Maxsak
Posts: 1
Joined: Wed Sep 25, 2019 8:07 pm

Using GPIO Pins that are blocked from a touch screen

Wed Sep 25, 2019 8:27 pm

Dear community,

I am not really experienced in using my raspberry pi, but willing to change that I decided to try a little DIY-project.
I'd like to controll a few WS2812B LED's with my raspberry pi 3, while still using the touch-function of the 5 inch screen I bought. Luckily the screen doesn't use all GPIOs, but it covers all 5V outputs of my rpi, wich would make it possible to controll the strip, when using an external power supply for the LEDs. But since I only need to power around 6 LEDs, I don't want to use that extra supply.
Now to my question. Would it be possible to "double use" one of the 5V outputs of the raspberry that the screen uses to power the LEDs?
Or could that harm my raspberry or the screen?

Thanks

User avatar
rpdom
Posts: 15580
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: Using GPIO Pins that are blocked from a touch screen

Thu Sep 26, 2019 6:52 am

Maxsak wrote:
Wed Sep 25, 2019 8:27 pm
Would it be possible to "double use" one of the 5V outputs of the raspberry that the screen uses to power the LEDs?
Yes. With a good power supply there should easily be enough power for the screen and that small LED strip.

alphanumeric
Posts: 2164
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Using GPIO Pins that are blocked from a touch screen

Thu Sep 26, 2019 11:57 am

I do it quit often. I usually mount a Proto Hat on a stacking header between my Pi and my Hat. Then feed what ever signals I need to my breakout boards from the Proto hat.
https://www.adafruit.com/product/2310
https://www.adafruit.com/product/1979
https://www.adafruit.com/product/2337

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