Arduino & 433MHz RF Transmitter and Receiver.

A quick start guide on using these inexpensive 433MHz RF transmitter and receiver pairs with an Arduino.

This page includes all the pinouts and code needed to send a simple “hello world” message in order to test your equipment.

The first photo shows the general test setup with a pair of Arduino Nanos connected to their specific module.

The second photo gives the pinout. The labelling on the transmitter is misleading. The VCC is the CENTRE PIN, not the right hand pin. The rightmost pin, is labelled ATAD (reverse of DATA)

Transmit

//TX 433MHZ

#include <RH_ASK.h>
#include <SPI.h> // Not actually used but needed to compile

RH_ASK driver;

void setup()
{
    Serial.begin(115200);    // Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
    const char *msg = "Hello World!";
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitPacketSent();
    delay(1000);
}

Receive

//RX 433MHZ

#include <RH_ASK.h>
#include <SPI.h> // Not actualy used but needed to compile

RH_ASK driver;

void setup()
{
    Serial.begin(115200);  // Debugging only
    if (!driver.init())
         Serial.println("init failed");
}

void loop()
{
    uint8_t buf[11];
    uint8_t buflen = sizeof(buf);
    if (driver.recv(buf, &buflen)) // Non-blocking
    {
      int i;
      // Message with a good checksum received, dump it.
      Serial.print("Message: ");
      Serial.println((char*)buf);         
    }
}