RPI with 9'' screen and one power supply - Raspberry Pi Forums

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hello everybody,

working on home projet using rpi, smart screen. that, bought aliexpress 9'' screen (http://www.aliexpress.com/snapshot/6427 ... 8027982857).

screen require own power supply (12v).

project, want on power supply. on controller board of screen, noticed pins 12v output. thought convert 12v 5v , plug in correct gpio in rpi. convert voltage, used precision voltage component (http://www.analog.com/media/en/technica ... /ad584.pdf).

problem when check multimeter voltage, keeps changing (5v, 0 4 etc ..) therefore rpi cannot boot.
idea? how can "share" 1 power supply emit 5v rpi , 12 screen. brand new in world, if can point me direction great.

in advance
julien

the component trying use not suitable. voltage reference chip , can supply 10ma. rpi needs 1000ma - 2000ma.
5v switching or 'buck' regulator chip or ubec.


raspberrypi



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