@rieschard
The 2-terminal green block on the PCB is A+ en B-. I wanted to have it on the side instead of the top.
Gnd is not necesarry for the modbus RTU. (power levels between A en B, not A, B and GND)
V1 can be connected through usb port on front of the brink.
The Brink also has 24VDC on the terminals, thats why i made a V2.
Also Brink is missing the RH and temp from suction side from house and i wanted to have a possibillity to connect another sensor for example a SCD41 for CO2 measurement.
The relais can be used for a zone steering (valves). Just some future ideas.
Send me an email through alphonsuijtdehaag at gmail dot com if you are interested in a pcb
Edit: some pictures of V2:
I have put an advertisement now on Tweakers website for version 2
ESP32 PCB incl relais, modbus, one-wire, i2c connectoren aangeboden - Vraag & Aanbod - Tweakers