Arduino Gun Transmitter Sketch

//sender

#include <VirtualWire.h> //library for simple wireless communication

const int triggerPin = 2; //defining which input pins do what
const int clipPin = 4;

int triggerState = 0; //the variables holding the state of the switches
int clipState = 0;

int lastTriggerState=0; //these variables are used to determine if the
int lastClipState=0;    //switch state has changed since the last check

void setup()
{
  vw_setup(2000); // bits per sec, specific to transmitter
  vw_set_tx_pin(12); //transmitter pin
  pinMode(triggerPin,INPUT); //defining input pins
  pinMode(clipPin,INPUT);
  Serial.begin(9600); //for testing
}

void loop()
{
  char str[8]; //the string that will be sent wirelessly
  triggerState = digitalRead(triggerPin); //check the trigger pin
  if(triggerState == HIGH)
  {
   strcpy (str,"1"); //if it's pressed, we send a "1"
  }
  else
  {
    strcpy (str,"0"); //otherwise, send a "0"
  }
  strcat (str,"  "); //this adds a space between the two sent values
  clipState = digitalRead(clipPin); //check the magazine pin
  if(clipState == HIGH)
  {
   strcat (str,"1"); //if it's pressed, send "1", like before
  }
  else
  {
    strcat (str,"0");
  }
  if(lastTriggerState!=triggerState||lastClipState!=clipState)
  {             //this makes sure we only send data if it's not the exact
    send(str);  //same as it was before, that would be redundant.
  }             //send is a defined function below
  lastTriggerState=triggerState;
  lastClipState=clipState;
}

void send (char *message)
{
  Serial.println(message); //print to the serial port, for testing
  vw_send((uint8_t *)message, strlen(message)); //send the string out
  vw_wait_tx(); // wait until the whole message is gone
}