A differential drive is the most basic drive to make which consists of two sets of wheels that can be driven independently.

To turn the vehicle (or robot) the LEFT and RIGHT wheels are rotated at "different" speeds or in “different” directions.

Motion LEFT Wheel RIGHT Wheel

Forward Counter Clockwise Clockwise

Backward Clockwise Counter Clockwise

Rotate LEFT Clockwise Clockwise

Rotate RIGHT Counter Clockwise Counter Clockwise

Components:Power Supply- Transformer and

rectifier circuit

Motors

Control box

Chassis

Power Supply:

Our power supply consists of the rectifier circuit and the transformer.

A rectifier is an electrical device that converts alternating current (AC), current that periodically reverses direction, to direct current (DC), current that flows in only one direction.

Transformer:A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors.

To make a simple differential drive, a simple transformer with following specifications can be used:

1 Amp, C.T. -12 V.

Transformer:

Rectifier circuit:Our power supply consists of the rectifier circuit and the transformer.

A rectifier is an electrical device that converts alternating current (AC), current that periodically reverses direction, to direct current (DC), current that flows in only one direction.

POWER SUPPLY (RECTIFIER CIRCUIT)

THE RECTIFIER CIRCUIT

Bridge Rectifier circuit:

USES OF RECTIFIER CIRCUIT Rectifier circuit is used to convert Alternating Current

to Direct Current.

We get Alternating Current as Power Supply in our homes, but electronic components in robots use Direct Current.

Power Supply Circuit

Motors:Motors used to make differential drive robot are the simple DC motors .

Though we can use motors used in toy cars for our purpose .

Electrolytic capacitors have to be connected keeping in mind the polarity

Shorter terminal is negative

Control box: To control the locomotion of the robot, we need a

control box. It comprises of two push-button switchesand two two-way switches. Another method is to use two three way switches for the two motors.

Connections can be made in such a way that the left switch gets connected to the left motor and the right switch gets connected to the right one.

Multi strand wires can be used to connect the motors and the switches.

Push-button switch: Two-way switch:

3 Way Switch Circuit

Chassis:The chassis (and the wheels) can simply be cut out from the toy-cars easily available in the market by separating the lower part of the car from the upper one and removing the gear box from it.

For more details, please refer to the link:

http://www.youtube.com/watch?v=kFoGBIqIqoM

HAPPY BOT MAKING!!!

Thank you