sense.ino

int sensor = 2; //one pin of sensor is connected to digital pin 2, the other is connected to 5volt.
int ledPin = 6; //longer pin of LED is connected to digital pin 6, the other is connected to ground through a resistor.

void setup() {
  Serial.begin(9600);
  pinMode(sensor, INPUT);
  pinMode(ledPin, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  int buttonState = digitalRead(sensor);
  //Serial.println(buttonState); //for debugging
  if(buttonState == HIGH)
  {
    digitalWrite(ledPin, LOW);
    /**********NOTE: Instead of the above line for turning on LED, use code for sending message.
    You can use a global variable (like sensor or ledPin), to make sure that only one message is sent
    when the sensor is touched once.
    ***********/
  }
  else
  {
    digitalWrite(ledPin, HIGH);
  }

  delay(200);        //wait for 200 milliseconds before sensing again
}