//jleblanc 12.02.06 (based on Rob Faludi rob@faludi.com)
//SEND with Sleep

//Variables//////////////////////////////////////
  // serial out is on port 1
  // serial in is on port 0
  int switchPin = 12;// a digital input is on port 12
  int ledPin = 13;// a status light is on port 13
  int sleepPin = 2; //Used to control sleep

  // a byte to send out data:
  char thisByte = 0;


void setup () 
{
  // set pins to input and output appropriately
  pinMode(ledPin, OUTPUT);
  pinMode(switchPin, INPUT);
  pinMode(sleepPin, OUTPUT);

  // start up the serial connection with 9600-8-n-1-true (non-inverted):
  Serial.begin(9600);

  // blink the status LED
  blinkLED(ledPin, 3);

  // for some reason it seems to help to send an arbitrary character first
  //then pause for the guard time before requesting command mode
  Serial.print("X");
  delay(1100);
  // put the XBee in command mode
  Serial.print("+++");
   delay(1100);
  // wait for a response from the XBee for 2000 ms, or start
  // over with setup if no valid response comes
 
  if (returnedOK() == 'T') {
    // if an OK was received then continue 
  }
  else {
    setup(); // otherwise go back and try setup again
  }
  
  //See Rob's original code for explanation on this command to the XBee
  //I have added the SM command to indicate which sleep mode to use
   Serial.println("ATID3330,DH0,DL1,SM1,CN");
   
  // wait for a response from the XBee for 2000 ms, or start
  // over with setup if no valid response comes
  
   if (returnedOK() == 'T') {
    // if an OK was received then continue 
  }
  else {
    setup(); // otherwise go back and try setup again
  }

}


void loop () 
{
  //Wake up the XBee
    digitalWrite(sleepPin, LOW);
    delay(15); //pause to let it wake up
  // read the switch:
    thisByte = digitalRead(switchPin);
  // convert it to a readable ASCII value, send it out the serial port:
    Serial.print(thisByte, DEC);
    delay(10);
  
  //Put the XBee to sleep
    digitalWrite(sleepPin, HIGH);
    delay(10000); //Wait 10 seconds
  
}


//USED FUNCTIONS/////////////////////////////////////////////////

char returnedOK () {
  // this function checks the response on the serial port to see if it was an "OK" or not
  char incomingChar[3];
  char okString[] = "OK";
  char result = 'n';
  int startTime = millis();
  while (millis() - startTime < 2000 && result == 'n') {  // use a timeout of 10 seconds
    if (Serial.available() > 1) {
      // read three incoming bytes which should be "O", "K", and a linefeed:
      for (int i=0; i<3; i++) {
        incomingChar[i] = Serial.read();
      }
      if ( strstr(incomingChar, okString) != NULL ) { // check to see if the respose is "OK"
//      if (incomingChar[0] == 'O' && incomingChar[1] == 'K') { // check to see if the first two characters are "OK"
        result = 'T'; // return T if "OK" was the response
      }  
      else {
        result = 'F'; // otherwise return F
      }
    }
  }
  return result;
}

void blinkLED(int targetPin, int numBlinks) {
  // this function blinks the status LED light as many times as requested
  for (int i=0; i<numBlinks; i++) {
    digitalWrite(targetPin, HIGH);   // sets the LED on
    delay(250);                     // waits for a second
    digitalWrite(targetPin, LOW);    // sets the LED off
    delay(250);
  }
}