Description: Andreas' Making / Hacking / Tinkering Part of Life
3d (9538) laser (3843) justmigrate (11) rrbb (1) fablabmuc (1)
The MPR121 is a small little chip that can be used for creating touch sensors that can easily integrated into your Arduino projects as this article nicely explains:
http://bildr.org/2011/05/mpr121_arduino/
But the MPR121 can do more! You not only can read touch / no touch binary values, but also read the measured capacity, which is a measure for the distance of your hand: