Hacking HDMIPi power switch with Feedback #piday #raspberrypi @Raspberry_Pi
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…
…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!
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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