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[Reply #30 on:]

Here is a PDF from FTDI regarding filtering of VBUS: USB Hardware Design Guidelines for FTDI ICs (PDF)

[Reply #31 on:]

Rev B of the vinciDuino has been ordered. We have currently ordered 10 to try them with what we think is going to be the final version.

It looks great!

[Reply #32 on:]

I think I've managed to incorporate most of the changes suggested. Improved USB power filtering, better isolation of AREF, more complete labeling. I did not separate analog and digital power supply buses. But reading up on the D+ and D- routing for USB changed those paths to be very parallel and somewhat isolated.

Next I need to figure out how to use github to make the files available and give proper credit to all that helped make this relatively easy and painless.

[Reply #33 on:]

Very nice board, I like it. It looks very good.
Perhaps a would change the value of the USB 0.1uF cap for 10nF to filter out hight frequencies that you might be getting. You already have 0.1uF close to the AVR supply inputs. You'll have to measure it first to see what is getting through.
Also make sure that the PWMs are supported by timer outputs on chip.
I like the sirigraphy, if we do a re-spin of the vinciDuino I may takes some ideas from you.
Nice job there.

[Reply #34 on:]

Could you not run SDA/SCL out to the new locations as well? No harm done and may be useful for new shields.

That got me thinking, are there many shields out there that expect SDA/SCL to be in the old A4/A5 position? I would suspect that eventually shields would simply make use of the new locations?

[Reply #35 on:]

Yes, eventually the new locations will be used.  Many existing I2C capable shields will use the A4/A5 positions tho.

[Reply #36 on:]

Thought I would share with you chaps that I've received Rev A.1 of the vinciDuino.
This board has several improvements with respect to RevA:
- RX/TX LEDs are fully compatible with Leonardo
- There is a thermal dissipation area on both sides of the board to avoid regulator over heating, tested with 2.5W power dissipated and temperature didn't raise to more that 50ºC over ambient.
- Additional filter added for higher frequencies on power supply, both for USB and external power
- Some routing and layout improvements, i.e. more isolation of reference lines.
- ISP is fully aligned with respect to original Arduinos, this will provide compatibility with newer shields that use the ISP header for SPI connectivity
- Increased some pads to simplify soldering, this is great for people wanting to solder their own.
- Added minor changes to serigraphy, main one is the open HW claim and the CC BY-SA license on the board.

I have managed to get 1MB/s data through put on the USB link with the board, which is not bad at all.

Here is an image of the board ticking away, home you like it.

I have spare PCBs, Kits and assembled board, should you be interested please PM me.

[Reply #37 on:]

So Rev B has finally arrived and up and running.

The board is currently undergoing some tests but it looks very good. These boards, will be released soon, but you can find the entire project documentation in the regular place.

Here are some pictures of the board.

[Reply #38 on:]

My boards are in! Now I have to find some ATmega32U4. Any idea who has a good price and reasonable shipping to Canada? I know there is Mouser and DigiKey, where Mouser has a significantly better price. Any other sources for these? I will also need some ATmega1284P-AU but no single quantities available at Mouser

[Reply #39 on:]

You can try avnet.com, futureelectronics.com, newark.com,

[Reply #40 on:]

I had not thought of Newark. Shipping is a flat rate $12 (DigiKey and Mouser is $8). But if they have everything in stock is still a great options.

[Reply #41 on:]

Post some pictures of the boards!!! Eager to see them!

[Reply #42 on:]

Here they are...   And no, this is not a true representation. They are square and flat, they look pretty perfect. Should have used something better then the little point and shoot.

Next to find out if they actually work as intended...

[Reply #43 on:]

Looks good. I can't see a regulator, is it USB power only?

BTW that curvature is called barrel distortion and it's common with zoom lenses, even the good ones.

______
Rob

[Reply #44 on:]

Yes, it is USB power only. On second thought I could have provided the power option and a jumper to select. Certainly a lot of empty real estate.

I have a couple of lenses for my SLR that have way less distortion. But it is much harder to get close with proper lighting. Using a flash makes some pretty nasty reflections or shadows, even with diffusion. Am not setup for indoor closeups, love nature, landscapes and people photography. I used to have a scanner, it worked great for boards.