4x3 Membrane keypad plus encoder board for analog output - Assembled
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Professional quality 4x3 matrix membrane keyboard with assembled analog output (One-Wire output) allows you to connect it to your Arduino using only 1 analog input. The 12 keys are encoded as different voltage values on the output pin.
Normally you would need 7 pins to connect to a 4x3 keyboard. Since this keyboard generates a unique analog value for each key it only requires one analog input leaving the other 6 I/O pins on your Arduino free for your project. Also, it is much easier and decorative to use a regular phone cable to connect to this keyboard than using 7 conductor cable.
The 12 keypads go through a series of resistors of the same value that allow this keyboard to generate a unique analog voltage for each key. The voltage values have good separation so they don't overlap.
The back of the keyboard has a self-adhesive coating so you can fix it on a flat surface.
Also available as a kit. Please consult the catalog.