I've done some research but can't seem to find an answer to my specific problem.
I'm using an Arduino as a beam-break sensor. In order to do that it modulates the IR LED at 38kHz by code and listens for this signal on the sensor pin. Now, I want to increase the range of this system to 15m using a retroreflector on the other side. In order to do that I need more power on the LEDs than the 20mA the Arduino can output.
As I understand it I will need a transistor to do this.
I have ordered these LEDs
And these TIP120 transistors
Will I be able to accomplish having 4 LEDs running through this transistor at 100mAh each and then have the Arduino modulate the transistor at 38kHz so the combined output of all LEDs is modulated?
I already have a 12v power supply in place so that will be the supply voltage for the system.