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Forum Index : Microcontroller and PC projects : 64-pin MM+: A new PCB, The HAT Stand

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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10573

Posted: 11:55pm 08 Nov 2017

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By popular demand (of one person

), here is a design for a new PCB for the 64-pin MM+. Copper pour areas are removed for clarity in the picture.

The PCB is the same size as a Pi 3 and will fit in a standard Pi case with all connectors and headers correctly placed as per the Pi.

It includes:

40-pin Pi HAT header with SPI, I2C, COM, PWM ports placed as per the Pi
DS3231 RTC and battery backup
Audio output as per MM+ manual
IR receiver
microSDcard
MicroUSB power and I/F connector
PIC16F1455 console USB I/F and PIC32 programmer
Buzzer
RESET and MODE switches

If this is of any interest, please advise. I'll post gerbers once the first version is tested and any bugs ironed out.
As usual PCBs, in various stages of completion, may be available from WW if he has his arm twisted
Edited by matherp 2017-11-10

IanT

Senior Member

Joined: 29/11/2016
Location: United Kingdom
Posts: 115

Posted: 11:27pm 09 Nov 2017

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Very surprised to see no-one jumping up and down about this - because it sounds very good to me. If WW makes them available - I'll have one.

(so that's two!)

Regards

IanT

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 8283

Posted: 05:50pm 29 Oct 2019

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I've just found this while looking for something else. It's lovely! - and something I'd considered trying. Did it get any further, Peter?

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

Poppy

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Joined: 25/07/2019
Location: Germany
Posts: 486

Posted: 07:45pm 29 Oct 2019

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Great idea, esp. fitting into prefab cases!

Andre ... such a GURU?

goc30

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Joined: 12/04/2017
Location: France
Posts: 435

Posted: 01:18am 30 Oct 2019

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Hi peter

Very good idea. just one question: is-it possible to put 2 jumpers between 40 pins connector and pic32mx for COM1 lines who can inverting rx/tx , that permit to speak between rpi and MM+ via uarts. and others jumpers to isolate SPI bus (in this case, on hat, spi can be use only on board), or connected on SPI2, who permit use rpi as slave. Jumpers can by just small solder jumper
Edited 2019-10-30 11:28 by goc30

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10573

Posted: 08:03am 30 Oct 2019

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MX64HATSchematic.pdf

HAT64MX.zip

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 8283

Posted: 03:01pm 30 Oct 2019

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Nice! I like the way you got the GPIO pins to work out so well. I've just been comparing them with the RPi.

My soldering iron is getting itchy. I might have to get some boards made. :)

Thanks, Peter. :)

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

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