Richard Rasker wrote:
Joerg wrote:

Richard Rasker wrote:
...
But I guess I'll try to crack it open, although I seriously doubt if I
can find anything -- if only because cracking it open will certainly
disturb anything blocking the light path anyway.

But you could then fire up the LED again, pulse it with something, take
a photodiode from your parts bins, hook it up to the scope and see if
stuff is received.

It's even simpler than that: any webcam and most cheaper digital cameras
can "see" an IR LED's output (this is also widely used to check remote
controls).


If you want to check remotes the photodiode on a scope is easier, heck,
even an LED will be sensitive enough as a photodiode. Then you can see
the transmission frequency and also all the codes. Makes it quite easy
to detect a short or bad button. I had that with the remote from an
80-year old. Pressed two different keys, same code came out. Opened it,
crud all over the board. Cleaned it, worked. "Oh, yeah, well, ahm, I
kinda did spill a can of V8 juice over it the other day".

--
Regards, Joerg

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