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Immersion Input Matrix Wiring Questions

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mbasile35:
For reference here is how the board is wired...



Alright so I was able to test the inputs like you said badmouth and everything works from the header on the immersion board and from the header on my diode board, but the inputs do not work from the individual headers that go out to the buttons. This leads me to believe that the diodes are the problem. I followed the drawing in the immersion manual so that each switch connects to the anode of a diode and the cathode connects to the scan wire. Did i miss something and my diodes are backwards? Or could it be that my diodes aren't fit for this use?

BadMouth:
Looks like it matches the immersion diagram to me.
I guess it's possible that the diodes could cause a big enough voltage drop that the immersion board wouldn't consider it triggered.
I don't think it's likely, but is possible.

Try connecting just one switch with a diode in-line.
If it works, then the diodes aren't the issue.

Check that project board to make sure that you don't have connections where they shouldn't be.
I'm assuming the white outlines on top show the holes that are connected, but it's worth checking.

That or having scan and sense reversed are the only things I can think of.
Did you make your own cable?  Make sure it connects the appropriate pins on both sides.
(a crossover cable might be required or vice versa)

mbasile35:
Thanks badmouth.  I'll check the single switch thing tonight.  If that doesn't work I'll probably try reversing my scan and sense wires and see if that does anything. Could that have any ill effects on the board if they are in the right position now and switching them makes them wrong?

And yes I did make the cable.  I've checked that and the project board for errors but it can't hurt to check again

Thanks again.  I'll post back tonight with my findings

Edit: just so you know the diagram on the original post
Shows the actual pinout on thw diode board but on the pic of the board where i drew  in the wiring I show the immersion pinout to avoid confusion

mbasile35:
After a frustrating night of checking and rechecking all of my work...I've got input! I ended up finding a few molex pins that weren't crimped well...i guess thats what happens when you don't have the right tool for the job. Anyway the big problem was that my scan and sense lines were swapped. I don't know...i could have swore I followed the diagram in the immersion book to a t. I'm not even going to try to understand where it went wrong. All i know is that it works now and thats all that matters. Huge thanks to badmouth for his input on different troubleshooting techniques.

I'll be getting 18 gauge wire in tomorrow so hopefully this weekend I can wire power to the motor amp section and get that figured out. When I originally tested it I was using cheap test jumpers made of super thin wire and i may have been shorting two pins or something. We'll see!


thanks again
Mike

BadMouth:
Glad it's working.
Do you have part #'s for the connectors you used?

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