Tishitu's video: Pulse Width Modulation PWM for Motor Speed

Tishitu explains Pulse width Modulation or PWM is one of the powerful techniques used in control systems today. They are not only employed in wide range of control application which includes: speed control, power control, measurement and communication. This tutorial will take you through the PWM basics and implementation of PWM on 8051 Pulse-width Modulation is achived with the help of a square wave whose duty cycle is changed to get a varying voltage output as a result of average value of waveform PWM or Pulse Width Modulation is an important and essential concept in embedded systems. We can control speed of a motor, brightness of a bulb or a LED or oscilloscope etc by supplying a train of pulses. If the pulse has larger ON time i.e. duty cycle, the average voltage supplied will be more, thus if we have connected a motor to the output, its speed increases, if we reduce the pulse width, average voltage supplied is less, thus the speed of the motor decreases. Thus we can digitally control the speed of a motor or oscilloscope So now we will construct a pulse width modulator using 8051(89s52) to illustrate the concept of PWM I have constructed a simple circuit which is shown below, where a MOTOR or small lamp is connected to the output of microcontroller (you can also connect a small motor or fan with an additional transistor). The microcontroller is programmed such that the speed of the MOTOR or oscilloscope increases for some time, when it reaches maximum speed, the MOTOR or oscilloscope speed starts to slow till its speed is minimum and this continues. TISHITU ISO: 9001-2008 RESEARCH AND CONSULTANCY CELL OF INDUSTRIAL APPLICATION Copyright © All Rights Reserved www.tishitu.net tishitu@gmail.com, tishitu@tishitu.net Reg No.08122629691/SSI -~-~~-~~~-~~-~- Please watch: "Lifi Communication by Arduino UNO Download Project" https://www.youtube.com/watch?v=c4gC8dbaiZg -~-~~-~~~-~~-~-