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ihormelnyk / opentherm_library

Arduino/ESP8266/ESP32 OpenTherm Library for HVAC system control communication
MIT License
214 stars 93 forks source link

[HELP] OpenTherm Master Schematic #59

Open andreaconfa opened 9 months ago

andreaconfa commented 9 months ago

I all guys, i need a big help to make my project work.

I replicated the electrical schematic of the OpenTherm Master in my own board with an ESP32 but for some reason is not working (working fine using the opentherm master board that i bought from the website).

Here my schematic:

image

Here the component list: image

What could be wrong?

James3DA commented 3 months ago

Hmm, maybe R91 is too big for 3V3 ESP digital output. 330Ω I suppose is calculated for 5V Arduino digital out.