bool btnOnOff=0;
  bool _btnOnOff=0;
  bool led=0;
  bool rl1=0;
  void setup() {
  Serial.begin(115200);
  pinMode(2, OUTPUT);    
  pinMode(4, INPUT);  
  digitalWrite(2,HIGH);
  pinMode(12, OUTPUT);
  digitalWrite(12, HIGH);
}
void loop() {
  btnOnOff=digitalRead(4);
  int (btnOnOff==1 && btnOnOff==0);
  {
    _btnOnOff=1;
    led=!led;
    digitalWrite(2, led);
    digitalWrite(12, led);
  }
  if (btnOnOff==0 && _btnOnOff==1) _btnOnOff=0;
}