I can't understand this circuit board

Shauryafrom2006 · Feb 18, 2024

Photo of a white printed circuit board with surface-mount LEDs, a dome-shaped PIR motion sensor, a micro-USB port, and printed labels including YX-4791 and R1 to R14.

Photo of a white LED circuit board labelled YX-479T, with several yellow-white surface-mount LEDs, a domed white PIR motion sensor lens, a micro-USB connector at the lower left, and small SMD resistors and transistors.

Photo of a square white LED circuit board with a micro-USB connector at the top left, several surface-mount LEDs around a central round lens, and the printed label YX-479T and 9490.

Photo of a small square printed circuit board on a black background, with a flat silver metal-covered component mounted at its centre and a faint spiral copper trace visible on the board.

phinds · Feb 18, 2024

Since you have posted no circuit diagram, just a pic of some components, no one here is going to be able to figure it out either. It's a bunch of components, not a circuit, as far as we can see.

Rive · Feb 18, 2024

Some kind of cheap battery management and some kind of (likely cheap) LED control.
Can't even see the chip markings.
What's written on U1?

Baluncore · Feb 19, 2024

Welcome to PF.

Shauryafrom2006 said:

I am unable to understand this circuit, help would be appreciated.

What does it do, is it a motion sensing light, or a fire alarm ?
Why does it have a USB connector ?

The PR 9490 component in the middle of the PCB looks like an infrared detector.
Does it have a multi-facetted lens in the outer case that is not shown ?

Averagesupernova · Feb 19, 2024

https://www.google.com/search?q=yx-...rgBA8gBAPgBAYgGAQ&sclient=mobile-gws-wiz-serp

I can't understand this circuit board

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