Fixing a faulty Temu light (Patreon)

Fixing a Temu light - with schematic

To be fair, this fault was very odd and would have slipped through basic testing. It only shows up when you attempt to charge the unit, and even then it still lights its "charging" indicator. My best guess for the switched supply to the PIR sensor is for lower standby current when the processor shuts down on low cell voltage at about 3.2V This unit uses much simpler circuitry than a previous version which used a dedicated chip with control over timing and sensitivity. Those variables are set in the software in this unit, but there's still scope to tweak the light sensor level by substituting the 1 Megohm resistor for a higher or lower value. Standby current is OK at around 45uA, given that the unit always has an active movement detector. The lithium cell supplied is a bit minimal, but it's easy to swap in a new cell under the PCB. For year-on-a-charge use you could even add an external cell. These lights are great for off-grid or power-cut prone locations. They provide a very convenient splash of light on demand at night, and with normal triggering will last a long time between recharges. They also lend themselves well to solar charging with a basic 5V panel. The magnetic pad allows the light to be moved around as needed. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators