Hello, I am a newbie in this place. I have a problem, I bought a tuya PIR Motion Sensor, so I want to know how I can add it to the HA, because I connect through the smart life app and the device does not come up.
Simple but disappointing answer: You can´t. For some weird reasons, the Tuya integration still doesn´t support sensors of all kinds.
But maybe it is possible to reflash the sensor using tasmota or esphome…
If you’re not afraid of tinkering, defense worth a try 
If you’re lucky, you can re-flash it by OTA, otherwise e you’ll need a serial interface to re-flash it
It’s now supported along with the water leak sensor 
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