Voltlog has designed an open-source hardware floor heating valve controller powered by an ESP32 WiFi module making it compatible with Tasmota open-source firmware, and by extension MQTT protocol and Home Assistant automation framework.
The board can control up to 10 valves triac controlled outputs and spring connectors for a floor home heating system, and also offers a one-wire srping connector, an I2C header, and safety features with two fuses, although it’s obviously not UL nor TUV certified.
Voltlog decided to design his own board instead of buying off-the-shelf solutions because of the high price of such products and the lack of open-source firmware for integration into a home automation server powered by Home Assistant. You can flash firmware to the ESP32 either through a VoltLink USB to Serial converter or you can use your own USB to serial converter module through the on-board JST-SH 1.0mm pitch 6 pin connector. This is only needed the first time, and after which the firmware can be upgraded over the air (OTA).
The KiCad hardware designed files are available on Github, and Voltlog explains more about the hardware design, including why the isolated AC/DC transformer is weirdly installed, as well as the whole reasoning for his design choices and the software used.
The “Tasmota ESP32 Floor Heating Valve Controller” is available on Tindie for $109.99, but there seems to be only one in stock at this time.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.