressed
if (buttonState == LOW) {
pressStartTime = millis();
longPressDetected = false;
}
// Button released
else {
unsigned long pressDuration = millis() - pressStartTime;
// Check for long press
if (pressDuration >= 1000) {
Serial.println("Long press detected");
longPressDetected = true;
clickCount = 0;
} else {
clickCount++;
if (clickCount == 1) {
lastClickTime = millis();
}
}
}
}
}
// Single Click vs double click
if (clickCount > 0 && !longPressDetected) {
if ((millis() - lastClickTime) > 400) { // 400 ms timeout for double click
if (clickCount == 1) {
Serial.println("Single click detected");
} else if (clickCount == 2) {
Serial.println("Double click detected");
}
clickCount = 0;
}
}
lastButtonState = reading;
}
Output
Video
Add a video of the output (know more)
