Quote:
Originally Posted by electroken
A useful gear tooth sensor that wires directly into a digital input is the Allegro Microsystems ATS667LSG. We like to use them when we need speed information but not direction information and we don't need the highest resolution. We also like that they're $6.
In the photo below an ATS667LSG is mounted to a carrier board and installed in the side of a Cim-u-lator gearbox, with its face about 0.03" from the output gear. It gives us a nice, clean 27 pulses per output shaft revolution. The sensor on top of the right motor is just posing for the photo.

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Electrotoken, am I right in thinking that the magnets in the hall effect sensor in the ATS667LSG detects the disturbances in the fields from the magnets mounted in the sensor package as the steel gears in the gearbox rotates through the field? Did you just connect it into one of the digital inputs on the Digital Sidecar? The datasheet does not seem to show any sort of calibration. Did you just stick it on, connect the wires and run?