@Fozi Thanks man. I will look into the foil + microwave sensor. For movement detection a very narrow angle could be used, just in front of the mirror.

Regarding the microphone, how did you solve that?

@MilkShake Actually, I do not think that the ToF will work from behind a mirror, so I might have to go with the PIR.

Hi,
I am contemplating building a mirror with Google Assistant, but would like to get some input on the selected hardware. I do not like PIR as the sensor would be sitting in the frame and it would not look good imo.

I have a RPI4 for the job.

I have a small USB mic. I am hoping that it will be able to pick up voice, even though it is sitting behind the mirror.

I will play audio through a bluetooth speaker. Is this stable or should I use a small jack speaker instead?

For motion detection I bought the ToF unit VL53L1X. That should work from inside the mirror and thus nothing will be visible on the outside. Has anyone used this before for motion detection?

Really hoping for some input.

Best Regards