Hello,

If the devices are so close then you could do as you originally
suggested, and have an LED and detector close to each other.  There is
no better way (unless you tell us a little more about the nature of the
system).

My only further suggestion would be that you consider using an
optoisolator.  These are simply devices that contain an emitter and
receiver in a single package.  They provide good electrical isolation
and are easy to handle and wire up.  With this configuration you can
almost treat the two devices as if they were physically wired together.

Hope this helps,

Andy

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