Battery-powered RPi freezes when taking picture - Raspberry Pi Forums

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hello,

i'm working on battery powered rover , i'm in bit of pickle regards camera module. note no expert on means.

here's picture of setup: http://i.imgur.com/fi3etax.jpg (ignore gpio connectors)

summarize:
- rpi connected powered usb hub
- usb hub connects wn-722n wifi adapter
- rpi powered usb hub (5v)
- rpi has on-board camera module

when usb hub powered adapter , wall socket, works fine. wifi works , can take pictures/video camera module.

when power usb hub 5v battery pack instead, wifi first works , can communicate it. however, second run command activates camera module, rpi appears freeze! nothing responds until after restart. i've tried changing 5v battery pack more powerful batteries , voltage regulator no avail. keeps freezing when activate camera board.

thoughts on what's wrong? , pointers how debug issue further? feedback appreciated.

thanks!

well, despite fact you've tried various battery options, thing seem obvious power.

when activated, camera module draw quite lot of current (i believe i've read can as 200ma). presumably causing surge battery units can't cope with.

1 way prove measure voltage on test points , activate camera (when running on batteries) , see if there sudden dip in voltage. ordinary digital voltmeter might not sample fast enough show brief drop, maybe old fashioned analogue 1 coil , needle indicate flicker, or better form of 'scope or logger.


raspberrypi



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