Read data from your Arduino in real time

This file is set up to receive two inputs from your Arduino serial connection (simply separated by a blank). At the moment I'm just passing on the same reading twice (resulting in an unelegant double-plot), but I thought it's useful to keep this format to later send both the IR and red light readings and plot them both.
Merge pull request #1 from PhilipMair/patch-1

Nice! Thanks.