Just finished my 2nd revision of esptemp8c. I shrunk it down a bit to fit in a smaller enclosure, since I can actually monitor any # of probes using even just 1 header because it’s a 1-wire bus that supports many devices. 4 headers felt right because for me I wanted to be able to monitor my air exchanger, so that involves 4 probes - house return, house supply, outdoor return, outdoor supply. My furnace is just 2 probes, return air, and supply air - I can see my delta-T over the AC coil or the heater.
Also native USB-C flashing thanks to the ESP32-C3’s support for it, and still can be powered by 24VAC which is what HVAC uses.
Design is open source if you want to build your own, modify it, whatever - GitHub - gcormier/esptemp8c: n-channel thermocouple logger using esphome