New Dragon? and case to fit it

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Just got my Dragon yesterday.
It appears that there has been a board revision.
The Dragon board I have is slightly different from all the other photos I've seen. (See attached photo).
I highlighted the obvious differences.

Anybody know what all has been updated?
I guess I'm curious if the new revision is a bit more robust than earlier versions.

Also, just wondering if anybody has found a case that has mounting standoffs that align with the new holes in the PCB.

I'm not planning on using the prototyping area so I'm looking for a fully enclosed case.
I found a blog where a guy notes a case that fits the PCB perfectly, except the standoffs don't align with the new holes in the PCB.
http://www.wanderingmind.ca/2006...

This case is really nice because you can get it in a translucent so that you can still see the LEDs.

Just wondering if anybody else has found anything better.
If not I'll get the translucent Serpac H-65 from Digi-key and glue in some new standoffs.

Note: for all you guys that want/need to use the prototyping area or use a ZIF, you can get this case with a battery compartment opening.
The sides of the case will have to be cut as a ZIF is bigger than the case is wide but it still might work and be a nice solution to keep everything covered when not in use.

--- bill

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Mounting holes!! And maybe a fix for the sensitive power regulator!! Cool.

On the underside there is a number (near the usb jack). Mine has:

A.0601.3.1000.C

Is the new one any different?

Regards,
Steve A.

The Board helps those that help themselves.

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Oops, well I guess I should have also posted a photo of the back of the board. See photos
The board revision is: A08-0936.D
And for those with over 40 eyes, I also attached
a closeup of the sticker.

I do have higher res photos if anyone wants
better images.

--- bill

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WTF? Mounting holes! You didn't Photoshop those? They are really there?

Quote:
I'm not planning on using the prototyping area so I'm looking for a fully enclosed case.
I think someone here even posted a link to some page where someone saw off the prototyping area and got away with it.

Stealing Proteus doesn't make you an engineer.

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Here's another box used for the Dargon + an Dragon-safe verobaord added for port protection: http://www.aplomb.nl/TechStuff/D...
This website also explains the problems with the orginal Dragon power supply circuit. That's proably why they have redesigned the Dragon power supply (the area in the yellow circle of your first photo).

Quote:
March 2009: Kasper Pedersen emailed me the explanation. Here it is (in my own words):
Lots of parts on the Dragon are specified for operating on 4.5-5.5V.
The USB-spec however says:
Minimum DC voltage at host connector 4.65V
Minimum DC voltage at peripheral 4.40V
Minimum DC voltage at peripheral connected to BusPowered hub 4.150V
Using a boost regulator allowed the designer to meet the usb "must work @4.15V" requirement.
BUT: he forgot to implement an undervoltage lockout. Which results in an increased current consumption when the USB-voltage is low, which results in more current to get that boosted output @5V, the increased current lets the incoming voltage even drop further ...... do I need to iterate more ;) ?? So in the end the boost-regulator will blow itself when the USB-power is not powerfull enough. Funny huh ? With a powerfull USB-power the Dragon doesn't fail, but using a not-so-powerfull one, it kills itself. Dtagon suicide :S
If you are such an unlucky person, do the modification described above. But make sure that you give the board a decent 5V supply. A powered hub is a good source. I use one with uses a wall-wart that can supply 1.5A. Never short on currentsupply.
...

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The old one wasn't RoHS (mine doesn't seem to be) so couldn't legally be imported into the EU. The current one is, according to Farnell.

Leon

Leon Heller G1HSM

Last Edited: Fri. Jun 5, 2009 - 09:28 AM
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ArnoldB wrote:
WTF? Mounting holes! You didn't Photoshop those? They are really there?

Quote:
I'm not planning on using the prototyping area so I'm looking for a fully enclosed case.
I think someone here even posted a link to some page where someone saw off the prototyping area and got away with it.

Yep the holes are really there.

I also thought about sawing off the prototype area but I wasn't really too excited about
ripping up brand new board.
I do remember reading somewhere in the manual that everything in the prototype area is isolated and not connected to anything else on the board.
It was just kind of subtly telling you its ok to saw it off if you want to....

But after seeing the translucent Serpac case, it looks like the way to go for me.

--- bill

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Can we expect enhancements at the InternalRC-8MHz-debugWire issue?

https://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=572785#572785

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For anybody still looking for a case, and not planning on using the prototype area,
here is another case that I've located that should fit the board. It is almost the same size as the Serpac. It has rubber on the sides.
It fits differently and will require gluing in some stand offs to hold the board. It looks like it will allow the board to slide all the way up to the faceplate.

It is made by Hammond - the 1553 series.
Here is the link: http://www.hammondmfg.com/1553co...

--- bill

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Can you please the dimensions, preferably on a drawing?
What's the dimension for hole to hole, edge to hole and edge to edge?

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Quote:
Mounting holes!!

Wonderful!

And the redesigned p/s makes it a wee bit more easy to take this Dragon on the road as no USB hub with it's own p/s is needed. If that is a sturdier redesign that is...

Now, if I order a(-nother) Dragon from somewhere, how do I know it's this revision? Imagine being this excited only to get another of the old ones... :shock:

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AndersAnd wrote:
Can you please the dimensions, preferably on a drawing?
What's the dimension for hole to hole, edge to hole and edge to edge?

Are you wanting dimensions of the Dragon or the cases?

I don't have a drawing for the Dragon but here are some quick measurements I took with a set of calipers.
(Should be very close but don't hold me to them)

Board:
53mm x 104mm ~(2.09" x 4.1")
Hole to hole centers.
44mm x 78mm ~(1.7" x 3.07")

The holes are centered 3.5mm from the edge
where the USB connector is.

The rest of the dimension can be calculated.

The link I posted for the Hammond case had links to the drawings that even have really cool 3D animations of the cases.

Digi-key and Mouser sell them in several
different color combinations.

Here are some links which also have links to the case diagrams.
(There are more, just do a search)

http://search.digikey.com/script...

http://www.mouser.com/Search/Ref...

http://search.digikey.com/script...

Clear panel for Serpac:
http://search.digikey.com/script...

One thing that might be useful is that since
the LEDs are near the edge of board by USB connector, it isnt necessary to have a full translucent case to see the LEDs.
As long as you mount the Dragon up to the side with the flat insert and use a translucent or clear "window" insert, then you should be able to view the LEDs.
It will mean buying or making an extra window insert, but it would allow using a non translucent case.

--- bill

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So I'm finally getting around to mounting my Dragon in a Case. I have two options, the Serpac H-65 case and the Hammond 1553 Case.

The hammond will require the case mounting screws, which are metal, to be very close if not touching sides of the PCB.

My concern was that originally I had thought the Dragon was a 4 layer board (internal power & gnd layers) which means metal touching the side of the PCB could be very bad. But after looking at the edge of the board, I now think that the board is merely 2 layers.

It's a bit hard to tell with the dark masking.

Anybody have any thoughts/revelations on this?

--- bill

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For all of you waiting with bated breath as to how to mount a Dragon in a new small sized protective case, I have created an instructable detailing the options and the steps involved.

Here is the direct link to the instructable:

http://www.instructables.com/id/A-protective-case-for-the-Atmel-AVR-Dragon/

And a link the instructable pdf file:
http://www.instructables.com/pdf/A-protective-case-for-the-Atmel-AVR-Dragon/A-protective-case-for-the-Atmel-AVR-Dragon.pdf

--- bill

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