Re: HELP WITH OPTICAL LIMITS!

Hi Dave, ( dont hook up power to the wires without some series
resisters(1k,10k) as protection, until you determine if is has
intergral
series R's )

Are these slot type switches? If they are, make some initial
assumptions like you have with red/blk maybe LED power. Use
a 9v battery and a 1K ohm resister in series to apply power to
these lines. Put a 10K in series with the white and green lines
(either side)also across the 9v. Take a volt meter and and
read the voltage across the white and green.
With nothing obstucting the slot,
the detector should be active and have a very low voltage
across it approx 0volts ( assuming a phototransistor
or photo mosfet)Put something in the slot to block the
emitter/detector, and the voltage(grn/wht) reading should
go to 9v. If you dont see this behavior, swap the white and
green wires. test again. Try all permutations of connection
this way until it behaves as described.

Hint:
If you have a digital camera with the LCD( or a camcorder),
you can see infrared emission with it, so place a small piece
of white paper in the slot at an angle to reflect the light
upward so you can observe it with the camera LCD. This way you
can pinpoint which side is the LED.

Good luck
-Lee

--- In CAD_CAM_EDM_DRO@y..., "D.Pag" <graf-x@a...> wrote:
> Can anyone help me with implementing optical switches for
limits/home.
> They are four lead blk/red (assuming power) and white and green on
oppsoing side.
> Any ideas on the hookup and general power requirements???
>
> Thanks, Dave
>
>
> [Non-text portions of this message have been removed]