Code Library: B : Button-to-Switch

Button to Switch

/* This piece of code changes a button to a switch
 * Presses of the button switches between ON and OFF
 */

const int inPin = 2;
const int outPin = 6;

int state = HIGH;
int reading;
int previous = LOW;

long time = 0; //longs, because when measured in ms they quickly become to large for ints
long debounce = 200;

void setup()
{
  pinMode(inPin, INPUT);
  pinMode(outPin, OUTPUT);
}

void loop()
{
  reading = digitalRead(inPin);

  if (reading == HIGH && previous == LOW && millis() - time > debounce)
  {
    if (state == HIGH)
      state = LOW;
    else
      state = HIGH;

    time = millis();
  }
  digitalWrite(outPin, state);
  previous = reading;
}