Handwire 8 key macro keyborad

Did you build a corne keyboard?

Did you need 42 switches, but could only order them in increments of 10?

What to do with the leftover 8 switches? Obiously make a shitty macro pad!

Components

• nice!nano v1, ProMicro,
• 8 key switches (left over from the Corne project),
• A 3.7 110mAh battery (if you are using a nice!nano),
• Case and plate (from the Scotto 9),
• Key cover for the leftover hole,
• A bunch of wires and soldering equipment
• 4x M2*6 screws
• 4x M2*8 screws (3 if you have a battery)
• 4x M263.5 brass threaded inserts/standoffs (3 if you have a battery)

Assembly

1. Insert switches into faceplate

Solder the 8 switches in the the cross pattern as described in Joe Scottos video, leaving the top middle key empty.

2. Modifying the case

Using a soldering iron thin out the wall at the USB-C port so the MCU can be close enoguth to the hole that it can be connected.

3. Connect the rows and columns to MCU

• Left column to pin 6

• Middle column to pin 7

• Right column to pin 8

• Top row to pin 15

• Middle row to pin 14

• Bottom row to pin 16

4. Flash the mcu

Download the ZMK firmware connect the nice!nano and flash the mcu by drag and dropping the firmware on the mounted disk.

After this i recommend testing the keyboard to check all the connections are good.

Connect the battery (if you have one, otherwise skip)

Solder the red wire to the B+ contact, and the black on to B-.

5. Assemle the keyboard

Insert the M2*6 screws into the bottomw of the case (3 if you have a battery, leave the top right or left hole empty). Inside of the case screw on the standoffs/threaded inserts.

Attach the MCU (and the batery) to the case using hot glue, making sure the MCU doesn't slide around when you connect it to the cable. I recommend you have atleast three connection points with the glue to the case.

Connect the faceplate to the standoffs using the M2*8 screws.

Connect the keyboard to the computer by cable or via bluetooth then enjoy.