Capacitive touch sensors are entirely in the domain of DIY, requiring little more than a carefully-chosen conductive surface ...

The sensor forms an image and OpenCV detects the actual touch configuration. It appears you can use the raw data from the Arduino, too, but it might be a little harder.

Makers, looking for a project to keep them busy this weekend may be interested in a new DIY Arduino arcade game project which uses LEGO bricks and Arduino ...