WeMos D1 Mini Pro 16MB

All ESP8266 boards running MicroPython.
Official boards are the Adafruit Huzzah and Feather boards.
Target audience: MicroPython users with an ESP8266 board.
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mcauser
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WeMos D1 Mini Pro 16MB

Post by mcauser » Wed Aug 31, 2016 3:09 pm

WeMos have released a D1 Mini Pro.
  • ESP-12F replaced with onboard components, no metal cover.
  • 16MB flash (128Mbit)
  • Built in ceramic antenna + external connector
  • CP2104 USB-UART (changed from CH340G)
  • Same dimensions as D1 Mini, compatible with existing shields
  • Lighter and thinner than D1 mini
  • USB + reset buttons moved to the top of PCB
  • $1 more expensive than D1 mini
https://www.aliexpress.com/item/WEMOS-D ... .56.5Zx1NW
$5 USD

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pythoncoder
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Re: WeMos D1 Mini Pro 16MB

Post by pythoncoder » Wed Aug 31, 2016 4:00 pm

Odd that the chip isn't shielded: their other products have a WeMos branded, shielded chip. Odder still it doesn't appear on the WeMos official site. I smell a rat.
Peter Hinch

quantalume
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Re: WeMos D1 Mini Pro 16MB

Post by quantalume » Wed Aug 31, 2016 4:20 pm

I ordered a couple, so we will see what this "rat" looks like. I like having the antenna connector as I put all my IoT devices in metal boxes.

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deshipu
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Re: WeMos D1 Mini Pro 16MB

Post by deshipu » Wed Aug 31, 2016 7:49 pm

pythoncoder wrote:Odder still it doesn't appear on the WeMos official site. I smell a rat.
This is consistent with how their other products first appear at Aliexpress, and only after a couple of days on their website. I think the website is being updated by someone who is quite busy with other things too. It was like that with the motor shield too.

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pythoncoder
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Re: WeMos D1 Mini Pro 16MB

Post by pythoncoder » Thu Sep 01, 2016 8:48 am

Perhaps I'm being too suspicious, then - but I gather there are a lot of dodgy clones of WeMos devices. I think abandoning shielding represents a decline in build quality and I doubt an unshielded module can achieve FCC approval.

The antenna connection is a great improvement.
Peter Hinch

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deshipu
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Re: WeMos D1 Mini Pro 16MB

Post by deshipu » Thu Sep 01, 2016 9:44 am

I have noticed another curious thing looking at the photo of the new board. There are a lot of vias on the ground fill -- a standard practice to bring the ground planes on both side of the board together, to avoid noise and to improve thermal conducting. Except there is a no ground fill on the other side -- the vias just hang in the air there:

Image

Not sure if this is a design mistake?

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pythoncoder
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Re: WeMos D1 Mini Pro 16MB

Post by pythoncoder » Thu Sep 01, 2016 1:11 pm

deshipu wrote:...Not sure if this is a design mistake?
Surely: I can't imagine a good reason.
Peter Hinch

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Roberthh
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Re: WeMos D1 Mini Pro 16MB

Post by Roberthh » Thu Sep 01, 2016 2:49 pm

For me it looks like the board has more than 2 layers. If you look at the Pins tx, rx, d1, d2, d3, there is a faint shadow of a lower layer at both sides, but no copper on the respective top levels.

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mcauser
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Re: WeMos D1 Mini Pro 16MB

Post by mcauser » Thu Sep 01, 2016 11:27 pm

I'll post some high res photos once mine arrives

jovijuan
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Re: WeMos D1 Mini Pro 16MB

Post by jovijuan » Wed Sep 07, 2016 3:42 pm

Look at the fiducial, TX pin or ceramic antenna. There are for sure mor layers, probably 4.

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