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A project log for Portable Raspberry Pi gaming handheld

Made from a Raspberry Pi 2 B, a 4,3" TFT screen, a powerbank and a modified SNES controller.

LumorLumor 07/28/2015 at 19:432 Comments

It's been a while, but i can finally continue this project and hopefully finish it.
I will be posting updates regularly the coming days/weeks.

VIDEO :

At the time of my last update, i didn't get any video on my TFT screen. Today i recieved a new AV cable and the screen worked fine! I'm a bit confused because in the past i have tried different cables while troubleshooting and it didn't work, leaving me to think the screen was broken since it used to work fine with the cable i had.

Not knowing the cable would be the solution, i also ordered a PiTFT (a HAT screen for the Pi) so i have to choose which screen i want to use :

Option 1 : The PiTFT has higher resolution (480x320) but uses some of my GPIO pins, i'm also not gonna be using the touch feature and i'm not sure if that's gonna eat more battery power (i think not). Also, using the PiTFT stops me from using the exact same linux image as my Arcade cabinet because the GPIO pinout would be different.

(I will not be using the PiBorg you see in this picture.)

Option 2 : My other TFT screen uses composite video so i don't lose any GPIO pins but the resolution (320x240) is a tad lower and it requires 12v to operate which in turn requires a step up converter. The resolution is too low, text is hard to read / fuzzy and the image quailty is not optimal either.


AUDIO :

I still need to build a small amplifier, i will be doing that this week i hope.
I have already started designing the PCB, as soon as i get more photosensitive PCB's i will start etching and testing the amplifier. If it all works i will post full details about it.


POWER :

I stepped away from the plan to use Lipo / Li Ion batteries, it's too complicated and too dangerous in my opinion so i decided to go back to plan A and use a power bank.
I have bought two powerbanks to see which one works best for my setup, i will be testing them to see if these powerbanks can... :

or other unpredictable powerbank behaviour.

I bought the Anker Astro E5 16000mAh and the Trust Urban Revolt 8800mAh. I will post updates on which one i will be using and why after i have tested them.

Discussions

j0z0r pwn4tr0n wrote 07/30/2015 at 03:00 point

I know what you mean about the video cable. The Pi uses a different one than the standard. And it's not just the jacks being switched, the ground is abnormal too. So you gotta switch all the wires if you want to use one of the standard cables. Did you get one that works without any modifications? If so, then where? 

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Lumor wrote 07/30/2015 at 12:08 point

I bought one at a dutch webshop (www.kiwi-electronics.nl) that sells allot of Rpi/arduino products, they ship worldwide though. The cable works if you use the 'audio right' instead of the 'video' connector. Luckily they warned about this on their website.

I think my other cable has more switched than just the 'video' and 'audio right' because it did not work at all.

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