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Effects of Mistaken Wiring on Teensy

We are debugging our AR4 robot. One thing we had wrong initially was the RJ-45 keystone jacks were swapped for 1 and 3. We mistakenly swapped the cables designated Top and Bottom in the manual. We have since corrected that and while the robot works we are now finding other issues.

Can swapping cables 1 and 3 have a destructive effect on the Teensy itself? Is there a way to test the integrity of the Teensy as we've checked most other components. We want to rule out the Teensy as a problem.

Thanks,

Mark

4 comments

Comments (4)

Chris Annin

Oct 05, 2022

I would not expect swapping cables 1 and 3 to cause any damage to the teensy board.

Mark Meier

Oct 05, 2022

Replying to

Thanks. Yeah we hooked up an oscilloscope to check things out. Everything coming out of the Teensy is fine. And 4 of the motors are working fine, as are the encoders and limit switches. Two of the stepper drivers are not showing reliable output on the scope. The signal in is fine - the signal out is not. I think we had one poorly soldered cable that caused the problems. And we swapped things around as we were testing. So I believe we fried two of them.

I've ordered two new drivers which I'll get Friday and will swap them in by Saturday. Using those motors with other drivers we already have has proven to work so I'm hopeful this should fix everything.

Mark

Johann Voigtlander

Oct 04, 2022

You could put blinky on it :)

Or a better test would probe each affected pin on an Oscilloscope and see if it does what you expect it to.

Or a simpler option is to just replace it

Mark Meier

Oct 05, 2022

Replying to

Hi, thanks. We hooked up an oscilloscope earlier today and believe we have tracked down the problem to two of the stepper drivers. The Teensy seems fine.

Mark

ANNIN ROBOTICS

Effects of Mistaken Wiring on Teensy