Param Aggarwal writes here.

A Touchpad using Plastic and Aluminum Foil

The easiest, cheapest and fastest way in which we could implement a touchpad was to use simple metal strips horizontally and vertically. When the user touches, the two strips come in contact and this is detected by a micro controller. This data is then sent to the computer.

Our touchpad.

The aluminium strips.

Tape used as insulation.

Visualization on the computer.

Materials: Aluminum foil, plastic sheets and tape.
Software: Processing and Arduino IDE.
Hardware: Arduino USB Board.
Code: touchpad-arduino.c touchpad-processing.c
Made by Mukul Bharti and Param Aggarwal.