Keypad Shield with 16-Button Matrix Keypad for Arduino

The media could not be loaded.  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.

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.....

Downloaded keypad library,but it didn't work...no button was recognize in my serial monitor...

This keypad worked well for me. I like that the keypad was either on an Arduino shield or remotely mountable. I in-fact intended to use it one way and ended up using it in the other configuration. It seemed solidly built and put together. I had one tiny problem where two of the key-caps were swapped. It was easy enough to disassemble it and rectify that. The sample Arduino library and code worked fine as well. I 3D-printed a case for it. I am using the keypad to add a safety lockout for a large bandsaw (like at a big-box store).I will purchase another one when I have a similar need.

We own an escape room. After experimenting with a few different keypads for an Arduino prop, we thankfully ran across this shield. Couldn't be happier. Super easy to plug-and-play, no wires to hook up, & works like a charm. We reached out to tech support for a question on code included in the library, and they went above & beyond in helping us out. We can't recommend this product enough!

I recently acquired a TenTec Jupiter HF Transceiver. One of the accessories is a remote control unit 302R that is no longer in production. With the help of a fellow HAM (and TenTec), we reversed engineered the 302R and built a replacement device using the Lectrobox keypad. After a minor keypad code change (Thank You Jeremy) the keypad worked perfectly. Attached are pictures of the original TenTec 302R keypad and the Lectrobox replacement. I think it came out great.Thanks Lectrobox (Jeremy)!