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January 30, 2015 AT 2:00 pm

Hacking HDMIPi power switch with Feedback #piday #raspberrypi @Raspberry_Pi

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Raspi.tv posted a follow up to their how to hack the HDMIPi Power Switch tutorial- check it out here.

In a recent post, I showed you how to hack the HDMIPi power switch so that you can turn the screen on and off from the Pi.

But no sooner had I done that than my friend Peter Onion, wondering if there was a way to detect if the LCD is on or off in case it gets “out of sync”, tweeted this…

Hacking HDMIPi Power Switch with Feedback RasPi TV

…and that was all I needed. Well. That and a multimeter. I started carefully probing the various 3-legged semi-conductors on the HDMIPi board. I thought it would take a long time to find what I was looking for, but it only took about 10 minutes. I found a transistor where one leg reads 0V when the HDMIPi LCD is on and 3V3 when it’s off. Perfect!

Check out the full tutorial here.


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