PiGRRL help
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I have been researching some stuff to make a better version of the adafruit pigrrl 2 but I need to confirm some stuff and this is : is it possible to get a 3.5 inch tft working with dual psp analog sticks? Can you add a second pair of triggers? Can you get a volume slider to work? And are all the things above able to work simultaneously?
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@sammyboy Theoretically, you can do just about anything. For a definitive response, you would have to find someone who has already done all of what you propose in a PiGRRL build. I think you need to look at each modification and see if your solution will work and how it affects other components. I think it will get pretty cramped inside the case, but maybe you are planning to expand it.
I think you are going to have to explore your options/solutions for each one of these. I would look at your display first and find out how it differs from the default PiGRRL recommendation. With the display figured out, then look at controls. I think the PiGRRL uses GPIO pins for digital input. Basically, stick and buttons are wired directly to GPIO with a driver to emulate the inputs as keypresses or gamepad inputs. To use analog sticks you are probably going to need a USB controller(s). That will probably be the hardest part, and it might make sense to try to hack in an existing controller board at that point. You could also use its buttons instead of GPIO for everything else.
For audio, if you can find an amplifier with a slider for volume that is small enough to mount, you can probably solve that one.
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@caver01 Do you think I will be able to wire 14 buttons, 2 analogs sticks and the wires for composite video into one protoboard (perma-proto board from Adafruit). Do you think a Teensy board or an MCP3004 is better for dual analog sticks? Thank you.
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@sammyboy I wish I had an answer. I saw your other post about a DIY 14 way. Not sure everyone knows that terminology, but it is a fascinating idea. I know a lot of people in the mechanical keyboard world who use a teensy and open source software to build mech keyboards, but that does not solve for your analog needs. I am surprised someone hasn't tried to do this before. If you could pull it off in a small enough form-factor you could have a sellable project kit.
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