Arduino program to control equipments via the protocol SOMFY RTS or Chacon DiO.
This code has been tested on ESP8266 with RF 433.42 Mhz transmitter. The transmitter commonly sold have a 433.92 MHz crystal. You can buy 433.42 Mhz crystal and change it with a bit of soldering.
The code is based on the reverse engineering described in https://pushstack.wordpress.com/somfy-rts-protocol/.
The original code is https://github.com/Nickduino/Somfy_Remote.
There are many forks of this code on internet:
- https://github.com/marmotton/Somfy_Remote
- https://github.com/RoyOltmans/somfy_esp8266_remote_arduino that describes the required electronic parts.
- https://www.amazon.fr/gp/product/B00G23NW6S
- Many web sites describe the Chacon DIO protocol (https://caron.ws/diy-cartes-microcontroleurs/piloter-vos-prises-chacon-rf433mhz-arduino/).
This version is based on TOST Corp. code (2018 to 2020).
Modified by Stéphane Raimbault, 11/2020:
- MQTT Discovery for easy integration with Home Assistant
- a cover can be associated to many groups
- groups are exposed as remotes in Home Assistant
- simpler configuration (no rolling code, EEPROM addresses, etc)
- no dynamic allocation in loop() to avoid memory fragmentation
- faster code (remove many delays, fast path, pointers, pure string management, early return in functions)
- removed useless Ticker
- comments in english
- remove code to publish setup on weird server
- remove publishing of every handled commands on MQTT box topic
- DRY on many parts of the code
- common hostname/MQTT ID/MQTT topic for the box generated from MAC address
Copy the file config-default.h to config.h and edit it for your settings.
In the Arduino IDE, add support for the board:
File > Preferences- in field
Additional Boards Manager URLs:http://arduino.esp8266.com/stable/package_esp8266com_index.json - in the menu
Tools > Board > Boards manager, install the board ESP8266 [version 2.4.1 to have the board WeMos D1 R2 & mini]. Don't use the last version 2.7.4! - select the board WeMos D1 R2 & mini ou LOLIN (WEMOS) D1 R2 & mini.
- select the Port and speed 115200 bauds of the serial monitor.
After downloading the code in your box:
- Press the PROG button on the remote control of one of the your equipment, the shutter will make a back and forth movement up/down
- Send a "p" message to the MQTT server with the corresponding topic to the equipment
- Send a "u", "d" or "s" message to raise, lower or stop the shutter.
The rolling code value is stored in the EEPROM, so that you don't loose count of your rolling code after a power off or reset.