This project shows how 16 keys are multiplexed by 4x4 matrix way i.e no of rows: 4 & no of columns: 4 & interfaced with an AVR mcu.
Atmega8 is used here along with a character LCD to show the pressed key value of the matrix keypad.
- Scienceprog.com 's LCD library is used
ckt & codes are here : https://drive.google.com/file/d/0B8PCKc-8AIcDYjJ5ZjNNcVVQR2M/edit?usp=sharing
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