ihormelnyk/opentherm_library

[HELP] OpenTherm Master Schematic

Opened this issue · 1 comments

andreaconfa commented

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

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