int buttonPin = 8;
int buttonState = 0;

void setup() {
  pinMode(buttonPin, INPUT);
  Serial.begin(38400); // Default communication rate of the Bluetooth module
}

void loop() {
 int buttonState = 0;
 delay(100);
 buttonState = digitalRead(buttonPin);
 if (buttonState == HIGH) {
   Serial.write('0'); // Sends '1' to serialout
 }
 else {
   Serial.write('1');
 }
}