Optical Dist sensors
dn
dn at dlogtech.cuc.ab.ca
Tue Mar 5 04:18:20 GMT 1996
Gerald Luiz wrote:
> Right. I was actaully trying to say that I didn't understand the coding on
> the Nissan b/c it does not have black/white patterns...just holes/slots.
> They must detect the width of the pulse (slots different widths) to mark
> 60/120 etc. I wonder if the end of a slot corresponds to 60 deg or the
> beginning of a hole. I expect the former.
Are the slots radial or circular? If they are radial, they may be just
positioned every x degrees and give a pulse when they pass by the sensor.
If they are circular, it may be that they use a Gray Code scheme, which
gives a unique binary position indication for each pattern of holes. With
this setup, there would have to be at least 3 sensors, corresponding to
3 sets of semicircular slots. With the radial method, there would only be
1 sensor. In either case, the sensors/light sources would be arranged in
pairs, one on each side of the disk, and where there is a hole, the light
would shine through and activate the sensor, no hole would block light and
the sensor would be off.
regards
dn
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Darrell A. Norquay Internet: dn at dlogtech.cuc.ab.ca
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