A couple of updates on my smart home. Firstly, I've had a Nest thermostat for the past few years, it's been fine. Nothing outstanding but it worked well and did all that could be asked of it. But I moved house end of last year and our new house has dual zone heating, which either meant having the Nest only on one floor, buying a second one or looking at other options. I decided against buying another Nest as they're not exactly cheap, plus it's another thing running in the cloud which I don't really like. So I decided upon using Sonoff Basics to replace the thermostats, flashed with Tasmota and connected to Home Assistant giving me local control and using any temperature sensor I want, in this case I am using Aqara's Zigbee temperature sensors.
After getting my head around the wiring, got the two Sonoffs linked up to the system. The PSU on the right fitted also, more on that in a bit!
A quick demo on them working via Home Assistant.
https://i.imgur.com/iKp4Pr5.mp4
Now back to that PSU, I have wanted a wall mounted tablet for a long time for Home Assistant, and now was the perfect opportunity, and the reason for the PSU above, it's a 5v PSU and hooked up to the existing wiring for the old thermostats. Using an Amazon Fire 10 (7th Gen I think), with the battery ripped out and the power wires hooked up to where the battery was, to avoid any issues with the battery. It's running Fully Kiosk Browser, and uses the front camera to wake the screen when motion is detected.
I'm currently working on updating the dashboard but have at least got the thermostat controls available for now. The thermostats are also on timers via a schedule thanks to a community addon.
When I decided to go for a 'DIY Thermostat' I thought it was going to be a pain, but thanks to Home Assistant and its communuty, it's been an absolute breeze of a job. Now I have fully smart thermostats with local control. The sky is the limit with what you can do with it thanks to Home Assistant also, with geo location etc.