//Created by William_L
//
//Transmitter 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>

//Button is hooked up on pin 10
//Transmission data is attached to pin 11 

const int transmission_pin = 12;
const int button = PD3;
const char pass[]="home"; //change the value here to change the signal password

void setup() {
    //data directions
    DDRD &= ~(1<<button); //button on pin3
    
    //initialize Virual wire
    vw_set_tx_pin(transmission_pin);
    vw_set_ptt_inverted(true); 
    vw_setup(2000);   //begin vw

    //initialize serial monitor
    initUSART();
}

void loop() {
    //continually check if button has been pressed 
    if ((PIND & (1<<button))==0){
        Serial.print("Button pressed \n");
        vw_send((uint8_t *)pass,strlen(pass));
        vw_wait_tx();
        delay(100);
    }
    else {
       Serial.print("nothing \n");
       delay(100);
    }

}