Use a pencil drawing as a capacitive touch sensor with Arduino
Instructables user Alan Chatham has described an interesting method of creating customised user input - with a pencil drawing. Using his method you can create a capacitive touch sensor with an Arduino, a couple of parts and a drawing created with a graphite pencil. Although it's simple - you could create all sorts of images and diagrams with a pencil, cover with clear adhesive film and have a custom-made touch interface. Watch the following video for a great demonstration:
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This is a great project to show younger people what is possible with an Arduino-type board. And a great starting board is our Freetronics Eleven - the Arduino-Uno compatible with low-profile USB socket, onboard prototyping space and easy to view LEDs: