LCD pin descriptions:
The LCD discussed in this section has 14 pins. The function of each pin is given in table.
Vcc, Vss, and VEE:
While Vcc and Vss  provide  +5V and ground, respectively, VEE  is used for controlling LCD contrast.
RS – register select:
There are two very important registers inside the LCD. The RS pin is used [...]

Here is a project called ‘Digital Code Lock using AT89C2051′. LCD is used for display and a keyboard is used to input  the keys. This project source code is written in C. Both the C files and hex files are given for download.
A Brief Description:
This a simple project with efficient hacking prevention from Brute Force [...]

Introduction
Basic idea
Hardware description

Display section
Keyboard, Indicator & Beeper section
Lift & motor section
Sensor section
LCD section

Software program

1.Introduction:
Automatic multistoried car parking system helps to minimize the car parking area. In the modern world, where parking-space has become a very big problem and in the era of miniaturization, it is become a very crucial necessity to avoid the wastage of [...]