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rvdbreemen / OTGW-firmware

A ESP8266 devkit firmware for the Nodoshop version of the Opentherm Gateway (OTGW)
MIT License
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Idea for new feature: Additional local temp sensors, e.g. one-wire DS18b22 #121

Closed fhennies closed 2 years ago

fhennies commented 2 years ago

Hej,

have you ever considered to add a local temp-sensor readout to the firmware, using one of the unused ESP pins? With the one-wire sensors one pin can serve several sensors. Using this would require a modification of the nodoshop pcb, but from what I can see this should be doable for several GPIOs (I have the old hardware).

Why would I or anyone want this? Our boiler is actually a heat exchanger for district heating, and some interesting values are not provided via OT, e.g. primary water temperature.

Thanks for reading, Franz

rvdbreemen commented 2 years ago

Franz, Yes we did, just go here: https://github.com/rvdbreemen/OTGW-firmware/wiki/Using-DSB1820-sensor-with-ESP-firmware

You can add as many sensors as you like, there are people that have a 10 sensors connected to a single GPIO. And it does not even require a hardware modification, as in the last revisions the PCB already has solder thruholes besides each wemos pins.

Hope this helps you,

Regards, Robert

fhennies commented 2 years ago

Thank you, thats great!