int pinswich = 2;
int ledpin = 13;

int state = LOW;
int a = LOW;

void setup(){
  Serial.begin(9600);
  Serial.setTimeout(20);
  pinMode(ledpin, OUTPUT);
  pinMode(pinswich, INPUT_PULLUP);
  
  digitalWrite(ledpin, LOW);
}

void loop(){
  while (digitalRead(pinswich) == HIGH)
  {
    a = HIGH;
    delay(10);
  }
  
  if ((a == HIGH) && (state == HIGH))
  {
    digitalWrite(ledpin, HIGH);
    Serial.println("on");
    state = LOW;
    a = LOW;
  }
  else if ((a == HIGH) && (state == LOW))
  {
    digitalWrite(ledpin, LOW);
    Serial.println("of");
    state = HIGH;
    a = LOW;
  }

}