There are few things more frustrating than being in the middle of working on a project ... a touch sensor but can’t get your hands on one, [Alan Chatham’s] tutorial on simple DIY capacitive ...

[James Eckert] got his hands on a Freescale MPR121 capacitive touch sensor. The chip in question speaks I2C and senses up to twelve simultaneous capacitive sense electrodes; break-out boards are ...