Ask Electronics

3173 readers

2 users here now

For questions about component-level electronic circuits, tools and equipment.

Rules

1: Be nice.

2: Be on-topic (eg: Electronic, not electrical).

3: No commercial stuff, buying, selling or valuations.

4: Be safe.

founded 2 years ago

MODERATORS

[email protected]

What’s the easiest way to pull ~30mA from a USB 3 port without getting a warning from Windows? (self.askelectronics)

submitted 2 months ago by ch00f to c/[email protected]

11 comments fedilink hide all child comments

Back in my day, you could usually sip a few mA from a USB2 port without any trouble.

When I try that now, Windows pops up with a “device not recognized” error. I know you can draw up to 150mA before enumeration, but it looks like after some time, Windows will complain that you haven’t enumerated yet.

Is there an easy way to keep from getting this error without having to actually make the device smart?

I’m hoping for something dumb along the lines of USB-PD but facing the other direction. For the record, it has to work on a USB-A port, so USB-C hacks won’t work.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 2 points 2 months ago

Mobo not have internal USB headers?