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Forum Index : Microcontroller and PC projects : MM+: Ultimate Backpack PCB?

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Zonker

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Joined: 18/08/2012
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Posted: 12:47pm 23 Oct 2015
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Humm... It looks like one to the SSD1963 types (5" or 7") using the 40 pin interface... And of course panky, your in... I think we still need a BOM on this.. I'm not sure what the total cost of build is..? ...
 
matherp
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Joined: 11/12/2012
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Posted: 09:02pm 23 Oct 2015
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Bill of materials and some notes attached.

I have an error in the wiring of the PS2 connector. The schematic was correct but unfortunately the part downloaded from RS for the connector was wrong, i.e. the pin numbers were incorrectly allocated. This will be corrected in V1.1

The bill of materials specifies all RS part numbers but things like connectors and headers are much cheaper sourced from ebay.

2015-10-24_070201_backpack64doc.zip
 
centrex

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Joined: 13/11/2011
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Posts: 320
Posted: 09:29pm 23 Oct 2015
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Hi Peter
What are the dimensions of the board please.

Cliff
Cliff
 
matherp
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Posted: 09:42pm 23 Oct 2015
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  Quote  What are the dimensions of the board please.


80x100mm
 
matherp
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Posted: 08:17am 06 Nov 2015
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The second version PCBs arrived today and the niggles from the previous version are now fixed.

Gerbers and Instructions/BOM attached - help yourself

2015-11-06_181407_backPack64.zip

2015-11-06_181509_backpack64BOM.zip

2015-11-06_181618_Schematic.pdf
 
matherp
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Posted: 05:40am 13 Apr 2016
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I've been asked about availability of this PCB but am not in the market of building/selling electronics.

However, I'm very happy to make all the design files available:

2016-04-13_152639_Backpack64.zip

This zip includes the V1.3 Designspark files, the gerbers, the BOM (ignore the fact that the file titles include "wifiboard" - this is a legacy of the project I copied from)

V1.3 has two tiny changes from 1.2 which I have been using for all my developments

1. New connection to F_CS on the 40 pin SSD1963 header to allow access to a display mounted serial flash chip
2. RD is now pulled up to 3.3V using a 10K resistor. There is then a shorting link to connect to pin 30. This allows the normal Micromite firmware to be used for the SSD1963 and then CFunctions to access the RD pin to add functionality.

The V1.1 PCB has been used by Geoff as his development environment for the 64-pin MM+. This version had incorrect wiring on the PS2 connector. There are no known issues with V1.2 or V1.3

If any of the forum PCB suppliers want to supply this board that is fine, the design is completely open-source.

All the information on the PCB is in this thread but in summary:


Two layer PCB less than 10cmx10cm so very cheap to have made.

Designed for the 64-pin MX470 (MM+) and can act as a backpack for the following displays with the display mounted to the underside of the board.

ILI9341 (SPI), ILI9163 (SPI: includes plug in access to the SD card pins on a 2.8" version), SSD1289, ILI9325, SSD1963 (any size), S6D0164

It includes an Arduino Uno header which brings out all of the processor pins not already allocated to the TFT displays, touch, SD, Comm1 and 2, PS2 keyboard.

There is a PIC16F1455 to provide a USB console/PIC32 programmer (software available from MicroBlock for non-commercial use) on a type-B connector which frees the MX470's USB conection to be used in host mode (type-A connector) for a keyboard and/or mouse as/when Geoff makes host mode available. Alternatively the board can be powered and accessed via the in-built firmware USB console using the type-A connector.

There is also a PS2 DIN connector allowing direct connection of a keyboard. Of course all these connectors need not be populated on any given PCB.

There is a header for a DS3231 RTC module to connect laying flat on the board.

The layout fully respects the Arduino UNO pin allocation for SPI and I2C and also includes PWM1A and 1B, Comm1, and Comm2 pins.

Dual 5V and 3.3 V supplies are provided and optionally the USB client port can supply the power (link selectable)

The LED pin to relevant displays can be selected between 5V, 3.3V or a PWM'd 5V supply (PWM2A).

