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Forum Index : Microcontroller and PC projects : Schematic for E28 / Explore 28

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MustardMan

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Joined: 30/08/2019
Location: Australia
Posts: 175

Posted: 05:11am 01 Jun 2021

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I am looking for a schematic for the Explore 28 (as sold by micromite.org & rictech.nz), but have not been able to find one.

I have found the 'LCD Backpack' schematic, but have found nothing on the Explore 28.

I have tried searching this forum, but for some reason I get a "fatal error" searching for 'explore28', nothing when I ask for 'e28' (the 'search' button does absolutely nothing) and lots of useless results from 'explore 28'.

Any pointers appreciated.

Thanks,

Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 9757

Posted: 05:22am 01 Jun 2021

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Yep, I can help with that.
Standby.....

Here you go:

E-28 (1D) diagram.pdf
Edited 2021-06-01 15:25 by Grogster

Smoke makes things work. When the smoke gets out, it stops!

MustardMan

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Joined: 30/08/2019
Location: Australia
Posts: 175

Posted: 05:58am 01 Jun 2021

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Thanks Grogster, you're a true champion!

MustardMan

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Joined: 30/08/2019
Location: Australia
Posts: 175

Posted: 03:27am 02 Jun 2021

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As an aside, the PIC32MX270F256 appears to be almost identical to the PIC32MX170F256, the latter being used in the Explore 28 board/s. The difference appears to be USB support and the loss of a couple of general I/O pins as a result.

With the current shortage of chips, the '170 is becoming hard to find. Will the interpreter run un-modified using a '270?

...I have a few '270s up my sleeve (although I also note they are becoming just as hard to find).

Cheers,

palcal

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Joined: 12/10/2011
Location: Australia
Posts: 2006

Posted: 03:52am 02 Jun 2021

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Grogster may have some for sale, he sells the E-28.
If not I have one I can let you have, send me a PM ifyou want it.

Edit. Just checked, RS Components and Element14 have them.
Edited 2021-06-02 13:59 by palcal

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2831

Posted: 04:55am 02 Jun 2021

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To use the USB port use this version of MMbasic.

https://www.thebackshed.com/forum/uploads/kiiid/2017-06-20_094554_Micromite-MX270D.X.production.hex.zip

More info. on this page

https://www.thebackshed.com/forum/ViewTopic.php?TID=9358&PID=143940#143940

MustardMan

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Joined: 30/08/2019
Location: Australia
Posts: 175

Posted: 06:08am 02 Jun 2021

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@palcal
Thanks for the info on the suppliers. I am about to start a new design and the 28 pin PIC is a good choice. The 44 pin version chip is too big for my application. Although a little overkill (memory/speed), code testing & development with MMbasic is going to save me *SO* much time.
I have a couple of PIC chips (both types), but at present no Explore 28 board itself.

@phill99
Thanks for the tip on those downloads. I'm onto it!

EDIT: Looks like the code for the '270 version (both the PLCC44 & SO28) is quite old (2017). Won't affect me though.

Cheers,
Edited 2021-06-02 19:09 by MustardMan

Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3308

Posted: 12:14pm 02 Jun 2021

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MustardMan said As an aside, the PIC32MX270F256 appears to be almost identical to the PIC32MX170F256, the latter being used in the Explore 28 board/s. The difference appears to be USB support and the loss of a couple of general I/O pins as a result.

With the current shortage of chips, the '170 is becoming hard to find. Will the interpreter run un-modified using a '270?

Yes, MMBasic will automatically detect the MX270 and adjust to run exactly the same (with two missing pins as you noted).

Geoff

Geoff Graham - http://geoffg.net

Turbo46

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Joined: 24/12/2017
Location: Australia
Posts: 1646

Posted: 09:33pm 02 Jun 2021

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Geoff said MMBasic will automatically detect the MX270 and adjust to run exactly the same

I didn't know that. Can you use the USB as the console as well?

@MustardMan, Geoff wrote and article on the E28 for Silicon Chip. They may have the bits to build one if you don't want to buy one from Grogster.

Bill

Keep safe. Live long and prosper.

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10609

Posted: 09:47pm 02 Jun 2021

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Quote I didn't know that. Can you use the USB as the console as well?

Not with standard MM2 firmware which already uses all flash available

Turbo46

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Joined: 24/12/2017
Location: Australia
Posts: 1646

Posted: 12:02am 03 Jun 2021

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Thanks Peter, I thought that would be the answer but I had to ask.

Bill

Keep safe. Live long and prosper.

MustardMan

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Joined: 30/08/2019
Location: Australia
Posts: 175

Posted: 11:03am 03 Jun 2021

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@Turbo46
Thanks - I ordered a few (prebuilt) from Rictech in NZ earlier today.

@Geoffg
Thanks for the concise answer, exactly what I was looking for.

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