The W1209 is a simple very cheap relay thermostat that used to come with TM8S003F3P6 or another unmarked micro-controller in TSSOP20 casing. On this board I recently purchased from Aliexpress the micro-controller is in QFN24 casing and the LDO on the board is now changed to AMS1117-3.3 (instead of the HT7150 on my previous boards) which means it works on 3.3V. The marking on the board is 808D G00G2 1617+.
January 18, 2022
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