Interfacing
PC Keyboard
Description:
Keyboards and keypads are widely used input devices being used in various
electronics and embedded projects.
They
are used to take inputs in the form of numbers and alphabets and fed the same
into the system for further processing.
4*4
matrix keypad consist of set of push buttons which are interconnected like in
our case 4*4 matrix keypad in which there are 4 push buttons in each of four
rows.
The
terminals of the push buttons are connected according to diagram
Matrix
keypad are commonly used in calculator, telephones etc. which are a number
input switches that are required
Matrix
keypad can be connected to the micro-controller in numerous ways or techniques
but the fundamental logic is some as making the columns as input and rows as
output..
so
in order to detect the key pressed from the keypad the row lines have to be
made low one by one to read the columns.
16
wires arranged in 8 rows and 8 columns can connect 64 keys sufficient for a
full octave of range 61 notes.
Comments
Post a Comment