Sealed Membrane 4X4 Button Pad with Sticker is amazing by its beautiful construction and easiness in handling. Switches are arranged in awesome colour combinations as shown below. It is widely used in many electronic appliances. It is very simple and is very easy for beginners to hack it. The same keypad designed by press button switches in breadboard will also work. But it will take a lot of time to complete the circuit and error checking will become difficult. Sealed membrane 4*4 button pad can easily connected to arduino using connector socket provided at the bottom.
Since it is a 4 *4 button key pad, it has eight output lines. Output lines are connected to a socket through a flexible sheet. This makes this key pad different. Switches are arranged as a matrix as shown in the following diagram.
K, L, M, N, O, P, Q and R are the eight output lines from the matrix. Corresponding K, L, M, N, O, P, Q and R pins in the output lines from 4*4 button key pad is shown in the following image.
1 controlls the current flow through K and O.
2 controlls the current flow through K and P.
3 controlls the current flow through K and Q.
A controlls the current flow through K and R.
4 controlls the current flow through L and O.
5 controlls the current flow through L and P.
6 controlls the current flow through L and Q.
B controlls the current flow through L and R.
7 controlls the current flow through M and O.
8 controlls the current flow through M and P.
9 controlls the current flow through M and Q.
C controlls the current flow through M and R.
* controlls the current flow through N and O.
0 controlls the current flow through N and P.
# controlls the current flow through N and Q.
D controlls the current flow through N and R.
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