Re: Anyone have experience with infrared LEDs?


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Posted by Dan on 17, 2001 at 4:22 PM:

In Reply to: Re: Anyone have experience with infrared LEDs? posted by RandyT on 17, 2001 at 3:50 PM:

: The output power of the transmitter
: The sensitivity of the receiver components themselves?
The only transmitter/receivers I've been able to find are at Radio Shack. Short of hacking
apart four old 4 remote conrols and 4 VCRs, I'm not sure of where I can find stronger parts...

: The width of the "cone" of energy produced by the transmitter (ie. 10 degrees, 20 degrees)
Not sure what's meant by this, I'll look into it.

: Angle of the transmitter in relation to the reciever
I've adjusted it as far as I can to lengthen the range.

: Geometrical shape of the reflecting object
: The surface material of the reflecting object
It's a person's hand...

: If the receiver is tied to a microcontroller, you might have to bump up the voltage on the output side of the receiver to something just under what will cause the circuit to go to an "on" state. This would have the net effect of increasing the sensitivity of the reciever, but would be hard to prevent a false signal from ambient light sources.
I've been using an SNES controller connected to my computer as the base for the whole thing,
with each receiver connected to its own button. When enough IR light is shined on a
receiver, then the circuit closes for that button and signals that that button has been "pressed".

Thanks for the help, I'll see if I can find some better parts...
Dan


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