//Created by William_L
//
//Receiver Code
//
//Purpose: 
//        The transmitter emits a specific code that is user defined by the variable pass[].
//        When the receiver detects that specific signal, an action is carried out
//        on the reciever end.
//Date: 23/12/2015

#include <VirtualWire.h>
#include <avr/io.h>

//recieving pin to the module is on 10
int receiving_pin = 12; 
char pass[]="home"; //change the value here to change the signal password
char control_relay = PD6;
int on_off=0;
int converted_pass;
int i;
int counter=0; //needs to be initialized outside of the loop

void setup() {

    //Data directions
    DDRD |= (1<<control_relay); //set pin as output
    PORTD |= (1<<control_relay); //off

    //initialize serial monitor
    Serial.begin(9600);

    //initialize virtual wire
    vw_set_rx_pin(receiving_pin);
    vw_set_ptt_inverted(true);
    vw_setup(2000);
    
    //start receiving data transmissions
    vw_rx_start();
  
}

void loop() {
      
    uint8_t buf[VW_MAX_MESSAGE_LEN];
    uint8_t buflen = VW_MAX_MESSAGE_LEN; 
 
      if (vw_get_message(buf, &buflen)) {
          for (i = 0; i< buflen; i++){
              converted_pass = pass[i]; //changing character to integer
              Serial.write(buf[i]);
              if (buf[i] == converted_pass){   //check to see if integers match
                  counter++;
              }
          }
          //Debugging info
          Serial.print("\n on_off value: ");
          Serial.print(on_off);
          Serial.print("       buflen: ");
          Serial.print(buflen);
          Serial.print("       counter: ");
          Serial.print(counter);
          Serial.println();
                   
          //if the signal picked up matches our password, turn on or turn off control relay
          if (counter == buflen){
              on_off = on_off + 1;            
              if (on_off == 1){                                 
                  PORTD &=~(1<<control_relay); //on
                  Serial.print(" ON");
                  Serial.println();        
                
              }
              else if (on_off == 2) {
                  PORTD |= (1<<control_relay); //off
                  on_off=0;
                  Serial.print(" OFF");
                  Serial.println();                                         
              }
              counter=0;
          }
           
      }
}