Using Arduino > LEDs and Multiplexing

Proximity with IR emitter and detector

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Chagrin:
http://www.arcfn.com/2010/03/detecting-ir-beam-break-with-arduino-ir.html

Be careful and note that your IR receiver is not designed to output a continuous signal; see page 5 of the IR receiver's datasheet and it will show that when it detects a continuous beam it will only show a signal for about .0013 seconds.  You need to turn off/on your IR beam intermittently to keep testing for an object.

Boffin1:
Heres an experiment I did with chopping the 38 Khz from the Arduino, I was using it to send data.

http://arduino.cc/forum/index.php/topic,128825.0.html

max246:
I might to know the analog value to get if the signal is far away or close to the receiver, in that way I should be able to calibrate with a piece of glass or I am wrong?

Boffin1:
the only way you can measure signal strength with an IR module, is to see at what range ( or strength of LED pulses ) it fails to output anything.

Are you going to detect the same target each time ?, as different materials have different reflection...

max246:
Well, the project will be something like that: http://www.youtube.com/watch?v=h5n0rw8wo14 but instead of the piece of plastic, there will be a piece of glass.
On the top of this glass I want to put a cup, business card, plate, etc... and the IR should detects it!

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