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91 points jackedEngineer | 1 comments | 12 Apr 25 18:45 UTC | HN request time: 0.001s | source

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zerof1l ◴[15 Apr 25 11:22 UTC] No.43691292[source]▶

I also have such a lamp. Supposedly it's USB-C connection, but it only works when connecting with USB-A to USB-C cable.

My guess is it's due to the requirement to comply with EU law about USB-C. But proper USB-C requires active circuitry but manufacturers don't add it to save a few cents.

replies(3): >>43691344 #>>43691442 #>>43692461 #

1. mystified5016 ◴[15 Apr 25 13:32 UTC] No.43692461[source]▶

>>43691292 #

Proper USB-C charging requires no active circuitry. You need a pull-down resistor on both CC lines. Not just one, or your thing only charges if the USB C cable is rotated the right way up.

As mentioned, the requisite resistors are less than one cent each in quantity.

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Kmart lied to me, so I hacked their lamp [video]