Toggle a Relay by Single Pushbutton with Arduino

//Anokhautomation

//https://github.com/anokhramesh/Toggle-Relay-by-push-Button

//Toggle an LED with a Push button-follow  the circuit diagram

int led = 12;//connect Led to digital pin 12 of Arduino

int button = 11;// connect push button to digital pin 11 of Arduino, connect a10k pull down resistance to ground .

int ledState = LOW;// at initial led status is OFF

int buttonCurrent;// cteaed an integer variable name buttonCurrent 

int buttonPrevious = LOW;// default state of button is LOW 

void setup()

{

  Serial.begin(9600);//baud rate of serial communication

  pinMode(button, INPUT);//Pin 11 is assigned to receive an INPUT Value

  pinMode(led , OUTPUT);//Pin 12 is assigned to deliver  an OUTPUT Value

}

void loop() {

  buttonCurrent = digitalRead(button);// the variable( buttonCurrent) will store the value of button

  if (buttonCurrent == HIGH && buttonPrevious == LOW)

  {

    if (ledState == HIGH) {

      ledState = LOW;

    }

    else {

      ledState = HIGH;

    }

  }

  digitalWrite(led, ledState);

  //Serial.println(ledState);

  buttonPrevious = buttonCurrent;

  delay(100);

}