Hey friends this is my 3rd year BE project ” Speed control of DC motor“which i could like to share with you .In this you will learn how to interface LCD,hex keypad and motor .The code is written in assembly
to simplify I have first explained separately LCD interfacing hex keypad interfacing ,motor interfacing with L293D
so Lets get Started !!!
Step 1: Materials Required
*89S52
*LCD
*Hex keypad
*DC motor
I assume u have basic knowledge of 8051 programming in assembly
Step 2: Interfacing DC Motor -L293D
L293D is a dual H-Bridge motor driver, So with one IC we can interface two DC motors which can be controlled in both clockwise and counter clockwise direction we can control speed of each dc motor by giving PWM to enable pin .L293D has output current of 600mA and peak output current of 1.2A per channel. Moreover for protection of circuit from back EMF ouput diodes are included within the IC. The output supply (VCC2) has a wide range from 4.5V to 36V, which has made L293D a best choice for DC motor driver.
As you can see in the circuit, three pins are needed for interfacing a DC motor (A, B, Enable). If you want to control speed enable pin is connetcted to the PWM pin of microcontroller . I have connected only one motor and used the enable pin to contol the speed of dc motor.
Source: gsm based dc motor speed control using pic microcontroller
About The Author
Ibrar Ayyub
I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.
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