arduino button counter coding problem

hye guys, im still newbie in coding, but is anyone know how to make the led on for a few second and went off afterward.. the original coding is to make the led on after push the button 4 time... and went off after the fifth button were pushed... i want to make the button ON and went OFF after a few second or even wonderfull if the led blink for a few second before it went OFF.. really appreciate if anyone could help show me the coding... thanks a lot for any help :slight_smile: :slight_smile:


State change detection (edge detection)

Often, you don't need to know the state of a digital input all the time,
but you just need to know when the input changes from one state to another.
For example, you want to know when a button goes from OFF to ON. This is called
state change detection, or edge detection.

This example shows how to detect when a button or button changes from off to on
and on to off.

The circuit:

  • pushbutton attached to pin 2 from +5V
  • 10K resistor attached to pin 2 from ground
  • LED attached from pin 13 to ground (or use the built-in LED on
    most Arduino boards)

created 27 Sep 2005
modified 30 Aug 2011
by Tom Igoe

This example code is in the public domain.


// this constant won't change:
const int buttonPin = 2; // the pin that the pushbutton is attached to
const int ledPin = 13; // the pin that the LED is attached to

// Variables will change:
int buttonPushCounter = 0; // counter for the number of button presses
int buttonState = 0; // current state of the button
int lastButtonState = 0; // previous state of the button

void setup() {
// initialize the button pin as a input:
pinMode(buttonPin, INPUT);
// initialize the LED as an output:
pinMode(ledPin, OUTPUT);
// initialize serial communication:

void loop() {
// read the pushbutton input pin:
buttonState = digitalRead(buttonPin);

// compare the buttonState to its previous state
if (buttonState != lastButtonState) {
// if the state has changed, increment the counter
if (buttonState == HIGH) {
// if the current state is HIGH then the button
// wend from off to on:
Serial.print("number of button pushes: ");
} else {
// if the current state is LOW then the button
// wend from on to off:
// Delay a little bit to avoid bouncing
// save the current state as the last state,
//for next time through the loop
lastButtonState = buttonState;

// turns on the LED every four button pushes by
// checking the modulo of the button push counter.
// the modulo function gives you the remainder of
// the division of two numbers:
if (buttonPushCounter % 4 == 0) {
digitalWrite(ledPin, HIGH);
} else {
digitalWrite(ledPin, LOW);