ATMega328p, 32768Hz xtal, in a smart radiator valve. See OpenTRV (for the open part of the s/w and h/w) and Radbot for the commercial product.
That's a cool product! I wish I could put something like that on my hydronic (hot water) radiators, but they don't have individual valves.
That's a cool product! I wish I could put something like that on my hydronic (hot water) radiators, but they don't have individual valves.