Hall sensors accuracy

Other Hardware Sensors
1

Hi:

I need to control a (HO railroad) turntable that should stop at given angles. Using a hall effect sensor sounds good but how accurate is it? Will it work with a, let's say, 1/10mm accuracy?

Are there any practical examples out there?

Thanks!

2

How about LEDs on light sensors? You could mask off the LEDs to make them laser like.

3

Using a hall sensor for precise positioning is only feasible if you take steps to shield it from external magnetic fields which is a tricky mechanical problem when you only have hobby level tools.

A LED slot switch or a simple wiper contact like those used in multimeter switches may be easier solutions.

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4

Take an array of three light sensors, masks with 1-3 openings, and you have 7 codes. The openings line up with the light sensors when the turn table is in position; which one(s) is triggered tell you which position your turn table is in.
Increase to 4 sensors for up to 15 positions.
Cheap LDRs are probably good enough for this.