Most Simplest Toggle Switch With Arduino

Simple! I hope you like it! Enjoy to fool around!

Nothing more to say than in the commenting code...

Step 1: The Code

/*********************
Simple toggle switch
Created by: P.Agiakatsikas
*********************/

int button = 8;
int led = 13;
int status = false;

void setup(){
pinMode(led, OUTPUT);
pinMode(button, INPUT_PULLUP); // set the internal pull up resistor, unpressed button is HIGH
}

void loop(){
//a) if the button is not pressed the false status is reversed by !status and the LED turns on
//b) if the button is pressed the true status is reveresed by !status and the LED turns off

if (digitalRead(button) == true) {
status = !status;
digitalWrite(led, status);
} while(digitalRead(button) == true);
delay(50); // keeps a small delay
}

Step 2: Another Revised Code Edition With Notes

/*********************

Simple toggle switch

Created by: P.Agiakatsikas

*********************/

int button = 8;

int led = 13;

int status = LOW;

void setup(){

pinMode(led, OUTPUT);

pinMode(button, INPUT_PULLUP); // setting the internal Pull up resistor of the button, that is HIGH

}

void loop(){

// Initially the button is unpressed and is HIGH (pull up) and is not equal to LOW therefore

// the inversion will be bypassed and the LED status will be LOW

//If the button is pressed its status will become LOW that means (a) status = (b) status

// Therefore status=!status will inverse and the LED will Light (HIGH)

if (digitalRead(button) == LOW) { /

status = !status;

digitalWrite(led, status);

} while(digitalRead(button) == LOW);

delay(50); // keep a small delay

}

Comments

[Dyso]

I changed it abit, see picture for pinning:

int button = 7;
int led = 12;
int status = false;
void setup(){
pinMode(led, OUTPUT);
pinMode(button, INPUT);
}
void loop(){
//a) if the button is not pressed the false status is reversed by !status and the LED turns on
//b) if the button is pressed the true status is reveresed by !status and the LED turns off
if (digitalRead(button) == true) {
status = !status;
if(status==1){
digitalWrite(led, HIGH);
}
else{
digitalWrite(led, LOW);
}
} while(digitalRead(button) == true);
delay(50); // keeps a small delay
}

[eski55596]

Can you please explain the use of INPUT_PULLUP.

[Mursy Jesse]

A great help, thanks! could you please xapin thw purpose of the "while" statemet at the end? i had to remove it as the code didnt seem to work with it in

[eski55596]

if the button is kept presses, WHILE Loop takes the charge and doesn't allow any further action but only after a little delay.

[pagaldunia]

HI,

Can we connect 8 push buttons to the Arduino Uno and Control 8 outputs as LED's ?

[JoshuaM285]

Thank you for this, but I noticed two things that should be corrected.

1. "int led = 3" is missing a ;

2. The LED in the diagram is backwards.

Great sample for a project I'm working on nonetheless. With a little troubleshooting I got it to work.