[clug] O/T Digital Position sensing
keith.goggin at bigpond.com
Thu Nov 5 00:23:50 MST 2009
David Tulloh wrote:
> Ben Nizette wrote:
>> On Tue, 2009-11-03 at 11:11 +1100, Keith Goggin wrote:
>>> I need to know the position of a shaft ...
>> The /simplest/ thing for absolute position I can think of given the
>> limited range is a potentiometer and ADC.
> They come packaged together and are generally referred to as encoders.
> Farnell sells them from $10,
> Incremental (relative) encoders are much cheaper and start from $1.50.
> I would recommend one of those over hacking up a mouse. You get a
> better end result with known specs for only a few bucks.
Ok Thanks all, I've got a bit of reading to go on with. I particularly
liked Andrew's "Good Use of Technology"
Responding to the various requests for more detail, my project is to
monitor a throttle shaft setting in an automotive environment. The arc
of rotation is about 90 Degrees. The accuracy required is about +/- 2
Initially I only need to identify two points in the range of throttle
settings but provision for more would be useful.
My initial attempt involved a cam/micro-switch setup but I found engine
vibration made this impractical.
I see Jaycar Electronics have Hall Effect Kits so next time I'm in
Fyshwick I'll have a look.
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