All surface mount resistors and capacitors are 1206 size so easy to solder. The processor is mounted on the rear of the board to optimise routing.
Edited by matherp 2016-04-14
 
Phil23
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Joined: 27/03/2016
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Posted: 11:40am 13 Apr 2016
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  matherp said   I've been asked about availability of this PCB but am not in the market of building/selling electronics.

However, I'm very happy to make all the design files available:

2016-04-13_152639_Backpack64.zip



Can anyone add to this thread suggestions on how this information can be used.

Are there companies out there that can provide the board, in low volumes & one offs. Either partially or completely constructed if they are provided with the files @Pmather posted.

By "Partial" completion I mean all the SMD's installed.

Cheers
 
CircuitGizmos

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Posted: 01:45pm 29 Apr 2016
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Peter's Excellent design is available at CircuitGizmos!

TFT Backpack+ PCB

.
Edited by CircuitGizmos 2016-04-30
Micromites and Maximites! - Beginning Maximite
 
JohnS
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Joined: 18/11/2011
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Posted: 08:34pm 29 Apr 2016
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You might like to put in the chip's full name (PIC32MX470F...) so google etc can index it properly. (It would be even better to list the board specs somewhere, akin to other sites selling uC boards.)

Looks a good offer, though.

Any plan to offer it built & tested? Or at least with the SMD items populated?

JohnEdited by JohnS 2016-05-01
 
Phil23
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Posted: 02:19pm 30 Apr 2016
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  CircuitGizmos said   Peter's Excellent design is available at CircuitGizmos!

TFT Backpack+ PCB
.


  JohnS said  Any plan to offer it built & tested? Or at least with the SMD items populated?


Ditto above. That scale of SMD assembly is simply not an option for many of us.

The options it supports for displays sounds superb.

Phil.
 
CircuitGizmos

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Posted: 03:20pm 30 Apr 2016
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Yes... PCB right at the moment. PCB + SMD parts soon.
Micromites and Maximites! - Beginning Maximite
 
palcal

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Joined: 12/10/2011
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Posted: 06:56pm 29 May 2016
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@matherp
Can you confirm the value of caps C12, c14 and C17. The BOM and the schematic say 1uF whereas the RS components part is .1uF.

Paul.Edited by palcal 2016-05-31
"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"
 
matherp
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Posted: 09:16pm 29 May 2016
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  Quote  Can you confirm the value of caps C12, c14 and C17


Should be 1uF (although not critical) - sorry about the part number
 
panky

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Posted: 06:00pm 02 Jun 2016
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@Peter,

Your schematic shows 27pF for C19 and C20 accross the crystal but the BOM gives 22pF.
How critical is the 27pF? I ordered and received 22pF from RS Components - can they be used in leiu of 27pF?
Cheers, Doug.
... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!
 
TassyJim

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Joined: 07/08/2011
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Posts: 5867
Posted: 06:17pm 02 Jun 2016
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22pF should be fine.

Jim
VK7JH
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WhiteWizzard
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Joined: 05/04/2013
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Posted: 09:10pm 02 Jun 2016
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@panky

I have used various crystals with matched capacitor 'requirements' from 12pF up to 27pF. With these I have used capacitors ranging from 18pF to 27pF and all have worked fine with the MM.

To be clear - I may use a 18pF cap on a 27pF spec'd xtal, and have often swapped 27pF's with 22pF's.

Put simply - it will 99.9% certainly be fine

WW
For everything Micromite visit micromite.org

Direct Email: whitewizzard@micromite.o
 
matherp
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Posted: 09:15pm 02 Jun 2016
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Good article on crystal/capacitor matching here

Note that as a simple rule of thumb the capacitors should be twice the load capacitance of the crystal as they are effectively in series
 
panky

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Posted: 01:24am 03 Jun 2016
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Thanks Jim, WW and Peter - used the 22pF caps and am pleased to report all good! Completed soldering all bits to Peters board thisarvo and had the great enjoyment seeing it come alive - my first go at SMD and was lucky enough for it to come up with no errors or reworks necessary.
Great design Peter and nice board CircuitGizmos.
Doug.

... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it!
 
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