Pi in a Super Famicom Build

obsidianspider

@darthpaul said in Pi in a Super Famicom Build:

@obsidianspider I would replace plastic circle on the top with clear acrylic and have the screen displayed through it.

Go for it!

darthpaul

You should create a how-to thread just on a secondary screen. I'm sure there are many "MAME" users who could find many ways to use that second screen on a full size Arcade cabinet.

obsidianspider

@darthpaul said in Pi in a Super Famicom Build:

You should create a how-to thread just on a secondary screen. I'm sure there are many "MAME" users who could find many ways to use that second screen on a full size Arcade cabinet.

I'm still working out the kinks, and my code is a hot mess because I don't know what I'm doing, but everything I'm doing with that screen is based on the examples from Adafruit.

edmaul69

@obsidianspider it should be done in the disc drive on a gamecube. Hinged so when you open the drive the screen sits vertical.

darthpaul

@edmaul69 I like it, the hinge would have to be modified so the lid opens wider but I'm always up for a challenge.

obsidianspider

Reddit really likes a Super Famicom clock that someone made. Looks like I'll be in good company once I get back from traveling for work and can get my build "done." (Are they ever really done?)

obsidianspider

Before I hack up the cartridge for my screen I decided to do a test cut on a light switch plate. To keep things simple I'm making it 36mm high and 46mm wide.

I made a rough cut with my Dremel inside the line.

I used a hand file to clean up the edge and get it to the right size.

I set it on the screen and it looks pretty good. Not perfect, but pretty good for a first try.

Now to try it for real…

obsidianspider

My friend is still working on the 3D printed back panel, so I decided to work on the screen in the cartridge after work today and I am really happy with how it turned out.

I started by taking the label off the cartridge. I tried putting it in boiling water, but that didn't work well and I didn't want to warp the plastic, so I soaked the label with WD-40 and then used my fingernail to scrape it off. I printed out a label to use as a mock-up so I could get placement for the screen hole.

After some careful time with a Dremel and file I got a pretty decent hole.

I decided to cut down some standoffs and glue them to the cartridge so the screen would be removable. You can also see the one screw tab that came cracked off while I was filing (I guess the tweaking in the vise must have caused stress on the 20-year old plastic) and I had to slather it with hot glue to give it strength when I put it back in.

Having the screen removable proved a good idea as my quick disconnects that I planned to use didn't fit when I tried to close things up so I had to remove them and solder the ribbon cable directly to the screen from the cartridge board.

It fit together pretty nicely

And it works really well! Now I need to design a label.

moosepr

@obsidianspider looking slick man! You must have spent ages getting that hole just right. It looks perfect in the picture

obsidianspider

@moosepr said in Pi in a Super Famicom Build:

@obsidianspider looking slick man! You must have spent ages getting that hole just right. It looks perfect in the picture

Thanks! It really did take hours. From the time I started the test cut on the light switch to the actual photos I posted here it was about 7 hours. The hole isn't perfect, but I think it's pretty good for being the second time I've done anything like that (the first time being that light switch mockup), and being freehand.

I used a piece of craft foam to smoosh between the screen and cartridge to take up the gap so the backlight doesn't bleed through since the Super Famicom cartridges aren't flat.

To anyone else who is going to attempt this, what worked well for me was to cut an undersized hole with your Dremel (~1mm inside the line) and then finish it off with a razor blade to get the melted plastic off, and hand file to get it to the right size, make it straight, and smooth it out.

obsidianspider

I'm finally back from a two-week business trip and I was fortunate enough to be near a Micro Center this past weekend where I picked up a Pi 3 and an Adafruit 15mmx15mmx15mm heatsink. Since I'm past the "I might fry something while figuring out these GPIO pins" phase I figured it was time to update to a Pi 3 from the Pi 2 that I had been using during the main part of construction. I know there hasn't been a consensus on how much a heatsink will help but for $2 I figured it would probably help some and would give some peace of mind. The 15mm tall heatsink from Adafruit is bigger than the ones that come with most kits, is not much taller than the Pi itself and aside from my thermal paste oozing out a bit, looks pretty good.

