MT32-Pi and the Pi Zero 2 W

cursedverses
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MT32-Pi and the Pi Zero 2 W

Unread post by cursedverses »

You may or may not have heard, but the Raspberry Pi team have released the Pi Zero 2 W. There are few differences between this and the Pi 3, the most significant being the Clock speed (200MHz slower at 1GHz), 512MB RAM and of course the price (~£15)

Is this a reasonable alternative to the Pi 3 for an MT32-Pi? And is anyone thinking of experimenting with this?
Xbytez
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by Xbytez »

It looks like Dale (mt32-pi Dev) is already on it :D

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Re: MT32-Pi and the Pi Zero 2 W

Unread post by Xbytez »

Update from Dale on the Pi Zero 2 W.

caffeinekid
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by caffeinekid »

Hopefully it can be OC by 200mhz and made to work as good as a 3A. I have yet to get a Mt32pi, but this might make me take the plunge.
held
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by held »

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MacDragon
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by MacDragon »

I certainly plan to somehow mount a pi zero 2 to my hodgepog mister, assuming it works well enough..
drgruney
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by drgruney »

held wrote: Sun Oct 31, 2021 7:04 pm128-6.jpg
That's an SDRAM module.
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by held »

drgruney wrote: Mon Nov 01, 2021 1:56 pm That's an SDRAM module.
I know, but I was wondering if the Pi Zero 2 W could be hooked up the same way.
I don't care about the hat if there is a way to integrate it like the SDRAM Module.

Would sure be nice :D

EDIT:
These videos have nice benchmarks that shows that the RPI3 and the RPIZ2 do not differ that much.
Afaict (and I'm no expert) it would be on par with RPI3 with +150mhz overclock
https://youtube.com/watch?v=Jm8RiqAdHQE
https://youtube.com/watch?v=5RB29g18m-I
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MacDragon
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by MacDragon »

a shim board could certainly be made to go from the arduino header to the pi header so that it plugs straight in, barring needing to get power from somewhere else I guess.
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by held »

At this point I am wondering how much performance gain is possible by running essential features only. So no screen, no output connectors, just the minimal requirement for proper gaming. And would it be enough to compensate for the 150mhz difference?
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by MacDragon »

Don't think I actually appreciated just how small the zero 2 is, having just got mine finally.
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NegSol
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by NegSol »

Building a custom MT32-PI 😆
I will use a "lcd-less" Zero 2 based design - fully integrated in my old case.
The alpha software of MT32-PO works (Munt only) :P

I will also design a new front of the case to get access to the MT32 Pi sd-card.

I had no user port on my old IO-Board V5.2. It will integrate nicely :mrgreen:
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NegSol
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by NegSol »

All done now - Pi Zero integrates nicely :) (Switch toggles the power of the pi)
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Solskogen
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by Solskogen »

There's a new version of MT32-pi that works nicely with the Pi Zero 2
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NegSol
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by NegSol »

Solskogen wrote: Mon Dec 13, 2021 11:10 am There's a new version of MT32-pi that works nicely with the Pi Zero 2
:mrgreen: Everything works :) even the new FTP - really nice! :mrgreen:
MacDragon
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by MacDragon »

My somewhat more bodge setup.
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viperman3
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by viperman3 »

I put together a board layout for the Pi Zero 2 W formfactor.
The schematic used was directly based on MT32-pi interface board v2.1 by Alexey Melnikov.
yamimaya makes and sells his version on tindie store (https://www.tindie.com/products/taviens ... pberry-pi/) but it's been out of stock.

The USB and Header are mounted on PCB Back while Switches, OLED, SMD Resistor are mounted on the PCB Front.

Disclaimer: If you decide to make this project, you assume all responsibility of the outcome positive or negative. Review the schematic and board images provided before commiting to making the project.

Part List:
QTY Digi-Key Part Number Descriptin
1 WM25179-ND CONN RCPT USB3.0 TYPEA 9POS R/A
2 CKN9071-ND SWITCH TACTILE SPST-NO 0.05A 12V
1 13-AC0805FR-7W100RLCT-ND RES 100 OHM 1% 1/4W 0805
1 401-2001-ND SWITCH SLIDE DPDT 300MA 6V
1 S7123-ND CONN HDR 40POS 0.1 GOLD PCB

1 I2C SSD1306 OLED 0.91 Inch Display Module (AliExpress)
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PCB Back View
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Schematic based on MT32-pi interface board v2.1 by Alexey Melnikov
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german_user
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by german_user »

I think he changed the design a little, because I found more resistors underneath the display.
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by german_user »

I don't know if it would work, but personally I would find it much nicer if the OLED display would show the current time in sleep mode instead of powersaving ...
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by viperman3 »

german_user wrote: Wed Jan 12, 2022 3:48 pm I think he changed the design a little, because I found more resistors underneath the display.
Which design are you refering to with the additional resistors (MT32-pi interface board by Alexey Melnikov or yamimaya's version sold on tindie store) ?
I don't see any new revision by Alexey Melnikov to the MT32-pi interface board. It's still at v2.1.

The OLED display does have resistors under the board but that should not interfere with the current layout
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Lukage
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by Lukage »

I've also made a very bodge setup on DIY two layer board to test Pi Zero 2W out. Only if I made display+buttons aligned with MiSTer buttons+leds and move Pi Zero 2W to the back and align SD card with board edge..... To be fair I was trying to make it as slim as possible, and made it wider with two additional mounting holes at the last moment. I realized this after I had PCB done, so used it anyway.
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allyourbasekris
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by allyourbasekris »

I'm quite liking it, I 3d printed a little stand and attached it to my acrylic case with some standoffs. It's all quite neat.
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german_user
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by german_user »

viperman3 wrote: Fri Jan 14, 2022 3:20 pm
german_user wrote: Wed Jan 12, 2022 3:48 pm I think he changed the design a little, because I found more resistors underneath the display.
Which design are you refering to with the additional resistors (MT32-pi interface board by Alexey Melnikov or yamimaya's version sold on tindie store) ?
The Version on tindie Store refered to the pictured PCBs
drgruney
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by drgruney »

Are there any alternative displays that can be used? I love the project but would like something larger.
cursedverses
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Re: MT32-Pi and the Pi Zero 2 W

Unread post by cursedverses »

I've been using a 2.42" OLED (with a modification to switch it from SPI to I2C. I don't have the link to the OLED anymore but can point you to this video if you wish to try it:

https://youtu.be/uPWzL_MZ4q4
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