brainkiller/somfy_remote

An Arduino Sketch able to simulate a Somfy remote control

Somfy Remote

An Arduino Sketch able to emulate a Somfy remote control.

Difference with Nichduino/Somfy_Remote

This project aims to emulate multiple remote addresses and to make the arduino work using GPIO pins instead of serial input. This make the sketch usable for home automation without any OS.

The sketch is working with the rflink/arduino setup from nodo-shop.nl

Original Readme

If you want to learn more about the Somfy RTS protocol, check out Pushtack.

How the hardware works: Connect a 433.42 Mhz RF transmitter to Arduino Pin 5 (or change the pin in the sketch). I couldn't find a 433.42 MHz transmitter so I hacked a remote to send my signals. I then ordered 433.42 MHz crystals to change the regular 433.92 MHz ones I have on my transmitters: that's the cheapest way to do it. Other option would be to use a tunable transmitter (but that hardly looks like the easy way and I'm not a ham radio, so...).

How the software works: What you really want to keep here are the BuildFrame() and SendCommand() procedures. Input the remote address and the rolling code value and you have a remote. With the sketch, you can send the command through serial line but that would be easily modified to button press or whatever (I plan on running it on an internet-connected ESP8266 to shut the blinds at sunset every day).

The rolling code value is stored in the EEPROM, so that you don't loose count of your rolling code after a reset.