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Hello folks, I am here with a simple and interesting arduino project, RF based wireless Message Transmitting system. By using this system you can feed the data to be transmitted serially to the transmitter from your PC. The project mainly consisting of a Transmitter and a  receiver section. Transmitter is made by Arduino Uno board and receiver is made by Arduino Mega2560. The communication between transmitter and receiver is through RF, Amplitude Shift Keying. (More about Binary Frequency shift keying)  This wireless transmitter and receiver pair operates in 433Mhz. Only one way of communication is possible through this system, the received message will be displayed on a 16x2 alpha-numeric liquid crystal display. The receiving section updates the display whenever a new message arrives from 433Mhz RF transmitter.



Circuit Diagram of Transmitter









wireless message transmitter

wireless transmitter section




Receiver Section Circuit Diagram


wireless message receiver

wireless message receiver



Program - Transmitter

#include <VirtualWire.h>
char inData[30];
char inChar;
byte index = 0;
void setup()
{
vw_setup(2000); // Bits per sec
Serial.begin(9600);
}
void loop()
{
  
 

 while(Serial.available() > 0)
  {
   
      if(index<30)
      {
          inChar = Serial.read();
          inData[index] = inChar;
          index++;
          inData[index] = '\0';
      }
  
  }
     
    Serial.println(inData);
    send(inData);
index=0;
  
       }
     
delay(100);
}
void send (char *message)
{
vw_send((uint8_t *)message, strlen(message));
vw_wait_tx(); // Wait until the whole message is gone
}



Program - Receiver


#include <VirtualWire.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(22, 23, 24, 25, 26, 27, 28);
byte message[VW_MAX_MESSAGE_LEN]; // a buffer to store the incoming messages
byte messageLength = VW_MAX_MESSAGE_LEN; // the size of the message
void setup()
{
  Serial.begin(9600);
  vw_setup(2000); // Bits per sec
  vw_rx_start(); // Start the receiver
}
void loop()
{
  if (vw_get_message(message, &messageLength)) // Non-blocking
  {
    lcd.clear();
    for (i = 0; i<messageLength; i++)
    {
      message[i];
      Serial.write(message[i]);
      lcd.write(message[i]);
    }
    for (i = 0; i<messageLength; i++)
    {
     message[i]=NULL;
    }
    messageLength = 16;
  }
}



Download VirtualWire Header File. 

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