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I thought it would be worth taking a look at some more recent versions of these. I've had some older ones on test for a while, and they do provide surprisingly useful light on demand in the event of power outages.
For a while I had an issue with a failing appliance heater that would randomly trip the main RCD for the whole house (TT system) and these gave very reassuring light when the place was suddenly plunged into darkness.
The lithium cell in the small unit has now been tested, and is a miserable 150mAh. The lithium cell from the device I showed does fit, but only barely, and with no room for an adhesive pad to stick it in. Other similar vapour devices may have slimmer lithium cells in them that are easier to fit in.
As always, take extreme care when fitting lithium cells, due to their high energy release capabilities. If adding more cells in parallel, make sure their voltages are very close first to minimise current flow as they balance.
The electrical tests at 4.2V (fully charged lithium cell) showed that the small unit uses between 7-70mA depending on the intensity setting, and will stay lit for twenty seconds after the last movement is detected.
The standby quiescent current is a very good 22uA.
I like this style of light a lot. They don't need recharged too often - especially when you boost the capacity a bit, and are perfect little lights for power outages or just late night prowling around the house.
Keywords to find this type of light on eBay are:-
USB rechargeable PIR light
Typical cost should be around ยฃ$โ‚ฌ5 for the small one.
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17 thoughts on “Usb rechargeable pir light teardown with schematic”
  1. Avataaar/Circle Created with python_avatars keith king says:

    Just as I'm make a few of these right now. Great timing Clive ๐Ÿ‘๐Ÿ‡ฎ๐Ÿ‡ช๐Ÿ’š๐Ÿ™๐Ÿผ

  2. Avataaar/Circle Created with python_avatars Mizai Slots says:

    i always thought you said microfart untill i searched it up

  3. Avataaar/Circle Created with python_avatars Vaughan Ellis says:

    I have a similar PIR light that runs on 4 AAA batteries (currently powerowl 1000 mAh), that only needs charged 1 or 2 a year, there is no on/off switch, just a sliding battery end cover.

  4. Avataaar/Circle Created with python_avatars big marc says:

    Fek me, I got the big one yesterday!

  5. Avataaar/Circle Created with python_avatars Curtis Hoffmann says:

    Hey, a new way to play strip poker!

  6. Avataaar/Circle Created with python_avatars John DoDo Doe says:

    In my country that changed to metric around 1900, measuring tools still had our national inch unit until around year 2000. Makes sense that Britain would do the same until year 2100, given the late change in daily use.

  7. Avataaar/Circle Created with python_avatars Michel777 says:

    If 200mm is 12inches, i'm way above average

  8. Avataaar/Circle Created with python_avatars Qscreator says:

    i like you show how to work of PIR in this circuit ?

  9. Avataaar/Circle Created with python_avatars First Name Last Name says:

    I have something similar to this except it doesn't stay charged at all. I charge it up and the next time I go to use it it's dead.

  10. Avataaar/Circle Created with python_avatars Dave Fredrock says:

    Thanks Big Clive. I was thinking what a bummer it was that they could go unstable but then also being an indication that a charge was needed is convenient. With greater capacity that might be a benefit in less frequent charges though getting the cells down to 3.v would be cool. I've seen similar lights really plugged recently on Ali.

  11. Avataaar/Circle Created with python_avatars lawson143 says:

    It's an outrage

  12. Avataaar/Circle Created with python_avatars SeanBZA says:

    That WTF capacitor position is for a resistor, as they likely had a cost cut version that removes the 1c regulator and runs the little micro and PIR off the filtered battery voltage. Both will work, just PIR sensitivity will change with battery voltage.

  13. Avataaar/Circle Created with python_avatars Cody-JRT says:

    We use the same measure tape in the USA too. We use both systems in my house interchangeably.

  14. Avataaar/Circle Created with python_avatars toxicpsion says:

    could the WTF cap instead be a link to run batteryless with a power supply ?

  15. Avataaar/Circle Created with python_avatars Robin Cross says:

    For years if not decades in the USA, I remember metric on one edge of tape measures. And of course feet inches and other helpful lengths indicated on the other edge.

  16. Avataaar/Circle Created with python_avatars meet v says:

    One of the cleanest design.

  17. Avataaar/Circle Created with python_avatars Zygfryd Homonto says:

    thanks you you @bigclivedotcom I collected from my friends and family already 100+ of these LiPo batteries. Only 1 of them is not really keeping the charge – all others are 100% OK – thanks again!

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