SWETHA PATIL

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Project:

•Title :DTMF robot
Description : Dual tone multi frequency robot, this robot is being controlled by mobile phone. When a button is pressed on mobile, a tone is generated. This tone is decoded by the decoder to get 4-bit binary output. This 4-bit binary output is used to control the robot. The decoder used is MT8870 to decode the tone and the motor driver IC L293D is used.

•Title :Shoe box projector
Description: Portable, economical projector made out of shoe box. A convex lens is placed at one end of the box & smart phone/tab is used to place inverted on the other end inside. When the image falls on the lens, the image gets enlarged and inverted, and is displayed.

•Title: Water level indicator.
Description: This circuit is useful for automatic controlling of water level while filling the container .As the water level crosses particular predefined level, the corresponding LED glows. Timer used is IC 4066, which is a high speed COMS. It can switch any analog signal and also digital.

•Title: E-candle.
Description: An electronic candle which can be blown off with a whiff of air. The circuit uses NE555 timer IC operating as a bistable multivibrator. Whenever the trigger pin is pulled low, the output goes high and remains high, till the threshold pin is pulled high. When the air is blown over the microphone, the capacitance changes and the LED stop glowing.