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kevinstonehouse
(@kevinstonehouse)
Eminent Member
USB Splitter

Anyone try using a UBS splitter to power an external LED light while a UBS-Drive is attached? Just curious if the UBS-port is robust enough to manage this as thus far my attempts have been failing.

Posted : 13/11/2022 12:49 pm
kevinstonehouse
(@kevinstonehouse)
Eminent Member
Topic starter answered:
RE:

Forgot to mentions that when I tried to use a splitter with the Mini the LED lamp works fine but the USB drive is unreadable. Once I moved the same setup to my PC everything works just fine. Here is the splitter I used: https://www.amazon.de/-/en/gp/product/B07PH2WXKT/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

This post was modified 3 months ago by kevinstonehouse
Posted : 13/11/2022 2:07 pm
mark
 mark
(@mark-3)
Reputable Member
RE:
Posted by: @kevinstonehouse

Forgot to mentions that when I tried to use a splitter with the Mini the LED lamp works fine but the USB drive is unreadable. Once I moved the same setup to my PC everything works just fine. Here is the splitter I used: https://www.amazon.de/-/en/gp/product/B07PH2WXKT/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

What you are calling a splitter is actually a USB hub. It has a USB hub chip inside. If the Prusa firmware has no driver for that chip, and there is no expectation they would add drivers for USB hubs, it won't work. You can't just split USB like you can with power outlets or coax cable. Your PC has lots more memory for software and has drivers for every hub chip they might expect to see, and if they don't have a driver, they can download it. I would not expect Prusa to provide the USB port with enough power to run more than one device. On a PC that is expected.

Regards,

Mark

This post was modified 3 months ago by mark
Posted : 13/11/2022 3:49 pm
kevinstonehouse
(@kevinstonehouse)
Eminent Member
Topic starter answered:
RE: USB Splitter

Yeah I figured that it would either be a software issue or output current. Been looking around for months without much luck finding a simple Y-splitter.

Posted : 13/11/2022 4:17 pm
d0ug
 d0ug
(@d0ug)
Trusted Member
RE: USB Splitter

USB can't be passively split. You need a hub. Any kind of passive USB splitter will probably work one of two ways. Only splitting the power wires and leaving the data completely disconnected, or one side of the split will have the USB data and power and the other side of the split will only have power. A power only splitter would be good for something like charging two phones off one charger. However since none of the data lines are connected they would only charge at the slow standard 5v rate. A USB splitter with data and power on one split and just power on the other split could potentially be dangerous. If a QC compatible phone were plugged into the data and power side and it commanded the charger to go into QC mode and output a higher voltage like 9v or 12v. Then if another phone is on the power only side and doesn't expect or support the 9v or 12v of QC mode it may be fried.

Posted : 28/11/2022 1:49 am
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