Make yourself this very simple electronic toy. Its a gyro toy. While making this you will
get hands on experience on the three followings about science.
1) Gyro , 2) Newtons 3rd Law, 3) Persistence of vision.
You will also come to know how to find the center of a circle.
To make it you need
1) a small CD
2) one small ( 3cm) plastic pipe.
3) A small 3V DC motor
4) A Li-Po battery.
optional - One LED and one 100 Ohm resistor.
Few tools to make it like hot glue gun, soldering iron, cutter etc.