void setup() {
  
  pinMode(3, INPUT);
  pinMode(2, OUTPUT);

}

bool sw_pressOut = 0;
bool mode = 0;

void loop() {
  
  if((digitalRead(3) == HIGH)) {
    if(sw_pressOut == 0) {
      mode = !mode;
      sw_pressOut = 1;
    }
  } else {
    sw_pressOut = 0;
  }

  if(mode == 1) {
    digitalWrite(2, HIGH);
  }else{
    digitalWrite(2, LOW);
  }
  delay(10);
}