Now I'm installing a fresh RetroPie Image on a 32GB micro SD card, and doing the Raphnet kernel patch to address the "northwest" issue.

backstander

@obsidianspider that's a tall heat sink but looks nice! I personally feel better about having heat sinks on both my CPU and GPU on my Raspberry Pi 3 and after extended play, I can feel the heat coming off my heat sinks. I've heard that the RPi3 gets hotter than the RPi2. I've never owned a RPi2 but a few times I've had to turn on a small USB fan to cool my RPi3 after extended MAME, PSX and compiling MAME2010 from source because I was getting the yellow/red box on the top right of the screen. I think one of those days it was like 100+ degrees fahrenheit (37+ celsius) outside. One thing I love about PC gaming is in the winter time you can keep warm next to your PC lol. A trick you can try in the winter is to turn your PC case around so the fans are blowing on you and you'll stay nice and toasty :-)

obsidianspider

@backstander said in Pi in a Super Famicom Build:

@obsidianspider that's a tall heat sink but looks nice! I personally feel better about having heat sinks on both my CPU and GPU on my Raspberry Pi 3

I thought the CPU and GPU were in the same SOC? Where do you have a second heatsink? I thought the other "big" chip on the top was the USB Ethernet controller?

backstander

@obsidianspider You're probably right. It's the 2nd largest chip on the board. For some reason I was thinking it was the GPU.

Update
This is what mine kind of looks like:
https://cdn.hackaday.io/images/1331831458963049177.jpg

Another Update
This says that 2nd chip is the LAN controller but it is from an other model:
http://elinux.org/images/thumb/c/cf/Raspi-Model-AB-Mono-2-699x1024.png/400px-Raspi-Model-AB-Mono-2-699x1024.png

obsidianspider

I was getting some lightning bolts in the top right of the screen while doing large wifi file transfers on my new Pi 3, so I figured that meant the 2A power supply I'd been using from my Pi 2 wasn't keeping up. I found a 3.5A one on Amazon with mostly good reviews (not affiliate link). A few people said they had overheating issues, but with over 1500 people saying good things I figured it was worth trying. It came today and seems to work well. It's pretty large, and the blue LED is VERY bright, so I put a piece of electrical tape over that. I tried copying over a few GB of data and the lightning bolt came on for a brief moment when the file transfer started, but then the lightning bolt went away and stayed away. Hopefully this will resolve my power issues.

backstander

@obsidianspider so you're getting the lightning bolt on the Pi 3 with the 3.5A power cable? That's very odd...I'm using a 2.5A power cable and haven't had this issue. Then again I only use WiFi when I'm traveling because I'm hardwired Ethernet when I'm at my house.

obsidianspider

@backstander Yeah, and it's still doing it when I try overclocking, which I somewhat expected. I do have an intermediate cable and it's going through a Mausberry, so maybe it's something to do with that? I removed the overclock and now it only shows up when I initiate a big file transfer, then it goes away after a second. Oh well, now I have another power supply.

obsidianspider

After quite a bit of reading on this after being disappointed that my snazzy new power supply didn't fix the issue, I'm wondering if the 2m long power cable is to blame.

That said, I found in another post that you can set avoid_warnings=1 in config.txt to disable the lightning bolt. I did another huge file transfer and no lightning bolt. That said, of course, it doesn't actually fix the issue, but I don't really do a lot of huge file transfers often and things seem otherwise stable. The red LED did blink a few times during the file transfer, so the undervoltage situation is occurring, but with all the stuff I have plugged into this thing, it really could be anything.

Interesting though that my Pi 2 didn't have this situation at all, even with a separate dongle for USB Wifi.

Oh well, back to sorting out my scripts for my TFT screen.

moosepr

@obsidianspider maybe it's not the amps that is the issue, but more the voltage? Some power supplies are a bit lax on the actual voltage, and can sag for a second when the power requirements ramp up. With things like charging a tablet the power requirements are fairly constant so most power supplies don't need to cope with varying demands.

I personally don't have a PSU of choice, but maybe someone else can recommend a good one on here?

obsidianspider

@moosepr Good point on the varying loads. When the file transfer starts the bolt would come up for a half second at the very beginning, then go away and stay away, even if I was making a transfer that lasted 10 minutes. I don't want to get into the power supply business and since I already spent $15 on this one, I'll run it and see how things go. The 2m length may be a part of the issue, and it may be the intermediate cable for inside the Super Famicom, or the Mausberry, or something that I have connected to the Pi. It's really difficult to say. I'm running things bare bones at the moment and I don't see any wiring issues.

One thing I will say though is that I'm not really having any overheating issues based on the monitoring that I've been doing with my TFT

(I know it's a bit ugly right now, but I'm still sorting out what info I want to display and will adjust formatting later)

For the games I've been playing I didn't need any overclocking. With lightning bolts showing up and no visible performance gain when overclocking I backed it down to the stock clock speeds and I've been fine with the heatsink. My friend is still working on the power plate so I haven't been able to put the Pi in the Super Famicom case to see how that affects temperatures, but I'm optimistic.