I bought a nest gen 2 thermostat to play with a open source project that revives old nest thermostats (https://nolongerevil.com/). Since I don’t want to install it into the home, because it will be a toy. I was thinking of building a test rig using a arduino or esp32 to simulate a HVAC and indoor temperature. I’m IT guy, not a HVAC guy, I think this would be a good learning project. Any suggestions?

  • Dave.@aussie.zoneEnglish
    7·
    13 hours ago

    If you’re just simulating the temperature there’s pretty much just three options:

    • The thermostat will simply command the HVAC system to maximum cooling, just like with any temperature well above the setpoint.
    • The thermostat will treat that value as a faulty sensor, report “error faulty sensor”, and not do much in particular.
    • The thermostat will crash due to an overflow of some sort as its software was never tested with inputs like that.

    Personally, I’d go with, “error faulty sensor” as the most likely outcome.

    (Edit: you can stimulate the temperature by setting your house on fire. Better to just simulate it)

    • batvin123@reddthat.comOPEnglish
      1·
      1 day ago

      I do want to stimulating the temperature. Also interesting theory, it would be cool to put it to the test. But I need some way to simulate a thermistor. Also, The testing rig I want to build could be a cool demonstration piece for how a thermostat works. I might donate it to some tech school when I’m done with it. Time will tell