Rasp Pi No HDMI - Portable MAME Part 2 -- Episode 328

Hi Team,

Love your work, you always inspire me to build smaller and better things

Can I ask two things please? What are the SMD resistors for that are listed in the BOM and what type of diodes did you use on the button matrix (that aren't in the BOM).

Thanks you for your great channel.

Mick

I did not create the fritzing diagram.

Thank you! I like the detailed picture as well so thank you for that too. I'm just trying to see how to incorporate a screen such as the one used in the no HDMI build and get sound also. Controls can be hijacked from USB so I'm not too worried in that area. I won't be starting this personal project until after April anyways due to work so I have plenty of time to keep reading, researching, and planning before I jump into this (while also working on my MAME cabinet).

It is truly a work of art. Thanks for sharing another amazing portable console.

Hi Joe,

It is possible to get an audio output from the Pi Zero with an I2S Class D Amp and speaker.

I have had success with this breakout from Adafruit

https://www.adafruit.com/product/3006

It was used in this project.

Stormtrooper Pi Radio

The audio quality is quite nice for the price.

Trent

I appreciate your reply; thank you!

I know that the A+ does shine better than the Zero with that audio output but I have seen projects where GPIO pins 18 and 19 (ALT 5) ((https://learn.adafruit.com/introducing-the-raspberry-pi-zero/audio-outputs))are used to redirect audio. Using the information from RPi's site Mode 3 would allow me to use pins 18 and 19 (ALT 5) but that's where I get confused and the only remedy is a nice tall glass of beer with a slice of pizza. It is definitely something I would need to sit down and research but it makes this more fun.

EDIT: In part 1, Felix is using a Pi Zero to do the configurations with the teensy. Did you make any alternate changes to all this? If that is the same screen then you proved it does indeed work.

thanks benheck thats really helpfull

..now I know where my A+ fits inv my plans...right at the heart of it.

Thanks, I somehow missed that.

If Pi Zero W uses the Wifi/BT like the Pi 3 does (which is likely) then it's using the hardware UART for WiFi and pinning out a software UART to the GPIO.

I've run Pi 3's with this LCD device tree overlay before, so it *should* work, you may just lose access to the built in Wifi/BT.

Another issue with the Pi Zero is no analog audio output, whereas the A+ has one.

What about charging the battery?  Did you include a mechanism for that or was that beyond the scope?

The video at around 4:55 tells you that they used an Adafruit PowerBoost 1000 charger for this purpose.

https://www.adafruit.com/product/2465

You can see  it being installed into the case next to the USB hub during final assembly.