Can you help me identify this board?
The device in the centre looks like a PIR (passive infrared) sensor. This was recently discussed in Can we use pir sensor while it&#39;s moving?.



Figure 1. Modified sensing diagram. A pair of side-by-side PIR sensors in reverse-series connection sense motion while giving high immunity to changes background radiation due to temperature changes. Image source: MakerGuides article and modified by me.

A pair of reverse-series connection that walking into the purple detection zone would generate a positive going pulse and walking into the orange zone would give a negative going pulse.

The photo quality is not good enough to determine anything else.