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Topic: How would I wire a Infrared detector? (Read 1 time) previous topic - next topic

skeeter_mcbee

I just got back from Radioshack with a baggie with the contents of a pair of infrared detectors and emmiters. I have no clue how to wire the detector. They both look exactly like a pair of 5mm LED's. If I hook the detector up like a photoresistor, or a pushbutton, I get a variable, but it never changes. If I hook up the emmiter like a regular LED, it gets really hot. I assume that's normal?
-skeeter_mcbee-

robtillaart

Quote
If I hook up the emmiter like a regular LED, it gets really hot. I assume that's normal?

No not normal, you must restrict the current with a resistor just like with LEDs.

If you have an old webcam you can remove the internal filters and then you can see the IR LED working. Most digital cameras will work too.

Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

robtillaart

check - http://www.ladyada.net/learn/sensors/ir.html -

do your IR stuff looks the same?
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

Chagrin

Your IR detector might be a phototransistor, photodiode, or just an IR led with a colored shell. Do you have any more precise specifications on what the part is? Product link?

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