An Arduino Sketch able to simulate a Somfy remote control
Arduino
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README.md Update README.md Dec 3, 2015
Somfy_Remote.ino Update Somfy_Remote.ino May 13, 2016

README.md

Somfy_Remote

An Arduino Sketch able to emulate a Somfy remote control.

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 current remote. I also ordered 433.42 MHz crystals to change the regular 433.92 MHz I have on my transmitter. 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.