This Matrix Keypad 4 X 3 has 12 buttons, arranged in a telephone-line 3×4 grid. The keys are connected into a matrix,hence only 7 microcontroller pins (3-columns and 4-rows) are required to scan the pad.
Specifications of Matrix Keypad 4 X 3:
- Can be attached on any surface
- Only 7 microcontroller pins are needed to access 12 buttons
- Size: 70mm x 77mm x 1mm
- Weight: 7.5gm