# Hex Keypad 4x4 Matrix +2 - Ultimate Cherry MX
The Ultimate Cherry MX 4x4+2 version of my Hex Keypad designs. Ideal for early Retro Computing and 8-bit Microprocessor based projects.
- **Seller:** [Digicool Things](https://lectronz.com/stores/digicoolthings), Auckland, New Zealand
- **Price:** $49.90 (USD, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Retrocomputing, Kits, Keyboards
- **Product page:** https://lectronz.com/products/hex-keypad-4x4-matrix-2-ultimate-cherry-mx
## Options
**Keycap Colour**
- "Retro Beige" Keycap color (5 left)
- White Keycap color (5 left)
- Black Keycap color (5 left)
- "Retro Beige" and White color Keycap sets (+ Bonus Gift) [Add $8.00] (5 left)
- "Retro Beige" and Black color Keycap sets (+ Bonus Gift) [Add $8.00] (5 left)
- White and Black color Keycap sets (+ Bonus Gift) [Add $8.00] (5 left)
- "Retro Beige", White, and Black color Keycap sets (+ Bonus Gift) [Add $15.00] (5 left)
## Links
- [Documentation](https://digicoolthings.com/forum/viewtopic.php?t=32)
## Images
## Description
## What is it?
This is the Ultimate Cherry MX Keyswitch 4x4 Matrix +2 version of my Hexadecimal Keypad designs (see my separate Tindie listings for alternate versions).
Providing my Ultimate Hex Keypad design for your Retro Computing projects, which provides the ultimate key travel and tactile feedback of Cherry MX keyswitches. Providing ultimate comfort for hexadecimal data entry, and also providing full flexibility in how you choose to assemble your Hex Keypad layout. Also, the choice of a simple switch matrix, or a diode protected matrix (for preventing key ghosting).
The pin headers used for connecting the Keypad are breadboard friendly (see my Youtube videos), or the headers can easily connect with female PCB header sockets, that you might use on your own Retro computer project PCBs.
In addition, this Keypad has been designed using the standard 0.75 inch (19.05mm) centres key spacing, for natural comfort in Keypad data entry.
Cherry MX Brown Keyswitches were carefully chosen to fulfil the ultimate Retro style Hex Keypad style, with full-travel non-clicky tactile feedback.
**Note:** Please also see the seperate listing for my 4x5 Matrix version of this Keypad. Which version best suits your Hex Keypad based project, depends on how you wish to utilise the extra Function keys.
## How to Use the KeyPad
The Keypad provides a standard 4x4 matrix for the sixteen **0**-**9** and **A**-**F** Hexadecimal keys, together with two common wired function switches.
Normally you would connect the 4x4 matrix to an 8 bit I/O port to enable polling the 16 hexadecimal keys. The 2 function keys would normally have their common connection to GND, therefore providing 2 switched inputs to GND. Typically used to implement a system Reset (RST) switch, and a Function (FN) select switch input.
Pinouts for both the 8 way and 3 way pin headers are shown in the attached schematic diagram.
I provide the Keypad in **Kitset form**, so you can easily assemble it with your own soldering iron. All that is required is to solder in place the pin headers, optionally solder diode bypass solder-bridges (if not using the diodes), and then solder the supplied 18 genuine Cherry MX Brown Keyswitches. Four Nylon PCB Stand-offs and eight Nylon Screws are also supplied, for mounting your Keypad.
Below you'll find a YouTube video where you can see me describe my 2 year Ultimate Hex Keypad design journey, and then watch me assemble one of my Ultimate Cherry MX Hex Keypad Kitsets. Additional videos are also available on my Youtube channel, where I earlier described the project background and the design and testing of my earlier *budget* Tactile Switch version of my Hexadecimal 4x4 Matrix +2 Keypad (also available from my Tindie Store).
## What You Get
Each Ultimate Cherry MX Hex Keypad 4x4 Matrix +2 **Kitset** contains:
- 1x Silkscreened Double-Sided "MX Keypad" Hexadecimal Keypad PCB
- 18x Cherry MX Brown non-Clicky Tactile-feedback Keyswitches
- 18x 3D Printed two-colour MX Keycaps (Retro Beige, White or Black Color)
- (*Option*) 18x 3D Printed two-colour MX Keycaps (in second Color)
- (*Option*) 18x 3D Printed two-colour MX Keycaps (in third Color)
- (*Bonus Gift*) 1x Keycap Puller (**Only** if a second or third color *Option* selected)
- 1x 3D Printed Cherry MX Switch Opener (for optional diode insertion)
- 1x 3D Printed Cherry MX Keyswitch Mounting Plate
- 16x 1N4148 Small Signal Diodes (for optional diode matrix protection)
- 1x 20 Pin Header strip (for making the 8 + 3 Pin Headers)
- 4x M3 12mm Nylon PCB Stand-offs
- 8x M3 6mm Nylon Screws (for affixing the Stand-offs)
The **Bonus FREE Gift** of a Keycap Puller (see photo), is included **only** if you choose a combination of multiple Keycap color sets. This is because it's only needed to allow easy change-out of the Keycaps, when you buy a multiple color *Option*.
In addition to the two original Keycap colors featured in the below video (i.e. "Retro Beige" or White), I've now added a third color option (Black Keycaps with white legends). See the Black Keycap Keypad photo.
## Shipping policy
We pride ourselves with our "Next Business Day" Shipping Policy, and robust carton packaging. We also build to order, so if you order items with an "Assemble it for me" option selected, it may slightly delay shipping (while we build it for you).