Use Arduino with RF Modules

Hi guys, today I'm here with a really cool project.
If you have ever wondered how to make 2 arduinos communicates without using expensive shield, here is the solution: there are some RF modules sold for about 2$ (transmitter + receiver)  that offer one way, easy-to-use communication with a range of about 150 meters.
In this post I'll explain how to use this modules.

First of all you'll need:
-2 arduinos
-a rf transmitter
-a rf receiver

STEP 1: the transmitter
Connect the transmitter to arduino this way:

Upload this code to the arduino connected to the transmitter:
 
#include <VirtualWire.h>
void setup(){
  vw_setup(2000); // bps
  }
void loop(){
  send("hello world"); //your message
  delay(1000);
  }
void send (char *message){
  vw_send((uint8_t *)message, strlen(message));
  vw_wait_tx();
  }
STEP 2: the receiver
Connect the receiver to the arduino this way:

Upload this code to the arduino connected to the receiver:

#include <VirtualWire.h>
byte message[VW_MAX_MESSAGE_LEN];
byte messageLength = VW_MAX_MESSAGE_LEN;
void setup(){
  Serial.begin(9600);
  Serial.println("Device is ready");
  vw_setup(2000); //bps
  vw_rx_start();
  }
void loop(){
  if (vw_get_message(message, &messageLength)){
    Serial.print("Received: ");
      for (int i = 0; i < messageLength; i++){
        Serial.write(message[i]);
        }
      Serial.println();
    }
  }
STEP 3: test ;)
Connect the 2 arudino and check with the serial monitor if it works

I hope you like this post, if you have any question please comment or send me an email to damianoandre@gmail.com

Bye, Dami