The purpose of this project is to control the speed and direction of DC Motor using Microcontroller and H-bridge techniques.  This system makes use of PWM (Pulse Width Modulation) technique to control the speed of motor from 0% to 100%. The main controlling device of the whole system is a Microcontroller. Control buttons, DC motor with L298 motor driver and LCD are interfaced to Microcontroller. The data from control buttons will read by Microcontroller. Microcontroller processes the data and control the direction and speed of the DC motor through L298 by generating the PWM signal and also it will display the motor direction and PWM signal on LCD. To perform the task, Microcontroller is loaded with an intelligent program written in embedded ‘C’ language.          

Objectives:

1. To design and develop a microcontroller-based DC motor speed and direction control system.
2. To control the DC motor speed using PWM (Pulse Width Modulation) signals.
3. To change the motor rotation direction using control buttons.
4. To interface an L298 motor driver for efficient DC motor operation.
5. To display the motor direction and PWM (speed) value on a 16×2 LCD.
6. To implement the complete control algorithm using Embedded C programming in the microcontroller.
7. To provide a simple, reliable, and user-friendly motor control system suitable for educational and industrial applications.

        The major building blocks of this project are:  

1. Regulated Power supply.
2. PIC Microcontroller.
3. DC Motor with L298driver.
4. LCD display.
5. Resset.
6. Control buttons.
7. Crystal
8. LED indicators.

        Software’s used:  

• PIC-C compiler for Embedded C programming.
• PIC kit 2 programmer for dumping code into Micro controller.
• Express SCH for Circuit design.

        Regulated Power Supply:

                 

Block Diagram:            

video: