4*3 Membrane Switch Matrix Keypad

The 4*3 Membrane Switch Matrix Keypad is a thin, flexible keypad with 12 keys laid out in 4 rows and 3 columns: the digits 0 to 9 plus * and #. The keys are wired as a matrix, so all 12 can be read with only 7 microcontroller pins through a flat ribbon cable. It is a popular input for Arduino door locks, password systems, calculators and menu control.

4*3 Membrane Switch Matrix Keypad Specifications

• Keys: 12 (1–9, *, 0, #)
• Layout: matrix of 4 rows × 3 columns
• Connection: flat ribbon cable with a 7-pin, 2.54 mm connector (4 rows + 3 columns)
• Type: membrane switch, thin and flexible
• Works with: Arduino, ESP32 and Raspberry Pi

4*3 Membrane Switch Matrix Keypad Applications

• Password door locks with a servo, relay or solenoid
• Security and alarm system keypads
• Numeric entry and menu navigation with an LCD
• Calculators, timers and counters
• Electronics classes and STEM projects

What's in the Box

• 1 × 4×3 (12-key) membrane matrix keypad

Tip: Use the Arduino Keypad library and connect the 7 pins to 7 digital pins; the library scans the rows and columns for you. Pin order varies between keypads, so if keys read wrong, find the row and column pins with a multimeter in continuity mode.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.