Small Gaming Keypad

This is a 21 keys gaming keypad, "similar" to the razer orbweaver. It has 20 MX switches organized with the same layout as the Ergodox/Redox.

Some sanding might necessary depending of your printer (there is a 0.1mm clearance for the base plate).

###Todo :

• Printed keys
• The wrist rest

###B.O.M. : Should sum up to less than 15€ on your favorite Chinese web-store.

• 1 Arduino pro micro
• 21 MX switches
• 12 M2 10mm self-tapping screws
• 2 M3 15/20mm screws + 2 2M3 nuts (3mm thick)
• 1 usb to micro-usb cable
• Some wires & soldering
• 20 switching diodes (I used 1N4148)

###Build instructions :

• Print everything
• Check that the build plate fits nicely in between the top&bottom parts and sand accordingly
• Screw the thumb part with the M3 nuts/screws
• Put your MX switches on the build plate
• Solder the switch matrix and diodes on the build plate (tutorial I wish I found earlier, magnificent album photo from MattDB). Using a hot glue gun helps to fix the wires before soldering.
• Solder two wires on the thumb switch and pass the wires inside the 4mm holes, then insert the MX thumb switch.
• Cut your micro-usb cable in two parts, near the micro usb plug. Then pass the usb cable though the 4mm hole on the back of the keypad. Re-solder the micro usb cable
• Solder all wire on the arduino pro micro and plug the micro usb cable
• Flash the firmware and check that everything is working (QMK keyboard firmware )
• Stuff everything inside the bottom part and but the base plate in place. Again, hot glue gun is your friend.
• Screw the top piece with the M2 screws
• Put your keycaps
• Enjoy