Re: IR proximity detector - Digitizing Probe?

If there was a way to detect the time delay, I wonder if this could
be used for a poor man's digitizing probe?

Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Bill Vance <ccq@x> wrote:
> On Tue Mar 30 22:10:52 2004 Trend wrote:
>
> >I was thinking about adding an IR proximity detector to my cnc
router ((or
> >even an ultrasonic one) (to see how far the vertical axis is away
from the
> >material.. so both transmiter and receiver is next to each other)
> >Something like:
> >http://www.acroname.com/robotics/parts/R132-IS471F.html
> >Just seems like a fun project.
> >
> >Anyone know what would be the easiest solution? I need something
that would
> >be easy to wire up.. as I am still getting use to electronics :)
> >
> >thanks!-Lee
>
> You might try the optical fiber, "Y", connector route. Drill the
tinyest,
> shallow hole you can make in the top of an LED. Insert a piece of
viber optic
> cable into the hole, with a drop of clear glue on it, and hold it
till it takes
> a set. Thats the transmitter side. Do the same with a photo
transister; Thats
> your receiver side. Now whatever length of optical cable you
connect to the
> bottom of the, "Y", can be routed anywhere you like, and used as
both transmit
> and receive, simultaneously. Driving the LED with an astable, or
PWM
> oscillator will give some control over sensitivity. This was
originally used as
> the sensor circuit in an audio object detector, with the detector
end of the
> fiber optic cable mounted on the tip of a blind man's cane.
>
> Bill
>
> --
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