In Car Media Player - Raspberry Pi Forums

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hi.

have model b pi, running raspbmc upis ups board attached , small wifi router plugged in ethernet (powered externally).

project in car media player.

pi , ups board performing expected:
ignition off, wait 20s delay , shutdown pi.
power on pi boots , starts media server (minidlna)

problem lies external hard drive, connected through powered usb hub , dc-dc convertor provide 5v power supply hub.

when switch off ignition power drops pi, usb hub , wifi. (but that's not problem.)

@ point upis powers pi, pi seems power hub, external hard drive , @ least led on dc-dc convertor.

it's poor pi , shuts off immediately, wasn't quite intended.

i'm considering options, think limited.

use sealed lead acid battery connect switched car power , dc-dc convertor, without knowing idle power requirements of hub , hard drive i've no idea if sensible.

if recommend ultra low power external hard disk might option.

if knows how limit usb maximum current supply usb standard (140ma?) might help.

has solved problem themselves, if so, pass on knowledge.

regards,
steve

do want hub pull power pi? if not put diodes on feed lines comming pi hub.

if want hub shut off @ same time pi solution becomes more complex.


raspberrypi



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