Interesting. I read about your problems with those few left over Pins. Really fast work here. But, are there no downsides, like less buttons pressed at the same time or something like that? What are the downsides, if there are any, in contrast to the teensy method? For now, I see no downside. The p...

Hello guys! This is a button PCB for Gameboy Zero using charliplexing, a method that allows you to control several buttons via few I/O ports. http://i.imgur.com/KqYWdhh.png Wait, but why will I need this? This board is design for people that wants to use DPI to drive their LCD and use PWM pin for au...

@Spruc3Moose

I've made a simplified diagram for people that want to make one by themselves:


I'm not planning to make a tutorial anymore because I think this diagram really explained what you have to do..

It does! I'd like to add my screen and the joystick buttons to the diagram before calling it "final" though. Okay, so I first tried it with your diagram and I received really bad feedback when I plug in my headphone jack. The speaker had a lot of static whenever I plug in the headphones. I then swi...

Helder wrote:What improvements did you make in the schematic? The one you made looks exactly like the one above. Maybe you forgot to edit it with the diodes? If I'm reading this right each button will get a diode so 12 in total instead of the 4 currently in the schematic.

ops wrong image will fix it now

Hello guys! :) I've decided to use DPI to drive the screen and use 2 PWM pins to output audio, these take up almost all of the GPIO pins and left with only 4 for me to use. I've to figure out a way to control 12 buttons in total with only 4 GPIO pins, otherwise, I've to use teensy and sacrifice an U...

LoafSlice wrote:this doesnt work?

Yes sorry I accidently set the link to temporary, not its fixed!

Hello guys! I've made a discord channel for people to chat in real time.
https://discord.gg/013EPrt1lc6ifvZou
hope this can help people out with small question that doesn't worth to open a whole new post

After checking their wiring, I found out that they didn't connect any button to ground, which means the input pin will take 3.3v directly. I'm not sure but can gpio pins take up to 3.3v? I thought it will just kill it. 3.3v won't kill it, the Pi IO is 3.3v logic so it's perfect.. however the schema...

Take a look at this project https://hackaday.io/project/10207-gamegirl-the-retro-console-done-right which has 12x buttons on 4x GPIOs without the need for any ICs.. You may have to join the Discord chat and ask for the code that makes it possible, as I can't see it shared on the project page.. Anot...