A garage door opener is a motorized device that opens and closes garage doors. Most are controlled by switches on the garage wall, as well as by remote controls carried in the garage owner's cars, or more rarely, on key chains.

The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage

The first wireless garage door openers were invented and developed by two US inventors at the same time unknown to each other, one in Illinois and the other in Washington state.

The first garage door opener remote controls were simple and consisted of a simple transmitter (the remote) and receiver which controlled the opener mechanism. The transmitter would transmit on a designated frequency; the receiver would listen for the radio signal, then open or close the garage, depending on the door position. While novel at the time, the technology ran its course when garage door openers became widely available and used. Then, not only did a person open their garage door, they opened their neighbor’s garage door as well. While the garage door remote is low in power and in range, it was powerful enough to interfere with other receivers in the area.

The second stage of the wireless garage door opener system dealt with the shared frequency problem. To rectify this, multicode systems were developed.

Here we will be developing a multicode system with a combination of more than 4000 codes.

Block Diagram:

Figure shows the block diagram of system.

Each vehicle will be fitted with a transmitter section. So whenever your vehicle is started it will start transmitting a specific code. So when this code is picked up by the receiver circuit it will decode the received data and accordingly open the gate. If the code is not received for a period of say 30 seconds the door will be closed automatically.

Advantages:

1. Ease of use is at an all-time high when you choose automatic garage door openers as a simple touch of button will allow you access to your garage without having to set foot outside the vehicle; perfect for rainy days.
2. Automatic garage doors do not need any added maintenance when compared to manual alternatives
3. Ease of Life

Disadvantages:

1. Cannot work without Power.
2. Installment cost is high.

Future Scope:

1. Automatic courtesy lights that turn on when the door opens and automatically turn off after a preset time delay
2. A remote lockout feature, which turns off the radio receiver while one is on vacation or away for an extended time.
3. The availability of accessories has increased, including such features as wireless keypads, key chain remotes, and solenoid-operated deadbolts to lock the door itself.
4. An integrated carbon monoxide sensor to open the door in case of the garage being flooded with exhaust fumes
5. Door activation over the Internet to allow home owners to open their garage door from their office for deliveries.

Text Books:

1. Muhammad Ali Mazidi –“THE 8051 MICROCONTROLLER AND EMBEDDED SYSTEMS”, Pearson education,
2. Ayala- “INTRODUCTION TO 8051 MICROCONTROLLER”

Website:

1. www.howstuffworks.com
2. www.instructables.com/id/Cellphone-operated-Robot/
3. www.dnatechindia.com
4. www.answers.com

Magazines:

1. Electronics for you
2. Electrikindia