Interfacing of Matrix Keypad With 8051:

Matrix Keypad:

Matrix Keypads are commonly used in calculators, telephones etc where a number of input switches are required. We know that matrix keypad is made by arranging push button switches in row and columns. In the straight forward way to connect a 4×4 keypad (16 switches) to a microcontroller we need 16 inputs pins. But by connecting switches in the following way we can read the status of each switch using 8 pins of the microcontroller.

Simulation of matrix keypad with 8051 is given in above.

ASM Code of matrix keypad with 8051 :

Simulation of matrix keypad with 8051 is given in above.

C Code of matrix keypad with 8051 :

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