2-Pack 4x4 Matrix Keypad with I2C Adapter for Arduino IDE

$36.09

【8 GPIO PINS DOWN TO 2】 SIX PINS BACK ON EVERY BUILD: A 4x4 matrix keypad wired directly takes eight GPIO pins. Through the adapter it needs two — SDA and SCL. The six pins you get back stay free for displays, SD cards, servos and sensors, and other I2C devices can share the same two wires.

【RIGID HOUSING, INDIVIDUAL KEYS】 BUILT FOR REPEATED PRESSES: Molded ABS frame with 16 separately raised keys on a PCB — 0-9, A-D, star and hash. 160-180g actuation force and under 100 ohm contact resistance give a firm, repeatable press rather than a soft membrane feel.

【NO JUMPER WIRES BETWEEN THEM】 FACTORY PRE-SOLDERED HEADER: The 8-pin header arrives already soldered to the keypad and plugs straight into the adapter socket. Four wires — GND, VCC, SDA, SCL — go to your board. Runs on or 5V logic, so no level shifter is needed.

【TWO IN THE PACK】 ONE TO BUILD WITH, ONE IN RESERVE: Two complete keypad-and-adapter pairs, so a second project or a spare is already covered. Both adapters ship at 0x20 and work independently on separate boards straight away.

【OPTIONAL: BOTH ON ONE BUS】 A0/A1/A2 PADS: To run both keypads on a single board, bridge the A0 solder pad on one adapter to move it to 0x21. This step needs a soldering iron. The pads cover eight es, 0x20 to 0x27. Compatible with Arduino IDE, ESP32-S3 and Raspberry Pi boards; the open-source I2CKeyPad library is in the Arduino Library Manager.

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2-Pack 4x4 Matrix Keypad with I2C Adapter for Arduino IDE

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