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Arduino Tutorial Series Stay ON

LED Using Millis-Based Debouncing

Posted on January 4, 2013by admin

...

Turning the LED on with a single button push and turning it off

again with another button push. This sketch is based on millis

debouncing and not on simple delay debounce. With this sketch,

continuously pressing the button will not make the led go on and

off. If the led is OFF, pressing and releasing the button

(regardless of time length) will turn it ON. Pressing it again will

turn the led off.

Home Arduino Tutorials About Me
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recent commentstan on Fixing the Slow Arduino

IDE | More Than 20 Seconds

Delay

Aldionon The Huawei Mobile

Pocket Wifi E5220

const byte buttonpin = 2;

int buttonvalue = 0;

int interval = 300;

int onoff = 0;

unsigned long timeone;

const byte ledpin = 13;

void setup(){//void setup begin

pinMode(ledpin,OUTPUT);

pinMode(buttonpin,INPUT);

}//void setup end

void loop(){//void loop begin// read the status of buttonpin

buttonvalue = digitalRead(buttonpin);

// I think this very short delay is

// necessary to stabilize the code

delay(50);

// SET THE timeone VALUE TO

// millis() IF THE buttonvalue ==// TO one

if(buttonvalue == 1){

timeone = millis();

}

// COMPUTES WAIT FOR THE interval VALUE
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Aldionon The Huawei Mobile

Pocket Wifi E5220

admin on Gizduino Mini on

Windows 7 and Windows 8

loreen on Gizduino Mini on

Windows 7 and Windows 8

tags

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electricityepsonfanfreedom

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// INCREMENT onoff VALUE BY 1

if((millis()-timeone) == interval){

onoff = onoff + 1;

}

// IF THE VALUE OF onoff

// TURNS 3, THEN RETURN IT

// TO ONE

if(onoff == 3){

onoff = 1;

}

// TURN THE LED ON OR OFF

// DEPENDING VALUE OF

// onoff VARIABLE

if (onoff == 2){

digitalWrite(ledpin,HIGH);

}

if (onoff == 1){

digitalWrite(ledpin,LOW);

}

}// void loop end
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