--- product_id: 45444265 title: "Keypad Shield with 16-Button Matrix Keypad for Arduino" brand: "lectrobox" price: "13 kr" currency: DKK in_stock: true reviews_count: 6 url: https://www.desertcart.dk/products/45444265-keypad-shield-with-16-button-matrix-keypad-for-arduino store_origin: DK region: Denmark --- # Compact dimensions Easy plug-in setup Efficient pin usage Keypad Shield with 16-Button Matrix Keypad for Arduino **Brand:** lectrobox **Price:** 13 kr **Availability:** βœ… In Stock ## Summary > πŸ”‘ Unlock Your Creativity with Every Keypress! ## Quick Answers - **What is this?** Keypad Shield with 16-Button Matrix Keypad for Arduino by lectrobox - **How much does it cost?** 13 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/45444265-keypad-shield-with-16-button-matrix-keypad-for-arduino) ## Best For - lectrobox enthusiasts ## Why This Product - Trusted lectrobox brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Stackable Design:** Easily add more shields or access other pinouts for expanded functionality. - β€’ **Maximized Efficiency:** Only uses 2 pins, freeing up your Arduino for other tasks. - β€’ **Reliable Performance:** Never miss a keypress, thanks to the onboard ATTiny processor. - β€’ **Seamless Integration:** Effortlessly add a keypad to your Arduino projects with just a plug-in! - β€’ **Remote Mounting Flexibility:** Utilize RJ45 adapters for versatile remote installations. ## Overview The Keypad Shield with 16-Button Matrix Keypad for Arduino by Lectrobox is a versatile and efficient solution for integrating keypads into your projects. With a simple plug-in setup, remote mounting options, and minimal pin usage, this shield ensures reliable performance and easy expansion for all your Arduino needs. ## Description ## Features - Quickly and easily add a keypad to your Arduino project. Just plug it in, link the included Arduino library, and call getNextKeypress() to get each keypress! - Mount the keypad directly to your Arduino (hardware included), or use the enclosed RJ45 adapters with your own Ethernet cable to mount the keypad remotely, anywhere! - The shield has stacking headers so it's easy to add another shield or access any of the Arduino's other pinouts to integrate the keypad with the rest of your project. - The shield uses only two Arduino pins (SDA and SCL), keeping the Arduino's other digital and analog pins free for the rest of your project. (16-button keypads normally require 8 pins; the Lectrobox shield has its own onboard ATTiny processor that talks to the keypad for you.) - The shield never misses a keypress, even if your sketch is busy doing other things. (Again, this works because the shield has its own tiny processor that does nothing but scan the keypad.) ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Lectrobox | | Part Number | LEC-003-C | | Item Weight | 3.2 ounces | | Package Dimensions | 4.49 x 4.29 x 1.69 inches | | Item model number | 8541661249 | | Is Discontinued By Manufacturer | No | | Color | Black | | Style | Modern | | Item Package Quantity | 1 | | Included Components | Keypad Shield | | Batteries Included? | No | | Batteries Required? | No | ## Images ![Keypad Shield with 16-Button Matrix Keypad for Arduino - Image 1](https://m.media-amazon.com/images/I/71ER2ANwspL.jpg) ![Keypad Shield with 16-Button Matrix Keypad for Arduino - Image 2](https://m.media-amazon.com/images/I/91IRbnL9teL.jpg) ![Keypad Shield with 16-Button Matrix Keypad for Arduino - Image 3](https://m.media-amazon.com/images/I/91yqPXdZJXL.jpg) ![Keypad Shield with 16-Button Matrix Keypad for Arduino - Image 4](https://m.media-amazon.com/images/I/81dE5Yrf9lL.jpg) ![Keypad Shield with 16-Button Matrix Keypad for Arduino - Image 5](https://m.media-amazon.com/images/I/611TuOqgGKL.jpg) ## Questions & Answers **Q: Is there a way to swap out the buttons? Or do I just stick labels over them for my purpose?** A: The buttons are pretty permanently attached so stickers are the way to go. The backing plate of the keypad is attached by about 15 plastic rivets that look hard to remove. By the way, depending on your application the keypad also comes in white. **Q: What are the physical dimensions?** A: The shield is 76mm x 82mm. The shield alone is about 12mm high including connectors, and the keypad is about the same size on top of that. **Q: it looks like it uses I2C. What address?** A: For maximum compatibility with other shields, the Lectrobox Keypad Shield lets you choose between two different hard-coded TWI slave addresses. The default 7-bit address is 0x32. The alternate address is 0x75, which can be selected by soldering a jumper between the two shield pads marked OPT and power-cycling the shield. After the hardware has been reconfigured, the software library must also be configured to query the new TWI address. In your sketch's setup(), initialize the KeypadShield library by calling keypad.begin(0x75). ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Works perfectly, right out of the bag! *by D***Z on Reviewed in the United States on October 2, 2018* The media could not be loaded. Β After receiving this item, I plugged it right into my Uno, downloaded the supplied library, and built a test sketch. In less than three minutes I was up and running printing out keypresses. It's really that simple.The Library and SoftwareThe library is delightfully simple because all the work is being handled by a separate processor. This is fantastic! Very little code or data space, or processor cycles are consumed on your Arduino.The interface is polling- based over I2C, with the Arduino as master. The Ard asks for a byte. If a key has been hit, you get the byte back representing that value. If you get a 0 back, it means there was no byte/keypress available. If your Arduino sketch gets delayed doing something else and doesn't poll for awhile, don't worry. Keypressesa re buffered up, so you won't miss any -- and that buffer is in the keypad, not in your Arduino's precious RAM. Win!Physical KeypadThe keypad feels solid, with a nice key travel and punchy feel. I'd say it feels like an old touch-tone telephone. I think it will hold up nice for wear.SeparabilityThe unity comes with RJ-45 jacks that you can use to separate the keypad itself from the part of the shield that interfaces to the Arduino. There are four mounting screws on the keypad itself, and you can use an Ethernet cable to connect them. Very clever design.I like. ### ⭐⭐⭐⭐ 4.0 out of 5 stars Great idea *by W***M on Reviewed in the United States on November 7, 2017* I installed this keypad shield on a Mega and used the cable option, so not to have the keypad cover most of the Mega IOs. Following Lectrobox's instruction, everything worked well. In my opinion, the shield is too large. I did cut it down a bit to allow access to the extra Mega pins. I have a suggestion for the developer, do not use a shield. Mount the keypad on a circuit board which contains the keyboard scanning processor and just have the I2C and power wires between the keypad and any Arduino. I will be the first one to purchase one. I gave it four stars, because it is a great product, but not five because the shield is too large and the use of an ethernet cable is cumbersome.Update Dec.14/17Unfortunately my keypad stopped responding. This happened after I added one more Uno to the I2C bus. All the other boards on the bus work fine. I am glad this is only a hobby..... ### ⭐ 1.0 out of 5 stars Not a happy camper *by D***L on Reviewed in the United States on November 12, 2018* Downloaded keypad library,but it didn't work...no button was recognize in my serial monitor... --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/45444265-keypad-shield-with-16-button-matrix-keypad-for-arduino](https://www.desertcart.dk/products/45444265-keypad-shield-with-16-button-matrix-keypad-for-arduino) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-23*