19-04-2011, 09:52 AM
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DIGITAL LOCK CODE USING 8051
ABSTRACT
Security is a prime concern in our day-today life. Everyone wants to be as much secure as possible. An access control for doors forms a vital page link in a security chain. The microcontroller based Door locker is an access control system that allows only authorized persons to access a restricted area. The system is fully controlled by the 8 bit microcontroller AT89C2051 which has a 2Kbytes of ROM for the program memory. The password is stored in the EPROM so that we can change it at any time.
The system has a Keypad by which the password can be entered through it. When the entered password equals with the password stored in the memory then the relay gets on and so that the door is opened. If we entered a wrong password for more than three times then the Alarm is switched on.
When we go inside and come back then the microcontroller will sense the person using the Laser light, the microcontroller will automatically open the door for you.
1. INTRODUCTION
“Password Based Door Security System using Microcontroller” is used in the places where we need more security. It can also used to secure lockers and other protective doors. The system comprises a number keypad and the keypads are connected to the 8 bit microcontroller AT89C2051. This is one of the popular Microcontroller. It has only 20 pins and there are 15 input/output lines. The microcontroller has a program memory of 2 Kilobytes. The microcontroller continuously monitor the keypad and if somebody enters the password it will check the entered password with the password which was stored in the memory and if it they are same then the microcontroller will switch on the corresponding device. The system will allow the person who knows the password and it will not allow who don’t know the password and the system will also show the persons who try to break the protection barrier.
CHAPTER-2
PROJECT DESCRIPTION
2. PROJECT DESCRIPTION
2.1 BLOCK DIAGRAM
2.2 BLOCK DIAGRAM EXPLANATION
INTEL’S 8051 Architencture
The generic 8051 architecture sports a Harvard architecture, which contains two separate buses for both program and data. So, it has two distinctive memory spaces of 64K X 8 size for both program and data. It is based on an 8 bit central processing unit with an 8 bit Accumulator and another 8 bit B register as main processing blocks. Other portions of the architecture include few 8 bit and 16 bit registers and 8 bit memory locations. Each 8051 device has some amount of data RAM built in the device for internal processing. This area is used for stack operations and temporary storage of data. This base architecture is supported with onchip peripheral functions like I/O ports, timers/counters, versatile serial communication port. So it is clear that this 8051 architecture was designed to cater many real time embedded needs.
The following list gives the features of the 8051 architecture:
Optimized 8 bit CPU for control applications.
Extensive Boolean processing capabilities.
64K Program Memory address space.
64K Data Memory address space.
128 bytes of onchip Data Memory.
32 Bi directional and individually addressable I/O lines.
Two 16 bit timer/counters.
Full Duplex UART.
6 source / 5 vector interrupt structure with priority levels.
Onchip clock oscillator.
Now you may be wondering about the non mentioning of memory space meant for the program storage, the most important part of any embedded controller. Originally this 8051 architecture was introduced with onchip, `one time programmable' version of Program Memory of size 4K X 8. Intel delivered all these microcontrollers (8051) with user's program fused inside the device. The memory portion was mapped at the lower end of the Program Memory area. But, after getting devices, customers couldn't change any thing in their program code, which was already made available inside during device fabrication.
So, very soon Intel introduced the 8051 devices with re programmable type of Program Memory using built in EPROM of size 4K X 8. Like a regular EPROM, this memory can be re programmed many times. Later on Intel started manufacturing these 8051 devices without any on chip Program Memory.
DIGITAL LOCK CODE USING 8051
ABSTRACT
Security is a prime concern in our day-today life. Everyone wants to be as much secure as possible. An access control for doors forms a vital page link in a security chain. The microcontroller based Door locker is an access control system that allows only authorized persons to access a restricted area. The system is fully controlled by the 8 bit microcontroller AT89C2051 which has a 2Kbytes of ROM for the program memory. The password is stored in the EPROM so that we can change it at any time.
The system has a Keypad by which the password can be entered through it. When the entered password equals with the password stored in the memory then the relay gets on and so that the door is opened. If we entered a wrong password for more than three times then the Alarm is switched on.
When we go inside and come back then the microcontroller will sense the person using the Laser light, the microcontroller will automatically open the door for you.
1. INTRODUCTION
“Password Based Door Security System using Microcontroller” is used in the places where we need more security. It can also used to secure lockers and other protective doors. The system comprises a number keypad and the keypads are connected to the 8 bit microcontroller AT89C2051. This is one of the popular Microcontroller. It has only 20 pins and there are 15 input/output lines. The microcontroller has a program memory of 2 Kilobytes. The microcontroller continuously monitor the keypad and if somebody enters the password it will check the entered password with the password which was stored in the memory and if it they are same then the microcontroller will switch on the corresponding device. The system will allow the person who knows the password and it will not allow who don’t know the password and the system will also show the persons who try to break the protection barrier.
CHAPTER-2
PROJECT DESCRIPTION
2. PROJECT DESCRIPTION
2.1 BLOCK DIAGRAM
2.2 BLOCK DIAGRAM EXPLANATION
INTEL’S 8051 Architencture
The generic 8051 architecture sports a Harvard architecture, which contains two separate buses for both program and data. So, it has two distinctive memory spaces of 64K X 8 size for both program and data. It is based on an 8 bit central processing unit with an 8 bit Accumulator and another 8 bit B register as main processing blocks. Other portions of the architecture include few 8 bit and 16 bit registers and 8 bit memory locations. Each 8051 device has some amount of data RAM built in the device for internal processing. This area is used for stack operations and temporary storage of data. This base architecture is supported with onchip peripheral functions like I/O ports, timers/counters, versatile serial communication port. So it is clear that this 8051 architecture was designed to cater many real time embedded needs.
The following list gives the features of the 8051 architecture:
Optimized 8 bit CPU for control applications.
Extensive Boolean processing capabilities.
64K Program Memory address space.
64K Data Memory address space.
128 bytes of onchip Data Memory.
32 Bi directional and individually addressable I/O lines.
Two 16 bit timer/counters.
Full Duplex UART.
6 source / 5 vector interrupt structure with priority levels.
Onchip clock oscillator.
Now you may be wondering about the non mentioning of memory space meant for the program storage, the most important part of any embedded controller. Originally this 8051 architecture was introduced with onchip, `one time programmable' version of Program Memory of size 4K X 8. Intel delivered all these microcontrollers (8051) with user's program fused inside the device. The memory portion was mapped at the lower end of the Program Memory area. But, after getting devices, customers couldn't change any thing in their program code, which was already made available inside during device fabrication.
So, very soon Intel introduced the 8051 devices with re programmable type of Program Memory using built in EPROM of size 4K X 8. Like a regular EPROM, this memory can be re programmed many times. Later on Intel started manufacturing these 8051 devices without any on chip Program Memory.
