4x4 Matrix Keypad Module

4x4 Matrix Keypad Module

The 4×4 Matrix Keypad Module is an input device used in electronic and embedded systems to enter numbers, letters, or commands. It consists of 16 push buttons arranged in a 4-row × 4-column matrix, which reduces the number of microcontroller pins required for operation.

Instead of using 16 separate input pins, the keypad uses only 8 pins (4 rows + 4 columns), and the microcontroller detects key presses by scanning rows and columns.

• Keypad Type: 4×4 matrix push button keypad
• Total Keys: 16 keys
• Layout: 4 rows × 4 columns
• Operating Voltage: 3.3 V to 5 V DC
• Interface Pins: 8 pins (R1, R2, R3, R4, C1, C2, C3, C4)
• Switch Type: Membrane or tactile switch