[PDF] Complete Guide for RF 433MHz Transmitter/Receiver Module With





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.

Complete Guide for RF 433MHz

Transmitter/Receiver Module With

Arduino

65 Shares

This post is a guide for the popular RF 433MHz Transmitter/Receiver modules with can apply to use in your own projects.

Description

FS1000A transmitter and corresponding receiver,

but the instructions provided also work with other 433MHz transmitter/receiver modules that work in a similar fashion. These RF modules are very popular among the Arduino tinkerers and are used on a wide variety of applications that require wireless control. These modules are very cheap and you can use them with any microcontroller (MCU),

Specifications RF 433MHz Receiver

Frequency Range: 433.92 MHz

Modulation: ASK

Input Voltage: 5V

Price: $1 to $2

Specifications RF 433MHz Transmitter

Frequency Range: 433.92MHz

Input Voltage: 3-12V

Price: $1 to $2

Arduino with RF 433MHz

Transmitter/Receiver Modules

In this section we build a simple example that sends a message from an Arduino to another using 433 MHz. An Arduino board will be connected to a 433 MHz transmitter a 433 MHz receiver to receive the messages. You need the following components for this example:

2x Arduino read Best Arduino Starter Kits

RF 433MHz Receiver/Transmitter

Breadboard

Jumper wires

You can use the preceding links or go directly to MakerAdvisor.com/tools to find all the parts for your projects at the best price!

Installing the RadioHead Library

The RadioHead library provides an easy way to work with the 433 MHz transmitter/receiver with the Arduino. Follow the next steps to install that library in the

Arduino IDE:

1. Click here to download the RadioHead library. You should have a .zip folder in

your Downloads folder.

2. Unzip the RadioHead library.

3. Move the RadioHead library folder to the Arduino IDE installation libraries folder.

4. Restart your Arduino IDE

The RadioHead library is great and it works with almost all RF modules in the market. You can read more about the RadioHead library here.

Transmitter Circuit

Wire the transmitter module to the Arduino by following the next schematic diagram.

Note: always check the pinout for the tr

datasheet.

Transmitter Sketch

Upload the following code to the Arduino board.

#include #include // Not actually used but needed to compile

RH_ASK driver;

void setup()

Serial.begin(9600); // 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);

How the transmitter sketch works

First, we need to include the RadioHead ASK library. #include This library needs the SPI library to work. So, we also need to include the SPI library. #include After that, we create a RH_ASK object called driver. In the setup() we initialize the RH_ASK object by using the init() method. We use an ifstatement and a print in the Serial Monitor for debugging purposes.

Serial.begin(9600); // Debugging only

if (!driver.init())

Serial.println("init failed");

In the loop(), we write and send our message. Here, our message is saved on the msgvariable. Please note that the message needs to be a char type. const char *msg = "Hello World!"; want as long as it is in char format.

Finally, we send our message as follows:

driver.send((uint8_t *)msg, strlen(msg)); driver.waitPacketSent(); The message is being sent every second, but you can adjust this delay time. delay(1000);

Receiver Circuit

Wire the receiver module to another Arduino by following the next schematic diagram. Note labels next to the pins. datasheet.

Receiver Sketch

Upload the code below to the Arduino connected to the receiver. #include #include // Not actualy used but needed to compile

RH_ASK driver;

void setup()

Serial.begin(9600); // Debugging only

if (!driver.init())

Serial.println("init failed");

void loop() uint8_t buf[12]; 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);

How the receiver sketch works

Similarly to the previous sketch, you start by including the necessary libraries: #include #include

You create a RH_ASK object called driver:

RH_ASK driver;

In the setup(), we initialize the RH_ASK object.

void setup(){

Serial.begin(9600); // Debugging only

if (!driver.init())

Serial.println("init failed");

In the loop()

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