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Arduino and RF transmitter and receiver modules

This is a simple example for an RF transmitter and reciever, these come in a couple of flavours the pair I had  operate at 315Mhz.

These modules are readily available and look like this

433Mhz-Pair-Top

Specs RF  Receiver

1. Product Model: MX-05V
2. Operating voltage: DC5V
3. Quiescent Current: 4mA
4. Receiving frequency:315Mhz
5. Receiver sensitivity:-105DB

Specs RF  Transmitter

1. Product Model: MX-FS-03V
2. Launch distance :20-200 meters
3. Operating voltage :3.5-12V
4. Operating mode: AM
5. Transfer rate: 4KB / S
6. Transmitting power: 10mW
7. Transmitting frequency: 315Mhz

You will need an Arduino to be the transmitter and one to be the receiver. I used a Nano as transmitter and an Uno for receiver. This just made it easier to program the correct Arduino.

Schematic

315mhz transmitter receiver_schem

Code

These need the VirtualWire library to be installed, get it from http://www.pjrc.com/teensy/td_libs_VirtualWire.html

 

Transmitter code

#include <VirtualWire.h>
 
int RF_TX_PIN = 4;
 
void setup()
{
  vw_set_tx_pin(RF_TX_PIN); // Setup transmit pin
  vw_setup(2000); // Transmission speed in bits per second.
}
 
void loop()
{
  const char *msg = "hello world";
  vw_send((uint8_t *)msg, strlen(msg));  // Send 'hello' every 400ms.
  delay(400);
 
}

 

Receiver code

#include <VirtualWire.h>
 
int RF_RX_PIN = 4;
 
void setup()
{
  Serial.begin(9600);
  Serial.println("setup");
  vw_set_rx_pin(RF_RX_PIN);  // Setup receive pin.
  vw_setup(2000); // Transmission speed in bits per second.
  vw_rx_start(); // Start the PLL receiver.
}
 
void loop()
{
  uint8_t buf[VW_MAX_MESSAGE_LEN];
  uint8_t buflen = VW_MAX_MESSAGE_LEN;
  if(vw_get_message(buf, &buflen)) // non-blocking I/O
  {
    int i;
    // Message with a good checksum received, dump HEX
    Serial.print("Got: ");
    for(i = 0; i < buflen; ++i)
    {
      Serial.print(buf[i], HEX);
      Serial.print(" ");
    //Serial.print(buf[i]);
    }
    Serial.println("");
  }
}

 

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