Re: Newbee: Optocoupler to BasicStamp

I just ordered some 4N28s. While I am waiting for them to arrive I thought I
would play around a bit.
I just cracked open a mouse and removed the photo transistors, but cant get
the circuit to work.

I have the center leg (base?) going to the input on my Stamp it is also
pulled up by a 10K resistor.
I have tried grounding both (not at the same time) other legs of the photo
transistor, straight to ground and also through various resistors.

I cant get the Stamp to detect on/off states. Any suggestions on where my
circuit went wrong?

Thanks all again.



"John Popelish" <jpopelish@xxxxxxxx> wrote in message
news:MKadnXBkJ_paHNnenZ2dnUVZ_tKdnZ2d@xxxxxxxxxxxxxxx
> Sam wrote:
> > Thanks again for your help.
> >
> > The Fairchild site has 12 optocouplers. I dont really understand the
specs.
> > Anyone specifically I should be looking for?
> >
>
> All 12 are slight variations on a theme, any of which would do what
> you want. They just have slightly different current transfer transfer
> ratios (amount of output current relative to the LED input current.
> If you find a source for any of these or anything similar, they will
> work for your application.


.

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