Power by USB HUB oddity - Raspberry Pi Forums

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so building portable pi, , hopes avoid having have usb micro involved, read powering pi purely usb connections. after doing handy work on model b shrink down size, connected pi simple (though chinese cheapo) 7 port hub works fine if doesn't power pi itself. if supply power via normal meathod or via gpio, pi accepts hub , on no issues. moment let hub's 5v rail, connected 1a source @ moment (a psp charger testing purposes), pi seems pretend hub doesn't exist. on non-modified pi, getting these results , after testing hub had lying around, i've noticed yet again same issue.

wondering if has had similar issue , maybe solution oddity. added usb ports (for flash drives, wifi, bluetooth, etc), keep wiring minimum if possible.

edit: more specific, pi boots fine. doesn't want act hub plugged in. pi getting power though.

perhaps won't - sorry if case. before ensemble crashed, tried similar thing new raspi cupid setup using 7-port anker usb3 hub. booted not recognise keyboard or mouse connected via hub, though did afterwards when disconnected hub, , used straight usb wireless dongle. did not manage find why, pi subsequently failed boot, under arrangement, , still waiting cupid replacement arrive usa - tried , failed find uk agent. anker hub works fine on pc now. cupid contained in good-looking plastic box contains hides pi proper beneath it, has own input , output socketry , don't yet know if usb socket goes straight pi's own or interfaced via other electronics in cupid bit. hunting!


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