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Topic: counter reset (Read 891 times) previous topic - next topic

Make

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: [Select]
/*
 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);
 }
 
}

Coding Badly


Reset from the last button click?  Reset at 1s, 2s, 3s, etcetera?

robtillaart

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.
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

Make

Quote
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.

Coding Badly


Got it.  Is the Blink w/o Delay making sense?

robtillaart

Blink without delay shows a good use of millis() imho
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

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