If you want to learn more about the Somfy RTS protocol, check out Pushstack.
How the hardware works: You will need:
-
An Arduino (works with an ESP8266 board and also with an ESP32 board)
-
A 433.42 Mhz RF transmitter. Generally you can't find a 433.42 MHz transmitter, so you need to buy a 433.92 MHz transmitter and replace its crystal by a 433.42 MHz crystal.
OR
-
A RFM69(H)(C)(W) transceiver
Note: the RFM69 module only accepts 3.3V power supply voltage. Be careful not to power it with 5V.
| Arduino Uno pin | RFM69 pin | AM transmitter pin | Wemos D1 mini | ESP32 |
|---|---|---|---|---|
| 10 | NSS | D8 | GPIO5 | |
| 11 | MOSI | D7 | GPIO23 | |
| 12 | MISO | D6 | GPIO19 | |
| 13 | SCK | D5 | GPIO18 | |
| 3 (user defined) | DIO2 | Data | D2 | GPIO16 |
| -- | 3V3(power+) | VCC (power+) | 3V3 | 3V3 |
| GND | GND (GND) | GND (GND) | GND | GND |
The Wemos D1 mini as an example for an ESP8266 board.
How the software works:
Install first the library in your libraries folder. Then you can simply create your own set of remotes in a sketch as follows:
SomfyRTS myRTS(3, TSR_RFM69);
where 3 is the pin you want to use to drive the transmitter and TSR_RFM69 is the transmitter type. The other choice is TSR_AM.
You are now ready to send commands to your Somfy RTS device. Example:
myRTS.sendSomfy(0, DOWN);
This emulates a press on the DOWN button on the remote controller 0. You can theoritically emulate up to 256 remotes. Of course, the first command you need to send is PROG to pair your remote with your device. Make sure your device is in pairing mode when doing this.
myRTS.sendSomfy(0, PROG);
The rolling code values are stored in the EEPROM, so that you don't loose count of your rolling code after a reset. In case of the ESP32 they are stored in persistant memory.