Warranty and returns
12-month warranty on everything we sell. If a part is faulty, we'll replace or refund it and cover the return postage. Damage from soldering, wiring mistakes or modification isn't covered.
Changed your mind? Return it unused within 30 days for a full refund, with no restocking fee.
Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. Full returns policy
Shipping
Free standard shipping within Australia on orders over A$55. Under A$55, standard shipping is A$6.95.
New Zealand A$8.99. Rest of the world A$14.95, flat rate.
Orders ship from Macquarie Park, NSW within one business day of payment when the item is in stock. Shipping policy
Description
A heavy-duty 16-key keypad with an I2C adapter that cuts its wiring from eight GPIO pins to two. Two complete sets in the pack.
Highlights
- Eight pins down to two. The adapter reads the keypad over SDA and SCL, and other I2C devices can share the same wires.
- Rigid keypad. Moulded ABS frame with 16 raised keys: 0–9, A–D, * and #.
- Plug together. The 8-pin header is soldered to the keypad at the factory and plugs into the adapter socket.
- 3.3V or 5V. Runs at your board's logic voltage, no level shifter needed.
- Both on one bus. Adapters ship at 0x20; bridge the A0 pad on one (soldering required) to move it to 0x21. The pads cover 0x20–0x27.
In the box
- 2 × heavy-duty 4x4 keypad, 8-pin header soldered on
- 2 × I2C adapter with an 8-way socket
Specifications
- Keys: 16 (4 × 4)
- Actuation force: 160–180g
- Contact resistance: under 100Ω
- Supply: 3.3V or 5V
- I2C address: 0x20 as shipped, 0x20–0x27 by pads
Works with
Any board with I2C in the Arduino IDE, including the ESP32-S3. The open-source I2CKeyPad library is in the Arduino Library Manager.
Questions
4x4 Matrix Keypad with I2C Adapter, 2-Pack
- Ships worldwide
- 30-day returns
- 12-month warranty
What's in the box
parts, each with its own handbook
Tap any part for its wiring, example code for Arduino and MicroPython, and a 3D model you can turn over.
Stuck? Ask the people who made it
Email office@lonelybinary.com with your setup and what it is doing. Our product team answers within 24 hours.
