/*
Wireless communication 
Original project from http://www.swanrobotics.com
This project demonstrates wireless communication with an APC220 from http://www.dfrobot.com/
Sending and receiving data between a computer and an Arduino wireless.
On the computer the Serial Monitor from the Arduino software is used.
Control the LED with typing a '1' to turn the LED on and a '0' to turn it off.
The switch will send a message when change state.
The schematics for this project can be found on http://www.swanrobotics.com
This example code is in the public domain.
*/

// set pins:
const int switchPin = 3;     // pin number of the switch
const int ledPin =  2;       // pin number of the LED

// variables:
int switchState = 0;         // variable for reading switch status
int intSerialVal = 0;        // variable for reading Serial Value

// initialize
void setup() {
  // initialize LED pin as output:
  pinMode(ledPin, OUTPUT);      
  // initialize switch pin as input:
  pinMode(switchPin, INPUT);
  // initialize serial wireless communication:
  Serial.begin(9600);
  // read initial state of switch
  switchState = digitalRead(switchPin);
}

// program loop
void loop()
  {   
  // LED control
  intSerialVal = Serial.read();     // read user input
  switch (intSerialVal) {
    case '0':
      digitalWrite(ledPin,LOW);     // turn LED off
      Serial.println("Led Off");    // send message about LED
      break;
    case '1': 
      digitalWrite(ledPin,HIGH);    // turn LED on
      Serial.println("Led On");     // send message about LED
      break;
  } 

  // read switch state and print line if state has changed
  switch (digitalRead(switchPin)) { // read pin status
    case HIGH:
      if (switchState == LOW) {     // check if message has to be send
      Serial.println("Switch On");  // send message about switch
      switchState = HIGH;           // message has been send
      }
      break;
    case LOW:
      if (switchState == HIGH) {    // check if message has to be send
      Serial.println("Switch Off"); // send message about switch
      switchState = LOW;            // message has been send
      }
      break;  
  }
  }