Monday, March 26, 2018

4x4x4x4 with switch plate

48 key keyboard from three 4x4 PCBs

I made some PCB plates so that I can use plate mount switches.

The three 4x4x4x4x4 boards are connected together with solder bridges. 

The base is a 9x3" 1/8th thick 5052 aluminum plate I got off eBay. The aluminum is soft and I drilled it with a cordless drill.

 It is running the same TMK firmware as the other 4x4x4x4x4 board on github.

The plate was sanded with 220 grit wet/dry sandpaper. The raw edges were sharp and the drill holes had burs.

Plate mount switches. Without a plate these would have only the electrical contacts holding them in place, easy to bend or break.

The plate is on github. It has notches for switch top removal for compatible Cherry and Gateron switches.The holes are big enough to fit the tip of a screwdriver through but not big enough for the screw head, so spacers need to be installed before soldering in the switches.

Side view. You can see the plate, PCB and thick aluminum base. M2 spacer and screws hold the PCB to the aluminum base.

Closeup of the Arduino Micro clone. The sockets are the very low profile Peel-A-Way sockets.