#define PIN_IO 12

int touch_val = 0;
void setup() {
  pinMode(PIN_IO,INPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  
  Serial.begin(115200);
}

void loop() {
  touch_val = digitalRead(PIN_IO);
  digitalWrite(LED_BUILTIN,touch_val);
  if(touch_val == HIGH){
    Serial.println("BS=1");
    Serial.write(1);
  }else{
    Serial.println("BS=0");  
    Serial.write(1);
  }
  delay(1000);
}