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Infrared Variable Output?

I am trying to wire some infrared LEDs to an Arduino. Problem is, the signal from the infrared LEDs has to be able to change variably, like from a potentiometer. What I mean is, I am aware you can read an ouput from an IR LED, then use the Arduino to replicate this and consequently control things, but what if I wanted to ouput a signal that changed, like a potentiometer? Basically, I would like to be able to control some motors speed through PWM by a potentiometer, but wirelessly. I'm not sure if this is possible, and if it is, is there some information I could look into? Any help is greatly appreciated.

iceng7 months ago
The RC integrates the uP PWM  signal to a simple voltage level  which translates to
a variable DC current  through the IR LED  controlling the light intensity. ..

A
led-integratind-fet.jpg
Most IR photo components are built for digital communication like the output displayed in this oscilloscope in this Instructable photo.

http://www.instructables.com/id/Photo-Components-Testing/

You might want to try a DAC and ADC but I think what you are looking for is analog photo components.

Joe
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