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Hello!
I'm trying to make the counter in the following example code to reset every second. I have no ideas on how to make one. Any help?
Code:
/*
  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 14 Oct 2010
 by Tom Igoe

This example code is in the public domain.
       
 http://arduino.cc/en/Tutorial/ButtonStateChange
 
 */

// 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:
  Serial.begin(9600);
}


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:
      buttonPushCounter++;
      Serial.println("on");
      Serial.print("number of button pushes:  ");
      Serial.println(buttonPushCounter, DEC);
    }
    else {
      // if the current state is LOW then the button
      // wend from on to off:
      Serial.println("off");
    }
  }
  // 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);
  }
  
}
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Reset from the last button click?  Reset at 1s, 2s, 3s, etcetera?
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This http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay example uses millis() to see how much time has gone by (interval). Take a good look and try to merge it into your app.
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Reset from the last button click?  Reset at 1s, 2s, 3s, etcetera?
I meant that the counter would reset every second no matter how many times you press the button.
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Got it.  Is the Blink w/o Delay making sense?
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Blink without delay shows a good use of millis() imho
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