This is a Remix of DaveM's Stream Cheap Mini Macro Keyboard. I made it bigger and Clampable to my Keyboard. I modified the Code a Bit and it Uses now the Keys F13-F24.

1.Print out both parts and tap the bolt holes in the base to fit an M3 bolt.
2.Insert the switches into the faceplate and wire them up. One post of each switch needs a signal wire, and all of the other posts are connected to ground.
3.Solder everything to the Arduino. The ground connection goes to "GND" and the signal wires go to pins 2 - 9 and 10, 14, 15, 16 . I numbered my buttons from left to right and top to bottom, but you can wire them in any order that you like. If you have the connectors, use those rather than making direct connections.
4.Bolt on the faceplate to the body.
5.Upload the firmware and enjoy!

Here is a more detailed Plan on DaveM's Webside: https://www.partsnotincluded.com/electronics/diy-stream-deck-mini-macro-keyboard/

Required:

5V Arduino Pro Micro
12 Cherry MX Switches (I used Cherry MX Blue, I got them from Ebay)
12 Keycaps (dont have them yet, waiting for them from China :D )
2 M3-10 Bolts
2 M3-35 Bolts (Leght can varie on the thickness of your Keyboard)
2 M3 Nuts
You will also need a USB to micro USB cable, solder,Rubber so the Keyboard doesnt slide around and a piece of double-sided tape.

Optional:

10 Pin Female Connector
4 Pin Female Connector
2X 12 Pin Male Connector, Right-Angle