### Pulse Width Modulation Tutorial

Pulse Width Modulation tutorial

Introduction to PWM
The theory behind pulse width modulation
and its working.

8051 PWM Example
Implementation of PWM on normal 8051
using timers, along with sample code.

AVR PWM Example
Using timers of AT90S8515 in 8-bit PWM
mode with non-inverting o/p, with sample code.

Posted on Mon Feb 18 2008, 08:55 PM

### An 8051 Based Temperature Controlled Fan project

PWM is Pulse width modulation.. it helps you to control the output voltage by varying the width of a square wave pulse..

A Brief Description:

```|¯¯|__|¯¯|__|¯¯|__ --->
A square wave

|¯¯¯¯¯¯|______
<-Ton->
<-Tof->
.
<---Ttotal--->
```

Ttotal = ton+toff

Duty cycle d = Ton/Ttotal

if Vin is the input voltage and Vo is the o/p voltage.. then

Vo = d x Vin
where d is the duty cycle..
now if we ... Read Compelte post
Other Tags:
Posted by ajay_bhargav on Mon Aug 20 2007, 12:45 PM

### An 8051 Based Temperature Controlled Fan project

I think there is some problem with the attachment of file.. i need to check that..
By the time.. please try to paste the code..

here is a sample PWM code.. check it..
Other Tags:
Posted by ajay_bhargav on Thu Aug 30 2007, 01:05 PM

#### Conversation

Tue Jan 21 2020, 07:25 PM
Hector Tran
Jake
Tue Jan 14 2020, 07:08 AM
when i am trying to simulate the program in Proteus 8 professional, I am getting some errors as cannot find module file dhtxx.md can u help me
Tue Dec 17 2019, 01:44 PM
Devangi
hello..i am programming industrial timer using 8051 with 24lc64 eeprom. i have query in storing the 3 diff value in eeprom with enter button. can anyone share c code ?
Tue Dec 17 2019, 10:30 AM
Andrius
Hello. Can anyone share the code in Bascon and scheme in Proteus?
Thu Nov 21 2019, 12:30 PM
raj2555
how to interface 8051 microcontroller with NRF24L01+ module
Sat Oct 12 2019, 10:23 PM
Sat Oct 12 2019, 10:18 AM
i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
Mon Sep 23 2019, 07:37 AM
Nathaniel
I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
Wed Sep 18 2019, 08:48 PM
Caryn Kover
Mon Aug 05 2019, 07:09 PM
@Ismail ..post in forum, give details

### Recent

Nippy56
Sun Jan 19 2020, 02:13 AM
usb5962
Sat Jan 11 2020, 10:42 AM
elt
Tue Jan 07 2020, 06:53 PM
mg3914697
Tue Jan 07 2020, 12:42 PM
afds43
Sun Dec 29 2019, 05:54 AM
Rupeshpatil
Fri Dec 27 2019, 06:14 PM
pyxus
Sat Dec 14 2019, 12:31 PM
Istika
Thu Dec 12 2019, 12:04 PM

#### Online

Guests: 40, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 38116
Forum Activity
##### Posted By ExperimenterUK
Fri Jan 17 2020, 10:24 PM
We will need the circuit diagram.A Proteus simulat...
##### Posted By Billz
Sat Jan 11 2020, 05:43 PM
hi everyone please attached files are my c code fo...
##### Posted By ExperimenterUK
Tue Jan 07 2020, 08:18 PM
Not a stupid question.Setting up "Eclipse" can be...
##### Posted By elt
Tue Jan 07 2020, 07:06 PM
So i have just began learning programming micros a...
##### Posted By Billz
Mon Jan 06 2020, 09:22 PM
I think it would be better if you guys try to come...
##### Posted By ExperimenterUK
Mon Jan 06 2020, 12:22 AM
Can you post a circuit diagram and any code you ha...
##### Posted By Billz
Sun Jan 05 2020, 08:17 PM
Need help regarding C code (specifically for PIC 1...
##### Posted By ExperimenterUK
Mon Dec 30 2019, 06:42 PM
Can you give more details of your problem.
##### Posted By Rupeshpatil
Fri Dec 27 2019, 06:21 PM
How to copy program my old microcontroller to new ...
##### Posted By ilylily07
Thu Dec 12 2019, 02:26 PM