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This Article aims to be a comprehensive guide to the popular RF 433MHz Transmitter/Receiver modules. Information on how they work, some features, and an Arduino project example that you can take and apply to other projects. Description These RF modules are very popular among the Arduino tinkerers. The 433MHz is 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).

Elwave 10e patch. 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 Where to buy? You can purchase these modules from eBay for just a few dollars. Arduino with RF 433MHz Modules You need the following components to make this circuit: • 2x Arduino () • RF 433MHz Receiver/Transmitter () • Breadboard () Library download Here’s the library you need for this project: • Download the • Unzip the RadioHead library • Install the RadioHead library in your Arduino IDE • 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 this project.

Receiver Circuit Follow the circuit above for your receiver. Then upload the code below. } Demonstration In this project the transmitter is sending a message “Hello World!” to the receiver via RF. Those messages are being displayed in the serial monitor from the receiver. Here’s what you should see in your Arduino IDE serial monitor.

Conclusion You need to have some realistic expectations when using this module. They work very well when the receiver and transmitter are close to each other. If you separate them too far you’ll loose the communication. The communication range will vary.

It depends on how much voltage that you’re supplying to your transmitter module, RF noise in your environment and if you’re using an external antenna.