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Depending on the joints you use, you could use optocouplers. Having two pieces of metal in contact can be unreliable. They could get corroded, or develop increased electric resistance...
[...] Except I want to be able to swap things on and off of it quickly, without plugging and unplugging wires. Anyway, one way I though of was to use the things that hold the modular parts on to the locomotion section to communicate. For example, if I used bolts to connect other parts to the locomotion section, I could connect a wire to the one side of the bolt, then connect a wire to the nut on the other side, in the other part. Would something like this work? Of course I'd have to use a very conductive metal, but would there be really bad noise if I did something like this?
Hi,Quote from: corrado33 on May 05, 2010, 01:33:05 PM[...] Except I want to be able to swap things on and off of it quickly, without plugging and unplugging wires. Anyway, one way I though of was to use the things that hold the modular parts on to the locomotion section to communicate. For example, if I used bolts to connect other parts to the locomotion section, I could connect a wire to the one side of the bolt, then connect a wire to the nut on the other side, in the other part. Would something like this work? Of course I'd have to use a very conductive metal, but would there be really bad noise if I did something like this?You want to bolt/unbolt a piece of equipment, remove nuts and the like, but you think a plug, eg. a modular plug or a Molex will take too much time to remove?
If you use a PCB with a grid of pads of say 2mm each and then mount some ball shaped pogo pins in the bottom of your auxiliary devices, with slightly less than the 1/4" travel sticking out, it would go together not unlike the contacts of a battery handle on a DSLR camera.Pogo pins are originally intended for ATE (Automated Test Equipment) and comes with various points, some with one point, some with a grid of points, but for your use, the ball shaped "points" will be best.
Remember that the pogo pins need to be mounted isolated, so a nylon center block in the add-on may be a good idea.
[...] I was thinking further down the road, when I wouldn't be swapping the auxiliary devices on and off. (I.E. it'd be automated) [...]
What did you mean by this? I know the isolation part, but a nylon center block, is this to make sure nothing else touches the pogo pin?