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Originally Posted by cdawzrd
So... They are sprocket-tooth encoders. Check.
How do we wire them? They have 4 pins, I haven't checked but it seems like they might fit on a PWM cable, but that only has 3 pins, so is it possible to wire it with only 3 pins or do we need to make new cables?
--Jonathan
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To wire this sensor, I suggest you check out the spec sheet that is linked numerous times in this thread. A link to the sheet is on the FIRST site at:
http://www2.usfirst.org/2005comp/Specs/gths1.pdf
For a basic overview, looking from the top of the sensor, the pins from left to right are supply, output, int. connection, and ground. it can take 4.5 to 24 volts input voltage (you would probably use 12), and the output will provide a digital signal whenever a gear tooth passes by (whether or not the output is high or low when a tooth goes by depends on the direction of rotation).
CHECK the spec sheet before you try it. It is helpful to see the diagram and check for yourself.
Scott