RF Wireless Receiver and Transmitter Module Board for Arduino 433Mhz DC 5V COM35, R24

Specifications RF 433MHz Receiver

• Voltage:DC5V
• Current:4MA
• Frequency:433.92MHZ
• Sensitivity:-105DB
• Antenna:32CM single core wire,heliciform shaped
    

Getting started with the RF wireless receiver module & transmitter module board for arduino 433Mhz DC5V

In this section, we’ll build a simple example that sends a message from an Arduino to another Arduino board using 433 MHz. An Arduino board will be connected to a 433 MHz transmitter and will send the “Hello World!” message. The other Arduino board will be connected to a 433 MHz receiver to receive the messages.

Step1: Hardware required

• Arduino UNO
• Breadboard
• Jumper wires
• 433MHz RF Transmitter and   Receiver

Step2: Connecting the Hardware

The wiring for the transmitter is fairly simple. It has only three connections. Connect the VCC pin to 5V pin and GND to ground on the Arduino. The Data-In pin should be connected to Arduino’s digital pin #12. You should try and use pin 12 as by default the library we’ll be using in our sketch uses this pin for data input.

Once you have the transmitter wired you can move on to the receiver. The wiring for the receiver is just as easy as the transmitter was.

Once again there are only three connections to make. Connect the VCC pin to 5V pin and GND to ground on the Arduino. Any of the middle two Data-Out pins should be connected to digital pin #11 on the Arduino.

Now that both the transmitter and receiver are wired up we will need to write some code and send it to the respective Arduino boards.  Since you probably have only one PC, we will start with the transmitter. Once the code has been loaded there, we’ll move on to the receiver. The Arduino to which transmitter is connected can then be powered using a power supply or battery.

Step3: Setting up the library

Before we start coding, there is a library called RadioHead we will need to install into our Arduino IDE that will make writing the code a lot simpler.

RadioHead is a library that allows simple data transfer between Arduino boards. It’s so versatile that it can be used to drive all sorts of radio communications devices, including our 433MHz modules.

You can download the library, just click this RadioHead.Zip to download the zip: RadioHead.Zip

To install it, open the Arduino IDE, go to Sketch > Include Library > Add .ZIP Library, and then select the RadioHead file that you just downloaded.

Step4: Upload the sample sketch

In our experiment we will just send a simple text message from the transmitter to the receiver. It will be helpful to understand how to use the modules and can serve as the basis for more practical experiments and projects.

Here is the sketch we will be using for our transmitter:

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

RH_ASK driver;
// RH_ASK driver(2000, 2, 4, 5); // ESP8266 or ESP32: do not use pin 11

void setup()
{
Serial.begin(9600); // Debugging only
if (!driver.init())
Serial.println("init failed");
}

void loop()
{
const char *msg = "hello";

driver.send((uint8_t *)msg, strlen(msg));
driver.waitPacketSent();
delay(200);
}

Connect the receiver Arduino to the computer and load the following code:

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

RH_ASK driver;
// RH_ASK driver(2000, 2, 4, 5); // ESP8266 or ESP32: do not use pin 11

void setup()
{
Serial.begin(9600); // Debugging only
if (!driver.init())
Serial.println("init failed");
}

void loop()
{
uint8_t buf[5];
uint8_t buflen = sizeof(buf);

if (driver.recv(buf, &buflen)) // Non-blocking
{
int i;

// Message with a good checksum received, dump it.
//driver.printBuffer("Got:", buf, buflen);
String msg="Message: ";
Serial.println(msg+(char*)buf);
}
}

Step5: Testing the circuit

After loading the sketch open your serial monitor. If all is OK you should see your message.