Powering the RPi from the GPIO port - Raspberry Pi Forums

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i'm building turtle, , want set free. requires 2 things - wireless tcp connection turtle controller (another rpi - phase complete barring code), , other step self power. plan use li ion battery. single cell churns out 3.7v, , i've found low drop-out regulator make magic 3.3 power rpi. choice of li ion down having drive stepper motors draw amp each, hence 4ah battery. anyway plot...

have 1 question, if connect gpio pin 1 3.3v regulated supply, according schematics, should "all work"tm since upstream of rpi 3.3v regulator (np1117-3.3) capacitors/ zeners etc protect rpi usb flaws.

have on powered rpi gpio pin 1? (and pin 6 gnd of course!!).

ta,

andy

hove wrote:i have 1 question, if connect gpio pin 1 3.3v regulated supply, according schematics, should "all work"tm since upstream of rpi 3.3v regulator (np1117-3.3) capacitors/ zeners etc protect rpi usb flaws.
looking @ schematic 5v line connected pins on bcm2835 labelled "vddbatt" (pins a13, a14, a15, b13, b14) being used hdmi pull-ups. no idea how critical these operation if you're not using hdmi though.

paul


raspberrypi



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