We all are familiar with the LCDs (Liquid Crystal Display) that used to display the contents using the combination of characters. 16×2 LCD have 16 columns and 2 rows.
Working of 16×2 LCD and its interfacing with 8051 Microcontroller
Working of Keypad and its interfacing with 8051 microcontroller
Keypad is the combination of buttons which is used for more options using less number of pins (wires). Such keypads are used in mobiles for typing SMS or dialing number.
In all of above keypads you have seen there, number of buttons are greater than the number of pins. Read More
Door Security Lock with Keypad
Security is important everywhere. To secure things using the digits, keypads are used to take the input from the user. For this purpose, components that you need are:
Microcontroller: At89c51
Keypad: cellular phone keypad (4×3)
