#define LED1 12
#define BT 14
int set = 0;

void setup() {

  pinMode(LED1, OUTPUT);
  pinMode(BT, INPUT);
}

void loop() {

  if(digitalRead(BT) == 1 && set == 0){
    digitalWrite(LED1, !digitalRead(LED1));
    set = 1;
  }
  if(digitalRead(BT) == 0 && set == 1){
    set = 0;
  }
  
  delay(10);
}