Datasheet

For most people, that's all you'll need! Our code keeps track of the 12 'bits' for each touch

and has logic to let you know when a contect is touched or released.

If you're feeling more advanced, you can see the 'raw' data from the chip. Basically, what it

does it keep track of the capacitance it sees with "counts". There's some baseline count

number that depends on the temperature, humidity, PCB, wire length etc. Where's a dramatic

change in number, its considered that a person touched or released the wire.

Comment this "return" line to activate that mode:

https://learn.adafruit.com/adafruit-mpr121-12-key-capacitive-touch-

sensor-breakout-tutorial

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