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Author Topic: Arduino Mega, Screw (Terminal) it  (Read 16974 times)
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and schematic


* Mega2560_Screw_shield_sch.png (75.57 KB, 2407x1214 - viewed 132 times.)
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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Hows this look for a start?

Wow Robert,

You do really have a flash of genius!

It seems to me an excellent job, ... YES !!! I trust you!

If you develop it, I'd like to be your first customer, no matter the price. Aruino MEGA2560 Screw Shield by CrossRoads Serial Nr. 000001 for Billy !!!

Sincerely,
Billy    smiley
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I'd buy one.
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I'd buy one.

YES!

See, right now I am plugging some 24AWG wires in the MEGA2560 outputs, and twice that many Kynar AWG30 wire wrapped to 1N4001 diodes to the sense (input) pins. They seem to hold allright but flaky.

The Screw Shield would make them completely secure and ELEGANT!

« Last Edit: August 24, 2012, 01:11:12 am by bibre » Logged

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Does anyone have a clue as to a shield for the mega that would allow a 40 pin cable, short but long enough to access the other I/O on the mega... I have an LCD (Itead) and a shield for my mega but there is NO access to anything under that shield...
I would hate to make one... 40 dollars or so??? the time isn't an issue just a one of or two of circuit board is more than I want to pay. Any Idea's?

Doc
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Guess I'll finish up the design then.

Doc, not really clear what you are after. You mean like a 40 pin header that could used in place of the 36 pins on the end of the board?
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Thanks Robert!    smiley

Please let me know.
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I came across this thread while trying to source the same thing. I've been told about a Mega screw shield here

http://www.aqualed-light.com/?sec=home&id=1758

You will have to run it through a translator if you don't understand Portuguese. I was trying to find an online shop so I didn't have to email for an invoice, but this is all I've found so far.
Bing translates it as
Quote
Main characteristics of Screw Shield for the Arduino Mega:

-Works on any Arduino Mega 2560/ADK/1280/Other/Clones.
-Can be stacked with other shields over.
-All pins of the Arduino Mega are replicated by terminals with screws being so simple to make any link without welds.
-Have extra for signs of terminals GND, 5V, 3.3 V and VIN in order to easily feed on other external circuits.

General appearance:
What is not clear is what sort of wires or wire terminations it accepts.  Maybe the slots beside the screw heads are where the wires go or maybe there are conventional round holes not shown in the photo.
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These kinds of parts
http://www.dipmicro.com/store/DG126-3P
Slightly smaller was designed in, 3.5mm vs 5mm.
Wires go in horizontally, the screw holds them in.

There are other variations as well.
Search digikey.com for Phoenix, then select "terminal blocks - wire to board", then filter on 0.138"(3.5mm) for pitch.

Or you can add pins in the holes if you'd prefer, or solder wires right to the holes.

I haven't ordered yet, will look at adding these, maybe on the unpopulated side.
"-Have extra for signs of terminals GND, 5V, 3.3 V and VIN in order to easily feed on other external circuits."
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Does anyone have a clue as to a shield for the mega that would allow a 40 pin cable, short but long enough to access the other I/O on the mega... I have an LCD (Itead) and a shield for my mega but there is NO access to anything under that shield...
I would hate to make one... 40 dollars or so??? the time isn't an issue just a one of or two of circuit board is more than I want to pay. Any Idea's?

Doc

Hi there.

I had that same needs, so I decided to build one for my project.

It will be multiplatform, and will go for testing soon. Arduino Mega 2560 R3 is also supported.

I can leave a 3D photos of it.

Top:



Bottom:



It supports Itead and TFT pinout and is built with two tft sockets to support the smaller landscape versions, and the bigger 5" version in portrait.

Besides this, I've added RTC to it that can be completly disconnected if needed.

If everthing goes well, this will be available soon.
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Thanks for info Robert  smiley

An email reply from aqualed-light.com confirms they are using terminal blocks very much like that (they are in pairs rather than triples) and that they might add the extra R3 pins on a future version.
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Ok, routing cleaned up, names added, board size trimmed over the USB/power connector.
Any comments before I let it rip with iteadstudio for 10 boards?
Size is 125mm x 77mm.


* mega_screw_shield_layout.png (68.67 KB, 941x495 - viewed 96 times.)
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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Excellent Robert! It looks correct to me.

Just one comment, ... set aside one for me, please!  smiley-wink
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Billy     http://www.z-world.com/operations/gbremer/

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Yes, of course Bill!
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I will commit to one as well.
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