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Device Type:sensor
Electrical Standard:global
Board:bk72xx
Difficulty:Disassembly required (3/5)

Tuya YG400A-W Wifi Smoke Detector

This is currently about YG400A-W A008. The packaging states "Model No.: YG400A" but that may as well apply to different variants. Older models for instance seem to feature an esp (see the Tasmota device template page)

GPIO Pinout​

PinFunction
23Battery voltage
26Voltage divider
17Red Led
9Tamper button
15Smoke detection
28Reset button

Details mainly taken from this discussion at electroda.com. Thanks to the authors!