You have thistk85

Matrix Keypad (I2C)

A 4×4 keypad on two I²C wires instead of eight GPIO pins. The TK85 adapter, the soft and heavy-duty keypads, the two keymaps they need, and how to put two on one bus.

Start here · 01 Sixteen keys, eight wires The reference

Product questions & answers ↓

The whole handbook11 articles · 50 min DatasheetPDF · ti.com Pinout and specsThe pin table, and the questions people ask first

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Matrix Keypad (I2C)

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Need another

Comes in this kit — not sold separately

TinkerBlock 46-Piece Sensor Module Kit

Order or missing parts?

Email us or reply to your order, and quote tk85 — that identifies the product. If something is missing from the bag, your order is the record of what shipped.

Take it with you

Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.