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Speed Control of DC Motor Using MicrocontrollerOral Presentation on

Prepared By-Snehasis Bhar (25301613072)Soumya De (25301613076)Sudip Mondal (25301613087)Department of Electrical Engineering Sir J. C. Bose School of Engineering(Supreme knowledge Foundation group of Institutions)Mankundu ,HooghlyINTRODUCTIONThe aim of developing this project is to control the speed of DC motor.

The main advantage in using a DC motor is that the Speed-Torque relationship can be varied to almost any useful form.

To achieve the speed control an electronic technique called Pulse Width Modulation is used which generates High and Low pulses. These pulses vary the speed in the motor.

For the generation of these pulses a microcontroller (ATmega8) is used to set the speed ranges as per the requirement.CIRCUIT DIAGRAM

WHY AURDINO/MICROCONTROLLER ??The electric and electromechanical methods are less adaptive so electronic techniques are used for speed control.

One such technique is Pulse Width Modulation.

We can easily apply this technique in Microcontroller using Aurdino.

It is easy to compile program with this language.

COMPONENT USED

Arduino BoardMotor DriverDC Motors Batteries

DETAILS OF ARDUINO BOARD

PIN CONFIGURATION OF MICROCONTROLLER

DETAILS OF MOTOR DRIVER

MOTOR DRIVER CIRCUIT(L293D)

H Bridge Circuit DiagramS1__S1S2__S2M+VCCDataS1S200OFFOFF

01OFFON10ON

OFF

11ON

ON

-DC Motor Direction Control10PULSE WIDTH MODULE (PWM)Pulse Width Modulation is a technique for getting analog results with digital means.

Digital control is used to create a square wave.

This on-off pattern can simulate voltages in between full on and off by changing the portion of the time the signal spends on versus the time that the signal spends off.

The duration of "on time" is called the pulse width. To get varying analog values, you change that pulse width.The green lines represent a regular time period. Arduino's PWM frequency at about 500Hz, the green lines would measure 2 milliseconds each. A call to analogWrite() is on a scale of 0 - 255, such that analogWrite(255) requests a 100% duty cycle (always on), and analogWrite(127) is a 50% duty cycle (on half the time).

Any QuestionsADVANTAGESHigher efficiency.

Greater reliability.

Quick response.

Flexibility.

High integration (less space required).DISADVANTAGESMicrocontroller needs software like compiler to insert logics as inputs.

It cannot interface high power devices directly.

It is susceptible to EMI (Electromagnetic Interference), sometimes even produces audible noises.

Speed control is little bit slow due to delay of clock pulse.ACKNOWLEDGEMENTWe wish to express our sincere gratitude to Ms. Srima Nandi, HOD of HU-Department for giving us such opportunity to do a project. We sincerely thank Mr. Vishwanath Gupta, Asst. Prof. of EE-Department for guidance and encouragement in carrying out this project work.

THANK YOU

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