/*
  Arduino Starter Kit example
  Project 13 - Touch Sensor Lamp

  This sketch is written to accompany Project 13 in the Arduino Starter Kit

  Parts required:
  - 1 megohm resistor
  - metal foil or copper mesh
  - 220 ohm resistor
  - LED

  Software required :
  - CapacitiveSensor library by Paul Badger
    http://www.arduino.cc/playground/Main/CapacitiveSensor

  created 18 Sep 2012
  by Scott Fitzgerald

  http://www.arduino.cc/starterKit

  This example code is part of the public domain.
*/

// import the library (must be located in the Arduino/libraries directory)
#include <CapacitiveSensor.h>

// create an instance of the library
// pin 4 sends electrical energy
// pin 2 senses senses a change
CapacitiveSensor capSensor = CapacitiveSensor(4, 2);

// threshold for turning the lamp on
int threshold = 1000;

// pin the LED is connected to
const int ledPin = 12;


void setup() {
  // open a serial connection
  Serial.begin(9600);
  // set the LED pin as an output
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // store the value reported by the sensor in a variable
  long sensorValue = capSensor.capacitiveSensor(30);

  // print out the sensor value
  Serial.println(sensorValue);

  // if the value is greater than the threshold
  if (sensorValue > threshold) {
    // turn the LED on
    digitalWrite(ledPin, HIGH);
  }
  // if it's lower than the threshold
  else {
    // turn the LED off
    digitalWrite(ledPin, LOW);
  }

  delay(10);
}
