As you see keypad everywhere like in mobile, in land line telephones, in your computer or in laptops etc. places.
Here we learn to make 4x4 Matrix Keypad.
Concept :-
Concept is very simple. We arrange 16 push buttons in the form of 4x4 matrix. One of Rows or Columns are connected from resistance of 1k ohm and they are connected from ground or VCC. If you connected them from ground then keypad is works on 0 logic and if you are connected them from VCC then keypad is works on 1 logic. 8 output pins are draw from 4 rows and 4 columns as shown in fig. below :-
Images :-
Here we learn to make 4x4 Matrix Keypad.
Concept :-
Concept is very simple. We arrange 16 push buttons in the form of 4x4 matrix. One of Rows or Columns are connected from resistance of 1k ohm and they are connected from ground or VCC. If you connected them from ground then keypad is works on 0 logic and if you are connected them from VCC then keypad is works on 1 logic. 8 output pins are draw from 4 rows and 4 columns as shown in fig. below :-
Output is in the form of binary digits. When you press one button of keypad then 2 output pin become high.
List of outputs :-
Circuit :-
List of components :-
- push button(4 leg) - 16
- 5V battery - 1
- male connector
- 1k ohm resistance - 1
Pcb layout :-
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| bottom view |
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| top view |
Note :-
Here we use 0 logic.
Images :-
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| top view |
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| bottom view |
JUST ENJOY YOUR PROJECT
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