Simplest code of Toggling the LED using Arduino

The most interesting thing in this code uses the default “running” keyword of Arduino. It is a library function in Arduino, also known as Boolean variable.

The Code

/*
 * Toggling the LED with a switch
 * Vidyasagar Academy Akola
 * www.vsa.edu.in
 */
 
 // The most intersting thing in this code uses 
the default "running" keyword of Arduino
 
int LED=3;
int Switch=1; // push-to-on switch connected between pin-1 & ground

bool running=false;

void setup() 
{
  pinMode(LED,OUTPUT);
  pinMode(Switch,INPUT);
  digitalWrite(Switch,HIGH);  // turn on pullup resistor
}

void loop() 
{
  if(digitalRead(Switch)==LOW) 
  {
    // switch is pressed - pullup keeps pin high normally
    delay(100); // delay to debounce switch
    running=!running; // toggle running variable
    digitalWrite(LED,running); // LED is ON
  }
}