WARNING: Please check whether you can legally use RF transmitters and receivers at your location before attempting this project (or buying the components). This project is aimed at those who are looking to automate their home.
There are 4 parts to this tutorial:
- Part 1: Testing the 433 MHz RF transmitter and receiver
- Part 2: Receive and interpret code from an RF remote
- Part 3: Transmit a known 433 Mhz RF code to a 433 Mhz RF device
- Part 4: Record and play back a 433 Mhz RF remote signal - ** you are here **
To get the most out of this tutorial - it is best to start at tutorial Part 1, and then progress to Part 2 then Part 3 and then do Part 4 last. Doing the RF tutorials in this order will help you to understand the process better.
Project 4 : 433 Mhz RF remote replacement tutorial
Carrying on from my previous "433MHz transmitter and receiver" tutorials (1,2 & 3): I have thrown away the need to process the signal with a computer. This means that we can now get the Arduino to record the signal from an RF remote (in close proximity), and play it back in no time at all.
The Arduino will forget the signal when powered down or when the board is reset. The Arduino does not have an extensive memory - there is a limit to how many signals can be stored on the board at any one time. Some people have opted to create a "code" in their projects to help maximise the number of signals stored on the board. In the name of simplicity, I will not encode the signal like I did in my previous tutorials.
I will get the Arduino to record the signal and play it back - with the help of a button. The button will help manage the overall process, and control the flow of code.
Apart from uploading the sketch to the Arduino, this project will not require the use of a computer. Nor will it need a sound card, or any special libraries. Here are the parts required:
- Arduino UNO or compatible board
- Red and Green LED
- 330 ohm resistor(s)
- RF Module (433 Mhz) - Transmitter and Receiver pair or the 315 Mhz version
- Mercator Ceiling Fan/Light with Remote
Now let's see this project in action !Have a look at the video below to see the Arduino turning a light and fan on/off shortly after receiving the RF signal from the RF remote. The video will also show you how to put this whole project together - step by step.
Please let me know whether this worked for you or not.
I have not tested this project with other remotes or other frequencies - so would be interested to find out whether this technique can be used for ALL RF projects ??
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