A simple example of using OpenTherm gateway to monitor central heating parameters. Serves a webpage showing all OpenTherm messages between the thermostat and the boiler, and publishes the central heating parameters to a MQTT broker on your local network.
Forked from https://github.com/diyless/opentherm-gateway-simple and modified as follows:
- Project file structure changed from
Arduino IDEtoPlatformIO / VSCode IDE SupportRemoved support for ESP8266. Supports only ESP32.FunctionalityPublishes central heating parameters to a MQTT broker on your local network. For use in, e.g., Home Assistant.FunctionalityEnabled over-the-air (OTA) firmware updates viahttp://.../update.FunctionalityAdded a boiler communication timeout check. It will email an alert and reset the ESP.WebpageRemoved the ThingSpeak and ApexCharts live graphs.WebpageNeater OpenTherm log using human-readable values.WebpageDark theme.CodeRefactored variable names to mimic OpenTherm protocol.CodeCleaned up redundant code.CodeUsing character arrays in favor of Strings.CodeRemoved thedisable CHanddisable DHWmanual overrides.CodeAdded explanatory comments.FixReport correctFlamestatus.
My Wemos D1 Mini32 board (Lolin) with ESP-WROOM-32 chipset is reporting Brownout detector was triggered. This is very likely the cause for the intermittent hangs I have been experiencing. Users on the
internet (arendst/Tasmota#19886) report on a weak
3.3V LDO regulator on board of the Wemos, triggering the voltage brownout
warning. Either replace it with one sustaining 500 mA, or try adding a 1000 uF
capacitor to the existing LDO.
Existing LDO on my Wemos D1 Mini32 board:
- RT9193-33GB (SOT23-5 package, marking DE=A1D): 3.3 V, 300 mA
Suggested pin-compatible replacement:
- RT9013-33GB (SOT23-5 package): 3.3 V, 500 mA
Brownouts resolved by keeping the original LDO and adding a 1000 uF, 6.3V electrolytic capacitor over the 3.3V and GND pins instead.