2017-11-18, 11:16 AM
(2017-11-13, 12:38 PM)seaspray Wrote: Right - I'm still on the USB hub issue.
It seems that powered USB hubs are definitely not the Pi 3 best friend....
I bought a TP Link unit (see previous post) and it works OK. However it's a 12v power supply and all my other devices are 5V - I'd like to keep it that way. Additionally, the form factor is quite large...
So, I've been doing a _lot_ of investigation. I finally got the unit that I originally purchased apart and it's controlled by a pair of HS8836 Ic's. I've been unable to track down a definitive datasheet for this chip but there some evidence ( https://detail.1688.com/offer/520006552865.html - second image ) that this is an alternate name for FE1.1S
More research has led me to believe that the issue revolves around hubs back-powering the PI. I do see -71 errors which are usually related to power supply issues....
I've purchased one of these - https://thepihut.com/products/7-port-usb...spberry-pi - which are specifically designed to solve this issue. When it arrives and I've tested it, I'll let you know how I get on.
The hub from thepihut.com works fine. I had managed to get one of the non-working hubs to talk to my pi by cutting the power track on the board internally. Getting the unit apart was not pretty - so only for my desk research... The pihut.com one is cheap enough and seems to work perfectly.