The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of in-system programmable Flash memory. The device is manufactur. AT89S51 is low power high performance microcontroller from atmel,AT89S51 buy online India. Let’s just call the 89C51 the vanilla , and from now on will be refered as vanilla. The 89S51/2 has a Flash memory and an ISP or In System.

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LCD based digital alarm clock using 89S51 microcontroller.

LCD based digital alarm clock using 89S51 microcontroller

Circuit Diagram 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 link in a security chain. The microcontroller based digital lock for Doors is an access control system that allows only authorized persons to access a restricted area.


An electronic lock or digital lock is a device which has an electronic control assembly attached to it. They are provided with an access control system.

This system allows the user to unlock the device with a password. The password is entered by making use of a keypad.

ATMEL 89C51 | AT89C51 Microcontroller Pin Diagram & Description

The user can also set his password to ensure better protection. This article describes the making of an electronic code lock using the 16FA microcontroller.

The system is fully controlled by the 8 bit microcontroller 16FA mjcrocontroller has a 8Kbytes of ROM for the program memory. First, a quick history of RS It’s just a name for a standard that has propagated from generation to generation of computers. The first computers had serial ports that used RS, and even current computers have serial ports or at least USB ports that act like RS ports.

Back microcomtroller the day, serial information needed to be passed from devices like printers, joysticks, scanners, etc to the computer.


The simplest way to do this was to pass a series of 1s and 0s to the computer. Both the computer and the device agreed on a speed of information – ‘bits per second’.

As long as the computer output bits at the pre-determined speed, the printer could listen. Zoom forward to today. Electronics have changed a bit. Before they were relatively high power, high ….