I recently picked up a new pixy2 to play with.
when I hook it up to a PI3 via usb it complains about over current and
the pixy2 device is freaking out. The spec sheet says only a few hundred mA
nothing near the usb limit. which on the pi3 with nothing else plugged in is 1.2A
When I plug the thing into my normal desktop machine I get things working ok
[4077153.731001] usb 3-12: new high-speed USB device number 87 using xhci_hcd
[4077153.859621] usb 3-12: New USB device found, idVendor=b1ac, idProduct=f000
[4077153.859626] usb 3-12: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[4077153.859629] usb 3-12: Product: Pixy
[4077153.859632] usb 3-12: Manufacturer: Charmed Labs
[4077153.859635] usb 3-12: SerialNumber: DEMO 0.0
and the device resets and centers itself nicely.