I'm looking for 3.5" display for raspberry pi 4 that can have free GPIO pin that are available to use, Some displays use <40 GPIO pins but the free GPIOs are not avaliable, If you know such display please comment,
Or, should you wish to use multiple, "non-clashing" HAT's or other things, there's the PHAT STACK which, FWIW, I've used here: http://www.cpmspectrepi.uk/raspberry_pi ... Stack.htmlalphanumeric wrote: ↑Thu Oct 03, 2019 7:35 pmIf you mount a Proto Hat https://www.adafruit.com/product/2310
with a stacking header https://www.adafruit.com/product/1979
Between your Pi and display you can access any unused GPIO pins.
You'll also need these standoffs https://www.adafruit.com/product/2337
In all my web-wanderings I have not seen any large LCD boards for a Pi which do not have the screen blocking use of at least 26 GPIO pins. It might be possible to fit one of those and access the others using a ribbon cable but there would be no 5V or 3V3 rails available on that.