Re: Anyone have experience with infrared LEDs?


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Posted by RandyT on 18, 2001 at 11:06 AM:

In Reply to: Re: Anyone have experience with infrared LEDs? posted by Andrew Beley on 17, 2001 at 8:06 PM:


: to increase the range and sensitivity, the first thing(and easyest) you should try is maxing out the ouput of the ir led, this can be done by looking at the max current(~10-50mA) for the led and usign the right resistor

: current(amps)=voltage(volts)/resistance(ohms)

: also if you bought the packeage with the ir led and ir phototransistor for RS the led is probably fairly weak, they also sell high power IR leds, getting one of thous might help

: you can also increase the sensitivity of the phototransistor by using a normal transistor (a 3904 is a good one, easy to find and cheap). ime not shure how the snes pad works(if th ebuttons are active hight or low or if they have to be closed like a keyboard)

Your post made me remember something I heard a while back. LED's can handle much higher than normal power (and thus output), if the input to the LED is rapidly pulsed. This may or may not be applicable depending the duty cycle required for this application, but it's a thought.

RandyT



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