16-Key Push Button Module

DESCRIPTION

The 16-Key Push Button Module is a 4x4 matrix keypad built from sixteen tactile push buttons on a single PCB, giving your Arduino, ESP32 or Raspberry Pi project a compact numeric or function keypad. It is a popular choice for makers, students and school STEM labs building PIN-entry locks, menu controls and interactive games.

Because the buttons are wired as a row-and-column matrix, all 16 keys are read using just 8 GPIO pins, and the passive design works with both 3.3V and 5V logic boards.

FEATURES

• 16 tactile push buttons arranged in a 4x4 matrix (labelled S1 to S16)
• Row/column matrix wiring reads all 16 keys with only 8 GPIO pins
• 8-pin male header labelled R1–R4 and C1–C4 for straightforward wiring
• Passive design with no onboard ICs — compatible with 3.3V and 5V microcontrollers
• Firm, clicky 6x6mm tactile switches for reliable key presses
• Works with the standard Arduino Keypad library and similar matrix-scanning code

APPLICATIONS

• PIN-code door locks and security access panels
• Menu navigation and parameter entry for embedded projects
• Calculators, counters and numeric input devices
• Game controllers and interactive classroom STEM projects
• Control panels for robots, IoT devices and home automation

TECHNICAL DETAILS

• Number of Keys: 16 (4x4 matrix)
• Switch Type: Tactile push button, 6x6mm
• Interface: 8-pin matrix (4 rows, 4 columns)
• Pin Labels: C4, C3, C2, C1, R1, R2, R3, R4
• Header Pitch: 2.54mm
• Logic Compatibility: 3.3V / 5V

SHIPPING LIST

• 1x 16-Key Push Button Module