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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

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

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

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