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'[EE]: Shaft Angular Encoder'
2001\02\21@043845 by John Maud

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I am looking to implement an encoder to determine the angular position
of a shaft which rotates between 0 and 90 degrees, before feeding the
data into my PIC.  Maximum speed for this travel is about 0.9 seconds,
during which i would need to sample the position.  8 bit resolution
would be fine.  Cold start from any position.  Costs are an issue too.
Any comments and suggestions?

Regards,

John

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2001\02\21@055940 by Thomas C. Sefranek

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John Maud wrote:

> I am looking to implement an encoder to determine the angular position
> of a shaft which rotates between 0 and 90 degrees, before feeding the
> data into my PIC.

What does this mean?

>  Maximum speed for this travel is about 0.9 seconds,
> during which i would need to sample the position.  8 bit resolution
> would be fine.  Cold start from any position.  Costs are an issue too.
> Any comments and suggestions?

!ttach a pot. to the shaft, attach +5 and ground, read the position with
an A-D.

>
>
> Regards,
>
> John
>
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 |  __O    Thomas C. Sefranek   spam_OUTtcsTakeThisOuTspamcmcorp.com
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2001\02\21@062700 by G. Cadman

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I think that he is implying that shaft speed maximum is ~ 1.745 radians per
second.

G

"Thomas C. Sefranek" wrote:

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2001\02\21@082745 by Thomas C. Sefranek

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"G. Cadman" wrote:

> I think that he is implying that shaft speed maximum is ~ 1.745 radians per
> second.
>

I'm asking what he means by  "before feeding the data into my PIC".

{Quote hidden}

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 |  __O    Thomas C. Sefranek  .....tcsKILLspamspam.....cmcorp.com
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2001\02\21@165335 by Gennette, Bruce

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face
The 'normal' way to do this is to salvage a rotary encoder out of a dead
mouse and fix up some way to rotate it from the shaft (a thick rubber band
makes a dandy drive belt for slow turning shafts like yours.  You'll get 2
good encoders for about 5 minutes work from a (free) piece of junk - way
cheaper than buying them.

If the shaft doesn't always start from a known position at power up you may
need to store the last position it was in at power down.  (Requires
occassional manual calibration).

Lots of info is available from various web sites on reading direction and
speed from a rotary encoder through 2 PIC inputs.  Go look.

If you need a single input data stream use one of the smaller PICs to read
and pre-process the data for your main PIC.  (should only cost a dollar or
so - uses same oscillator and power supply as main PIC).

Bye.

{Original Message removed}

2001\02\22@134551 by Peter L. Peres

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Probably two magnets a bridge type Hall sensor and one or two A/D
channels. And a thermistor. You are trying to resolve ~0.3 degrees. That
would require an optical encoder with multiplying gear (expen$ive) or a
very expen$ive linear pot. The Hall sensor solution will likely be cheaper
than both. You can also use a rotating vane capacitive sensor.

Peter

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