Usb pic18f4550 :: 4x4 matrix keys circuit

Matrix keys

Keypads are a part of HMI or Human Machine Interface and play really important role in a small embedded system where human interaction or human input is needed. Martix keypads are well known for their simple architecture and ease of interfacing with any microcontroller.

The Hardware connection of these switch are shown in below :

LED circuit

anonymous   said:
6 years ago


I want 4x4 keypad program. Please give it to me.

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