Quick line follower question

[Xyver]

If I was to make a line follower robot with, say, 5 IR LEDS and 5 IR receivers, then does that mean I need to use 5 input pins on an Arduino?  Or is there some way to combine them...

[waltr]

The easiest is to use 5 inputs pins. There are multiplexing methods but would require a few pins to control therefore you wouldn't save pins for only 5 inputs.