Smart Touchpad

By Electronics Club

Touchpad is the choice for any user interface today. It is found in many popular devices such as iPhone, laptops, PDAs, etc. There are various underlying technology involved in it. Capacitive sensor, which is mostly used in laptop touchpads, where there is a change in the capacitance of the device when a finger is in its proximity. Pressure sensor is another to name in this area. Another approach is to interrupt the light falling on a sensor by a finger. The latter has inspired the Takneek problem statement for Embedded Design this year.

Smart Touchpad

Problem Statement

To make a touch pad that is capable of recognizing decimal digits 0 to 9 from gestures of finger over it. It can be possible made using suitable arrangement of light sensors (like LDR or TSOP), where touching a particular sensor would cut the light intensity falling over it, and thus touch sensing occurs. The recognized digit has to be displayed suitable by using either of following LCD / 7-Seg-Display / LED array.

Extra Features

You are free to add any extra features to the above basic problem statement, that can fetch you some extra points. Some suggestions are:

  • Hover rather than touch
  • Intuitive gestures / multiple gestures
  • Extending to some of the alphabets.
  • If LCD is used then changing backlight according to: low surrounding intensity (in dark) >> low backlight; the phenomenon which is usually preferred on LCD screens.


Circuit Specifications

  • You are allowed to use only ATmega 16 microcontrollers or equivalent

General Rules

  • Students have to participate in teams that can have a maximum of three members
  • All teams issuing components from Electronics Club are required to submit a caution money of Rs.500/-

Judging Criteria

  • The effectiveness of the algorithm used in solving the problem statement
  • Understanding of the basic concepts involved
  • The simplicity and ease of use of touch pad aesthetics of the display
  • Neatness of bread boarding and soldering
  • Extra features
  • Presentation


Ankit Gupta
341, Hall 3
Anubhav Singla
H-113, Hall 5
Siddharth Garg
266, Hall 2