Cheap PIR movement sensor and switch - with schematic

A very cheap, mass produced movement sensor that is intended for switching lighting on when people are present. It seems to have a fixed 20 second delay, that is re-triggered by continuing movement. I'd guess the main use would be as a corridor lighting controller.
It's only suitable for low lighting loads. Modules like this are often built into ceiling bulkhead lights.

The voltage range is universal, but at the cost of extra heat dissipation and reduced lifespan on a 200V and higher supply.

The circuitry is very typical for a unit like this, with the unusual twist of using a thyristor to shunt a bridge rectifier as an alternative to using a triac or relay. The advantage being the ease of driving and the guaranteed waveform switching symmetry. The downsides of that approach are the higher voltage drop across the thyristor and rectifier. But in a low current application like this it's not an issue.

Jurriaan has possibly identified the chip as a HS6601MX which does seem pin compatible.

The pinout of the PIR control chip is:-
1 Light sensor sensitivity (voltage divider)
2 +V
3 PIR signal
4 GND / 0V
5 Output switching device
6 Not used
7 Time (voltage divider)
8 Sensitivity (voltage divider)

Here's a link to the listing where I bought these (not a sponsor):-
https://vi.aliexpress.com/item/1005005445848489.html



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