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#include <VirtualWire.h>
 
// LED's
const int ledPin = 13;
 
// Sensors 
const int Sensor1Pin = A2;
// const int Sensor2Pin = 3; 
 
int Sensor1Data;
//int Sensor2Data;
char Sensor1CharMsg[4]; 
 
void setup() {
 
 // PinModes 
 // LED 
 pinMode(ledPin,OUTPUT);
 // Sensor(s)
 pinMode(Sensor1Pin,INPUT);
 
 // for debugging
 Serial.begin(9600); 
 
 // VirtualWire setup
 vw_setup(2000);     // Bits per sec
 
 
}
 
void loop() {
  
  // Read and store Sensor 1 data
  Sensor1Data = analogRead(Sensor1Pin);
  
  // Convert integer data to Char array directly 
  itoa(Sensor1Data,Sensor1CharMsg,10);
  
  // DEBUG
  Serial.print("Sensor1 Integer: ");
  Serial.print(Sensor1Data);
  Serial.print(" Sensor1 CharMsg: ");
  Serial.print(Sensor1CharMsg);
  Serial.println(" ");
  delay(1000);
 
  // END DEBUG
 
 digitalWrite(13, true); // Turn on a light to show transmitting
 vw_send((uint8_t *)Sensor1CharMsg, strlen(Sensor1CharMsg));
 vw_wait_tx(); // Wait until the whole message is gone
 digitalWrite(13, false); // Turn off a light after transmission
 delay(200); 
 
} // END void loop...
 
Receiver: 
 
#include <VirtualWire.h>
 
// LED's
int ledPin = 13;
 
// Sensors 
int Sensor1Data;
 
// RF Transmission container
char Sensor1CharMsg[4]; 
 
void setup() {
  Serial.begin(9600);
  
  // sets the digital pin as output
  pinMode(ledPin, OUTPUT);      
    
    // VirtualWire 
    // Initialise the IO and ISR
    // Required for DR3100
    vw_set_ptt_inverted(true); 
    // Bits per sec
    vw_setup(2000);     
    
    // Start the receiver PLL running
    vw_rx_start();       
 
} // END void setup
 
void loop(){
    uint8_t buf[VW_MAX_MESSAGE_LEN];
    uint8_t buflen = VW_MAX_MESSAGE_LEN;
    
    // Non-blocking
    if (vw_get_message(buf, &buflen)) 
    {
    int i;
        // Turn on a light to show received good message 
        digitalWrite(13, true); 
    
        // Message with a good checksum received, dump it. 
        for (i = 0; i < buflen; i++)
    {            
          // Fill Sensor1CharMsg Char array with corresponding 
          // chars from buffer.   
          Sensor1CharMsg[i] = char(buf[i]);
    }
        
        // Null terminate the char array
        // This needs to be done otherwise problems will occur
        // when the incoming messages has less digits than the
        // one before. 
        Sensor1CharMsg[buflen] = '';
        
        // Convert Sensor1CharMsg Char array to integer
        Sensor1Data = atoi(Sensor1CharMsg);
        
        
        // DEBUG 
        Serial.print("Sensor 1: ");
        Serial.println(Sensor1Data);
        
        // END DEBUG
                
        // Turn off light to and await next message 
        digitalWrite(13, false);
    }
}
 
//Program to 

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