Keypad security with 8051 Microcontroller

This project interfaces famous Microcontroller AT89C51 with LCD 16×2 with 3×4 Keypad. This project asks the user to enter password to unlock the lock or light up the LED. Password security via keypad can be very productive you can just put a security lock outside your door and use a servo motor to unlock the door if the user enters a correct password. However, in this project we use a simple LED if the user enters a correct password LED will glow else not. To see how to interface a simple keypad with LCD using AT89C51 please visit here....

Scroll text on DOT Matrix 16×8 display using 8051 Microcontroller AT89C51

A dot-matrix display is a display device used to display information on machines, clocks, railway departure indicators and many other devices requiring a simple display device of limited resolution. The display consists of a dot matrix of lights or mechanical indicators arranged in a rectangular configuration (other shapes are also possible, although not common) such that by switching on or off selected lights, text or graphics can be displayed. A dot matrix controller converts instructions from a processor into signals which turns on or off lights in the matrix so that the required display is produced. A dot Matrix...

Display HELLO! on 16×2 LCD using AT89C51

LCD Interfacing with AT89C51 LCD Interfacing with AT89C51 is very common, and usually applied in every engineering project with AT89C51. So, to interface LCD lets look at some basics: A 16×2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5×7 pixel matrix. See Pin Configuration: This LCD has two registers. Command/Instruction Register – stores the command instructions given to the LCD. A command is an instruction given to LCD to do a predefined task like initializing, clearing the screen, setting the cursor position, controlling...