Introduction - If you have any usage issues, please Google them yourself
Matrix keyboard, also known as the determinant keyboard, it is used
4
article
The I/O
Line as the line,
4
article
The I/O
Line as column line consisting of a keyboard. in
Lines to rows and columns of each intersection, set a button. The number of keys in this keyboard is
4
x
4
A. The determinant keyboard
Structure can effectively improve the microcontroller in the system
The I/O
The utilization rate of the mouth.