int led = false;
int press_key = false;


void setup() {
  // put your setup code here, to run once:
pinMode(12, OUTPUT);
pinMode(3, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
int key = digitalRead(3);
if (key && !press_key){
  press_key = true;
  delay(50);
}

if (!key && press_key){
  press_key =true;
  delay(50);
  led = !led;
}


digitalWrite(12, led);
}