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[HELP] OpenTherm Master Schematic #59

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andreaconfa opened this issue Dec 27, 2023 · 1 comment
Open

[HELP] OpenTherm Master Schematic #59

andreaconfa opened this issue Dec 27, 2023 · 1 comment

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

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@andreaconfa @James3DA