Speed Control of DC Motor using Microcontroller

Speed Control of DC Motor Using Microcontroller

Oral Presentation on

Prepared By-1. Snehasis Bhar (25301613072)2. Soumya De (25301613076)3. Sudip Mondal (25301613087)

Department of Electrical Engineering

Sir J. C. Bose School of Engineering(Supreme knowledge Foundation group of Institutions)

Mankundu ,Hooghly

INTRODUCTION The 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 Board Motor Driver

DC Motors Batteries

DETAILS OF ARDUINO BOARD

PIN CONFIGURATION OF MICROCONTROLLER

DETAILS OF MOTOR DRIVER

MOTOR DRIVER CIRCUIT(L293D)

• H – Bridge Circuit Diagram

S1

__

S1

S2

__

S2

M

+

VCC Data S1 S2

00 OFF OFF

01 OFF ON

10 ON OFF

11 ON ON

-

DC Motor Direction Control

PULSE 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 Questions

ADVANTAGES

Higher efficiency.

Greater reliability.

Quick response.

Flexibility.

High integration (less space required).

DISADVANTAGES

Microcontroller 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.

ACKNOWLEDGEMENT

We 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

Any QuestionsThinkng…