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Dart Board Hack (Help with wiring)
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RandyT:


I'm really going to have to give all of this some thought.  8x11, no problem.  10x10...might be a problem...

But user selectable matrix size??  I dunno...

Any chance of getting some pictures of that 10x10 mylar matrix?

RandyT

SirPoonga:

--- Quote from: RandyT on April 18, 2005, 08:26:19 pm ---But user selectable matrix size??
--- End quote ---
Fusion Disaster:
RandyT: Yeah I'll post up some pics tonight. I was going to post some last night, but the digital camera batteries died. Going to stop off today and get some new ones.

Here is something worth noting. I found this site today. It's a write-up on how a few guys from Harvard hacked their electronic dartboard and wired it up to a parralel port. They then wrote up some custom software for it. It's a really interesting project. Maybe we can use their design? Or at the very least it might help RandyT work on designing an interface for us.

http://web.archive.org/web/20021017065130/http://ice.fas.harvard.edu/~sander/dip/
http://www.eecs.harvard.edu/~mcarbone/projects/281paper.pdf

Let me know what your thoughts are on this.
Fusion Disaster:
Looks like this article was also posted up on Slashdot.com a while back:
http://slashdot.org/article.pl?sid=02/02/20/0836216&mode=thread&tid=137

One guy had some interesting info to share:

--- Quote ---"This project is impressive -- i saw that they're not EE's, so they had a hard time figuring out how the contact sheets are picking up dart throws. They came up with a good work-around, but i'll explain how the thing was supposed to work -- (i'm doing a similar implementation to this for my senior EE project).

WIRING:

Contact sheet 1:
Basically, the grid is broken down into two halves. one of the contact sheets connects full wedges (ie, 20, 19, etc) across the single/double/triple boundaries together with another wedge on the other half. Therefore, there's 10 wires (20/2 = 10)

Contact sheet 2:
contact sheet two connects all the point values on each half...so, for half #1, one wire connects all singles, one wire connects all doubles, etc... one wire connects all singles on half #2, etc...there's 7 wires total, because one of them is used for bull's eye

Implementation (time division multiplexing):
send a logic pulse down each of the 10 wires in contact sheet #1 really fast, in a loop. Read as input on the rings...so, if you read that there was a single scored on the first half, just check where you sent the last pulse down -- deduct which was hit.

i dunno, i guess this is boring, but in case anybody was interested :)"

--- End quote ---
SirPoonga:
Yeah, old news.  The meat of the project is no longer online.  Many paralle port dartboard hacks where out in the wild about 4 years ago.

If one could make this USB that's the way I'd go for a commercial project.  For a DIYer there's nothing wrong with lpt port.
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