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Debugging sensors on a microprocessor can be a hassle and the most used approach is to output the sensor values to a serial monitor. I made a realtime plotting tool which is a better and more visual way of doing the same thing.
I created this software to debug an Arduino Due on my self-balancing robot. To tune the controls of the robot I needed fast feedback to know if I was making progress or not. The video below demonstrates typical use of the realtime plotter: http://www.youtube.com/watch?v=WN2oXuavrWk
More info and code at http://sebastiannilsson.com/en/projekt/realtime-plotter/realtime-data-plotter/