Subject:
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Re: Rotation sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 4 Feb 2000 13:58:19 GMT
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Viewed:
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1692 times
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In lugnet.robotics, j.troelsen@tu-bs.de writes:
> Hi !
>
> I am trying to make a gray code rotation sensor using hardware from an old
> mouse.
>
> The circuit needed to drive the photo transistor should be the same as for
> your rotation sensor URL: http://www.umbra.demon.co.uk/sensor1.html.
> I do however don't quite understand the photo resistor driver part. Are You
> sure the circuit drawing is correct ?
>
> Thank you in advance for your answer
The circuit shown, is rather basic, but perfectly acceptable. The
phototransistor draws a varying amount of current according to the incident
light level. During the 'sense' phase of the Lego cycle, the voltage being
returned is read, with the wires disconnected from the 'power' drive, and
instead connected via a 10k resistor to +5v. The phototransistor and it's
resistor pull the level down, allowing a reading to be made.
Best Wishes
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Message is in Reply To:
 | | Rotation sensor
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| Hi ! I am trying to make a gray code rotation sensor using hardware from an old mouse. The circuit needed to drive the photo transistor should be the same as for your rotation sensor URL: (URL) do however don't quite understand the photo resistor (...) (25 years ago, 3-Feb-00, to lugnet.robotics)
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