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Well this is one of the most interesting and long awaited project uploaded on any microcontroller website. Its an Inverter/UPS with inbuilt charging system based on 8051 (AT89C2051) with a rating of 3000VA. As you all know an inverter converts DC voltage to AC, This project uses 24V DC battery and convert it to 220v 50Hz AC. Here are some pictures of constructed hardware.





The inverter system is divided into six sections:
  1. Inverter
  2. Charger
  3. Multivibrator
  4. Powerpack
  5. Sensors and Indicators
  6. Automatic changeover


8051 controller plays its major role in "Sensors and Indicators" section. 8051 is used to monitor the voltages and indicate status through LEDs. You can also find UPS test design for Proteus VSM simulator, to stimulate the design in case of any doubt. It is the same controller circuit as given in pdf. At89c2051 uses an active low to perform its operation from lm393 voltage comparator that's why a push button is connected to ground to test the circuit.

You can find pictures, code and small documenation that explains the working and block diagram of this project. Incase you have any doubts, feel free to post on our forum at www.8051projects.net/forum.html

I would link to thank Victor (ugoo5000) for sharing his great project again with us. Also I want to apologize for delay in uploading this project I should have done it earlier. Thanks Victor for great contribution to this webiste.

Visit following link to download this project:
8051 based Inverter/UPS with inbuilt Charging system
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This Project "Automatic Room Light Controller with Visitor Counter using Microcontroller" is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/visitors in the room very accurately. When somebody enters into the room then the counter is incremented by one and the light in the room will be switched ON and when any one leaves the room then the counter is decremented by one. The light will be only switched OFF until all the persons in the room go out. The total number of persons inside the room is also displayed on the seven segment displays.

The microcontroller does the above job. It receives the signals from the sensors, and this signal is operated under the control of software which is stored in ROM. Microcontroller continuously monitor the IR Sensors, When any object pass through the 555 timer generates a pulse and interrupt controller. So visitors in the room are counted up by Sensor1 and Sensor2 counts visitors going out of room. As soon as visitor count reaches 0 the room light turns off.

We already had this project in our download section but Anudeep (bobdxcool) had made it working. Thank you so much for sharing this project back.

Here is a working video of project shared by Anudeep:


You can download this project here:
Automatic Room light Controller with Visitor Counter
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Football/Soccer Substitution Board

We all build projects, we never think if those projects will be used in real life or not. But this time Victor (ugoo5000) Brings a very simple but very useful idea to the table that can become reality to anyone, who needs it. If you're a Football/soccer fan and you have a home team, Then this is a must do project for you.



This project is a really simple Football/Soccer substitution board used on field. As seen from the picture above its a very professional looking substitution board. Board has two color LED display each counts from 00 to 99 with Red and Green color display. Using this board is really simple, Just select number and show it as simple as that.

Project code is written in assembly language very easy to understand, No complex glue logic. You can ask your doubts on forum if you have any. Our Admins, moderators are always available on forum to answer you. So go ahead and make this enjoyable project at home or for your school.

Download this project from here:
Football/Soccer Substitution Board
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Here is another great submission from Victor (ugoo5000). We do have many digital clock projects on website but I again wanted to add this one to our list because there are two new and interesting things in it. There are good things to learn from this project. So I summarize all of them here:

  1. DS1302 as Time keeping IC
  2. Interrupt based keypad


The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. DS1302 communicates with microcontroller using a 3 wire interface a very similar to SPI. So this is one new thing to learn in this project.

Now second interesting thing which got my attention is interrupt based keypad. All codes we have seen till now uses keypad scanning. This one uses interrupt based approach for scanning keys. As soon as a key an interrupt is generated though an AND gate connected to all the rows, which indicate controller that a key is pressed. So scanning is done in ISR routine where key is detected. I am sure this way of using a keypad must be helpful fo many of us when making our new projects.

You can download this project from link below
DS1302 based Digital Clock with Calendar
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Conversation

Sun Oct 13 2019, 03:02 AM
Aline Hutchinson
Hey there,
ExperimenterUK
Sat Oct 12 2019, 11:23 PM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 11:18 AM
Bhadra Sajikumar
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, 08:37 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, 09:48 PM
Caryn Kover
Thank you for your time,
ExperimenterUK
Mon Aug 05 2019, 08:09 PM
@Ismail ..post in forum, give details
Mon Aug 05 2019, 05:33 PM
Ismail balghmi
Hello. Please I won't download
ExperimenterUK
Wed Jul 24 2019, 01:47 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 07:13 PM
BUSTER123
hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
ExperimenterUK
Thu Jul 11 2019, 08:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html

Downloads

Comments

ilylily07
Tue Oct 15 2019, 04:32 PM
hientran123
Tue Oct 15 2019, 02:27 AM
Sat Oct 05 2019, 02:38 PM
zexalo
Thu Oct 03 2019, 09:53 AM
thanhle12345
Thu Oct 03 2019, 07:37 AM
ramon_vsc
Fri Sep 20 2019, 04:53 PM
youssoufba
Thu Sep 19 2019, 11:57 AM
Taiphan000
Tue Sep 17 2019, 04:21 AM

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Forum Activity
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Thu Oct 17 2019, 09:38 PM
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Oct 17 2019, 08:35 PM
Do you understand how this code works?If so, addin...
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Thu Oct 17 2019, 09:30 AM
i want to scroll message more than 2 dot matrix di...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Oct 16 2019, 09:58 PM
What do you mean by "message scroll vertically" ?...
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Wed Oct 16 2019, 07:38 AM
s_dinesh40@yahoo.com Avatar
Posted By [email protected]
Wed Oct 16 2019, 07:13 AM
message scroll vertically, please share code.
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Oct 16 2019, 01:10 AM
Which camera ?What do you want the micro to do ?
ilylily07 Avatar
Posted By ilylily07
Tue Oct 15 2019, 04:43 PM
i need help.i don't know how to do it.is it possib...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sun Oct 13 2019, 06:10 PM
This code does some scrolling.You will need to fin...
ExperimenterUK Avatar
Posted By ExperimenterUK
Sat Oct 12 2019, 10:19 PM
This code does not scroll, that will be complicate...