Rpi3 alimentato 5v problema USB - Raspberry Pi Forums

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ciao tutti
ho un rpi3 alimentato da un alimentatore 5v 10a connesso direttamente ai gpio 5v e ground
il mio scopo finale e' connettere un arduino nano cui e' collegato un lcd 128x64 spi
purtroppo quando collego l'arduino tramite usb, pixel del monitor rimangono molto fiochi(e in parte accesi in modo errato) mentre la retroilluminazione e' ok.
se invece alimento il raspberry via microusb(o miniusb non ricordo cmq l'alimentazione tradizionale x intenderci) e l'arduino collegato via usb, l'lcd funziona bene.
ho provato anche con un rpi b e mi da lo stesso problema.

ciao, perché alimenti il rpi in questo modo?
gli stai dando corrente "nel verso errato", devi alimentarlo via microusb (standard) e se ti serve più corrente 5v per moduli che hai collegato, semplicemente unisci il gnd dell'alimentatore con quello del rpi e porti il 5v dell'alimentatore ovunque ti serva ma mai direttamente al rpi (ricordandoti inoltre che gli ingressi sono 3,3v e non 5v)..


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