The things you listed sound a lot like a full home automation, even if it is just controlling the thermostat. All the sensors needed to detect presence, time, temperature, etc. can be done "simply" using something like Home Assistant (https://www.home-assistant.io/) and no cloud or even internet required for many configurations. There are many people that have built Open Source thermostats that tie into their systems and will control multiple zones based on presence, weather forecast, time of day, etc.
Beware, this is a deep rabbit hole, proceed with caution. On Fri, Jul 15, 2022 at 5:17 PM Tomas Kuchta <[email protected]> wrote: > On Fri, Jul 15, 2022, 17:04 Russell Senior <[email protected]> > wrote: > > > I have used a bunch of these: > > > > https://www.amazon.com/gp/product/B00T0K8NXC/ > > and > > https://www.amazon.com/gp/product/B01G7BE9WK/ > > > > with https://github.com/merbanan/rtl_433 and an rtlsdr (like this: > > https://www.amazon.com/gp/product/B00VZ1AWQA/) to decode. > > > > For improved accuracy, I calibrated the sensors in an icebath (in > > several layers of ziplock bags and desiccant) for 0 degrees offset. > > . > > > These are good sensors with great battery life. I also have ThermPro > sensors, they work, but the ones Russell lists are better, smaller and much > longer battery life. > > I do not calibrate them. I care about being comfortable and saving power > rather than worry about whether the temperature reading is 0.2-0.3 degrees > different from absolutely correct value. > > -T >
