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Originally Posted by Excelsior
We are having problems getting this particular sensor to work. We are currently testing it with an o-scope, and it appears that all our wiring is done correctly, but we are getting no output at all.
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I wired up one of our Allegro sensors with a couple of capacitors and resistors on a teeny bit of proto-board. After a false start trying to test it out with a gear having too-small teeth, our sensor was working great Saturday morning. It seemed quite happy with the gears in an AndyMark shifter, which means it should work fine with the similar gears in a kit gearbox as well (our kit gearboxes are installed on the kit chassis and would be rather inconvenient to open up for testing).
Hoever, after lunch on Saturday, it wasn't working any more. I replaced the sensor with the other one, and it didn't work either. I had a couple of students double-check the wiring to make sure it matched the documentation. I took it apart and reassembled everything in a nicer arrangement with a PWM connector. They still didn't work. They haven't worked since. I can't figure out why. I am discouraged. We will probably use something else to measure the robot's speed.
Sorry, no.