Large number of off-board connections.

Hey guys. I'm still working on my display for my racing sim.

I plan to build a shield for the MEGA which will have my 5 shift registers and supporting components, and 8 resistors for the 7-segment displays. Possibly a smaller shield as a breakout board on top of that one to make all the connections to external wires.

The obvious solution is to move some of the shift registers to the display itself, which will reduce wiring. But, for now i'd like to keep the displays fully modular. I may move the registers in the final design.

My main problem will be connecting this shield to the main display unit, that will sit on top of the wheel. Right now i've got 27 connections that need to be made, and I may possibly be adding a couple more to the design.

What's the best way to wire this up? I was thinking either a ribbon cable, or perhaps something similar to a CAT5 cable, but with more connections. Then a giant array of male headers on each board to connect the cable.

You could get 3 of these:

http://www.sparkfun.com/products/10647

Or just one and cut three pieces off of it and rig your own custom ribbon cable up with some headers.

Pretty simple DIY project for your DIY project.

Hi, Depending on length, these flat ribbon cables with pre-done ends are my favorite: http://arduino-direct.com/sunshop/index.php?l=product_detail&p=185

(20 and 30cm lengths are usually stocked) DISCLAIMER: Mentioned stuff from my own shop...

Also maybe see the cable/connection stuff here: http://arduino-info.wikispaces.com/Cables

Panici: Hey guys. I'm still working on my display for my racing sim.

I plan to build a shield for the MEGA which will have my 5 shift registers and supporting components, and 8 resistors for the 7-segment displays. Possibly a smaller shield as a breakout board on top of that one to make all the connections to external wires.

The obvious solution is to move some of the shift registers to the display itself, which will reduce wiring. But, for now i'd like to keep the displays fully modular. I may move the registers in the final design.

My main problem will be connecting this shield to the main display unit, that will sit on top of the wheel. Right now i've got 27 connections that need to be made, and I may possibly be adding a couple more to the design.

What's the best way to wire this up? I was thinking either a ribbon cable, or perhaps something similar to a CAT5 cable, but with more connections. Then a giant array of male headers on each board to connect the cable.

how about 4 cat-6 cables? each cable has 8 wires and can be easily plugged/unplugged and (replaced if damaged) http://www.sparkfun.com/products/643 http://www.sparkfun.com/products/716

terryking228: Hi, Depending on length, these flat ribbon cables with pre-done ends are my favorite: http://arduino-direct.com/sunshop/index.php?l=product_detail&p=185

I'll need more then 30 cm depending on where I mount the Arduino. I've got individual cables like that already. I want preformed ends so I don't have to connect 30 little cables every time.

scott_fx: how about 4 cat-6 cables? each cable has 8 wires and can be easily plugged/unplugged and (replaced if damaged) http://www.sparkfun.com/products/643 http://www.sparkfun.com/products/716

Seems kind of bootleg to use 4 cables. There must be something else.

scott_fx:
how about 4 cat-6 cables? each cable has 8 wires and can be easily plugged/unplugged and (replaced if damaged)
http://www.sparkfun.com/products/643
http://www.sparkfun.com/products/716

Seems kind of bootleg to use 4 cables. There must be something else.
[/quote]

lpt cable?
http://www.officedepot.com/a/products/126450/Cables-To-Go-DB25-Serial-Parallel/;jsessionid=0000ZjlfakHXTOqmbPGQoDbjKl0:1659q37ia?cm_mmc=Mercent--Googlepla--Technology%20Networking_Cables-_-126450

I just ordered a bunch of different colors of 30awg wirewrap wire. Planning to use to make connections on the perfboard.

Could I also use it for off-board connections? I’ll have a larger power and ground wire.
What’s the best way to bundle this stuff together?

Panici: I just ordered a bunch of different colors of 30awg wirewrap wire. Planning to use to make connections on the perfboard.

Could I also use it for off-board connections? I'll have a larger power and ground wire. What's the best way to bundle this stuff together?

i guess you could spin a few pairs together with a drill then bundle it in something like this (various colors are available) http://www.parts-express.com/pe/showdetl.cfm?Partnumber=082-364 you can clean it up with some creative use of shrink tubing.

scott_fx: i guess you could spin a few pairs together with a drill then bundle it in something like this (various colors are available) http://www.parts-express.com/pe/showdetl.cfm?Partnumber=082-364 you can clean it up with some creative use of shrink tubing.

Looks like a good idea to me!

Why can't you just use ribbon cable? 34-way is a standard size.


Rob

Ribbon cables ... http://www.mpja.com/Ribbon-Cable/products/305/

I may still use ribbon cable. Although it wouldn't look too great for the finished setup. Bundled and wrapped wires would look much better I think.

Are you plugging into headers? I like using these from Pololu.com terminated wires & crimp connector housings. Can buy terminated wires, or just the terminations & make your own. Here's a short one I made to use with a promini, male on one side, female on the other Many sizes available http://www.pololu.com/catalog/product/1905 http://www.pololu.com/catalog/category/71 http://www.pololu.com/catalog/product/1931