About
This adapter is designed to connect an OpenTherm compatible boiler to any TTL port (TTL-USB, ESP8266, ESP32, Arduino, etc).
Same size as popular RS485-TTL module for more compatibility.
As software part you can use:
- OpenTherm gateway for HomeAssistant - very intelligent OT control firmware 🧠
- Tasmota OpenTherm - perhaps the easiest way to connect the boiler to your smart home system 🏚
- Opentherm IO library for Arduino or OpenTherm Arduino/ESP8266 Library (slave mode only)
if you want to build your own firmware 🛠
Overview
Photos
Schematic
Where to buy?
DIY
- iBOM page 🌍
- Gerber zip 🗂
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License
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