PROJECTS FOR YOU

Saturday, 27 October 2012

4x4 MATRIX KEYPAD

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 :-

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 :-

bottom view

top view

Note :-

Here we use 0 logic.

Images :-

top view

bottom view

JUST ENJOY YOUR PROJECT

IF YOU HAVE ANY QUERY THAN CONTACT US OR GIVE YOUR QUERY IN THE QUERY OPTION.

GOOD LUCK
More embedded projects >>.... More MAT LAB projects>>...

Thursday, 25 October 2012

KNIGHT RIDER LIGHTS

Guys while driving you had seen some lights on the road. They are blinking in a fixed pattern like they are also riding with you. These lights mostly placed at the middle or at the divider side of the road. These lights are called KNIGHT RIDER LIGHTS.

Concept :-
Concept of Knight Rider Lights are very similar to the concept of TRAFFIC LIGHT or ELECTRONIC DICE . Only combination of diodes are changed.

4017 counter and 555 timer :-