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*Need Help* building a giant-size Pac-Man Clone
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*Need Help* building a giant-size Pac-Man Clone

by NateMac on Tue Jun 28, 2022 5:50 pm

Seeing one of these at my arcade got my wheels spinning: https://www.youtube.com/watch?v=gWPu-aUY74M

I began my build: https://imgur.com/a/FcX63gj

Using a Pi2 and the Adafruit code I was able to do a proof-of-concept: https://imgur.com/a/a7qwGmV

But this is as far as I got, programing & git-hub is not my strong-suite.
I do have an Electrodragon Matrix panel coming to help split out the panels instead of just one long chain.

I guess my question is, how should I proceed to best run this off a Pi4 as mirror of the display similar to the Pi2 or using an HDMI to USB capture device and mirroring another computer, as done here: https://iot-for-maker.blogspot.com/2021 ... tents.html

Screen Shot 2022-06-28 at 1.51.01 PM.jpg
Screen Shot 2022-06-28 at 1.51.01 PM.jpg (971.88 KiB) Viewed 135 times


If anyone can help with the program side or point me in the direction it would be appreciated.

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Re: *Need Help* building a giant-size Pac-Man Clone

by adafruit_support_mike on Thu Jun 30, 2022 10:01 pm


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Re: *Need Help* building a giant-size Pac-Man Clone

by NateMac on Thu Jun 30, 2022 10:47 pm

Correct and the photos I post show that working on an RPi2, but I’m getting massive flickering…
https://imgur.com/a/a7qwGmV

Also hoping to get this working on a fast pi4 and do the usb hdmi capture shown in that article

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Re: *Need Help* building a giant-size Pac-Man Clone

by adafruit_support_mike on Fri Jul 01, 2022 4:12 pm

Flickering usually traces back to low power or signal timing.

What are you using for power?

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Re: *Need Help* building a giant-size Pac-Man Clone

by NateMac on Fri Jul 01, 2022 6:54 pm

adafruit_support_mike wrote:Flickering usually traces back to low power or signal timing.

What are you using for power?


It’s in the Imgur link, 5v 1000w 120a

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Re: *Need Help* building a giant-size Pac-Man Clone

by adafruit_support_mike on Mon Jul 04, 2022 6:13 pm

The nameplate and images don't tell me much about the PSU's line regulation.

The power wiring shown in the photos is pretty loose. If you have access to an oscilloscope, check the voltage between 5V and GND at the point where they enter each matrix, and between GND at the point where it leaves the PSU and GND where it enters each matrix.

The video shows line-to-line glitching, which probably means the latch/strobe signal is getting corrupted. That can be a problem in the signal line itself, but can also be the result of voltage spikes in the supply. I don't see any horizontal shifting, which means the bits are getting clocked into the matrices properly, and that throws more suspicion on the latch/strobe signal.

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Please be positive and constructive with your questions and comments.