This is for several uses on a robot. I am looking for a sensor that provides a code for the angular position of a shaft - such as a steering shaft or a disk that rotates a camera mounted on it. The idea is to determine the angle when the shaft is NOT turning. This is not for detecting high-speed cha…

If you have access to the end of the shaft you can mount a magnet and use a special Hell-effect angle encoder. What you want is called an Absolute Shaft Encoder.

johnwasser: If you have access to the end of the shaft you can mount a magnet and use a special Hell-effect angle encoder. What you want is called an Absolute Shaft Encoder. Well, the hall effect sensor requires rotation - it senses speed. I do want an absolute shaft encoder, but not in the ol…

it senses speed. No, it senses magnetic fields. You need a shaft encoder. I don't know of any solid-state ones, so a Gray code encoder is probably the only sensible absolute position sensor.

AWOL: it senses speed. No, it senses magnetic fields. You need a shaft encoder. I don't know of any solid-state ones, so a Gray code encoder is probably the only sensible absolute position sensor. OK. I'll keep my eyes open. Thanks very much.

You have not said what kind of resolution you need. Austria Microsystems makes the Hall Effect absolute encoders in 8, 10, 12, an d 14 bit resolution (256, 1024, 4096, 16384 steps): http://www.ams.com/eng/Products/Magnetic-Encoders/Rotary-Encoders DigiKey has the AS5263 (12-bit) for $10.22 each: h…

johnwasser: You have not said what kind of resolution you need. Austria Microsystems makes the Hall Effect absolute encoders in 8, 10, 12, an d 14 bit resolution (256, 1024, 4096, 16384 steps): ams OSRAM is a global leader in innovative light and sensor solutions | ams OSRAM DigiKey has the AS5…

Placing a gear around a steering shaft and using a stepping-motor driven worm gear, what would be a realistic resolution? If your stepper does 200 steps per revolution and your worm gear has 100 teeth that is 20,000 positions. Perhaps you would be happy with 4096 positions. How do they connect …

johnwasser: Placing a gear around a steering shaft and using a stepping-motor driven worm gear, what would be a realistic resolution? If your stepper does 200 steps per revolution and your worm gear has 100 teeth that is 20,000 positions. Perhaps you would be happy with 4096 positions. How do…

Angular position sensor?

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johnwasser July 16, 2012, 9:42pm 4

AWOL:

special Hell-effect angle encoder

"Hall Effect"

Oops.

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Angular position sensor?

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