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