Time to drag some old-school fun into the 21st century with this Arduino-powered "Etch-a-sketch" device by Instructables user "mizchief100". It's a combination device with an Arduino reading the positions of two potentiometers, whose data is sent back to a PC running processing that takes care of the drawing on the monitor. There's also an accelorometer fitted to the Arduino control unit - so you can erase the screen by shaking the controls. Although there isn't too much hardware it's very well executed, for example:
This tiny 3-axis accelerometer module can operate in either +/-1.5 g or +/-6 g ranges, giving your project the ability to tell which way is up. Ideal for robotics projects, tilt sensors, vehicle data loggers, and whatever else you can dream up. For more information and to order, click here.