crkbd (corn keyboard) cherry v3 build

Based off foostan's V3 Corne
Using foostan's and rafaeldelboni's build guides
Helpful videos: rafaeldelboni, Joe Scotto, Josean

Build

• CRKBD V3 3x6 Cherry hot-swap keyboard
• Includes OLED
• No RBG or Bluetooth

Contents

• Make parts list
  • Building and ordering the PCB
• Solder Diodes
• Solder Hot Swaps
• Install Top Components
• Compile and Flash Firmware
• Warning

Parts list

Keyboard

Name	Count	Details	Price
PCB	1x	Corne PCB Printed using JLCPCB	$40
Top Plate	2x	1.5-3mm - Files - Printed at school	$6
Bottom Plate	2x	Files - Printed at school	$2
OLED Cover	2x	Typeractive	$10
OLED	2x	OLED 128X32 OLED Display Module 0.91" IIC Communicate for ardunio	$0.30
Microcontroller	2x	TZT Pro Micro ATmega32U4 5V 16MHz Original Chip Type-C	$3
Keycaps	42x	Local	$0
Switches	42x	Only compatible with MX style - Cherry MX Black	$15
DIODES	100x	1N4148W T4 SOD-123	$1
Hot Swap Sockets	50x	Kailh Hot-swappable PCB socket Hot Plug for Gateron Outemu Cherry MX Switches Mechanical Keyboard	$8
TRRS Cable 4 pole	1x	Rallonge Jack 3.5mm 4 3 Pole TRRS to TRRS	$3
TRRS jack 4 pole	2x	TRRS 3.5 MM Audio Jack Connector	$2
Screw M2 5mm	50x	For case	$1
Spacer M2 9mm	10x	For case - Spacing Screw Hexagon Copper Female PCB Pillars Bolt M2	$2
Controller / OLED Base	4x	2.54mm Pin Header Female Single Row 40	$5
Pins	50x	PC Pins	$8
Reset Button	2x	3X6 4.3mm DIP	$2
Rubber feet	8x	Self Adhesive Round Rubber Bumpers	$2

Tools

Name	Count	Details	Price
Soldering Kit	1x	Kit	$9.8
Masking Tape	1x		$4

Building and ordering the PCB

Convert archived V3 KiCad project files to Gerber files
JLCPCB - How to generate Gerber and Drill files in KiCAD 8

Order the PCB from JLCPCB
GERBER Files

Solder Diodes

Solder each diode onto the pcb making sure to use flux and match polarity of the diode to the PCB.

Solder Hot Swaps

Solder each hot swap socket onto the pcb making sure to use flux and provide enough solder to hold the socket in place during switch installation / removal.

Install Top Components

Install the controller / OLED bases, reset button, trrs jack, controller, and oled.

For the controller use the gold pins and for the OLED use 0.5mm copper wire

Compile and Flash Firmware

QMK Configurator

Select keyoard, change layout if desired, and download firmware.

QMK Toolbox

Download software (windows or mac), hit reset button, flash.

Unplug, plug in other half, hit reset button, flash.

Done!

Warning

This was my first time soldering so definitely do a better job then I did or you will run into some issues. I had a short across my keyboard due to these two pins being soldered together.

Additionally, my first PCB was not working properly unfortunately and after thorough testing I had to remake the right half.