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foostan's Corne Keyboard (crkbd v2)

Check the final product
Check the video of this build

Check List:

Part list (Original)

Firmware

Install/Configure QMK

First to compile the crkbd qmk firmware you will need to use avr-gcc 8.

In Arch use the following commands to install the dependencies:

sudo pacman --needed -U https://archive.archlinux.org/packages/a/avr-gcc/avr-gcc-8.3.0-1-x86_64.pkg.tar.xz
sudo pacman -S --needed \
       arm-none-eabi-binutils \
       arm-none-eabi-gcc \
       arm-none-eabi-newlib \
       avrdude \
       avr-binutils \
       avr-libc \
       base-devel \
       clang \
       dfu-programmer \
       dfu-util \
       diffutils \
       gcc \
       git \
       libusb-compat \
       python \
       python-pip \
       unzip \
       wget \
       zip

Then clone the qmk firmware and then

Compile/Flash Firmware

make crkbd:default:flash

This will compile and start to flash the firmware, make sure your pro-micro is connected in the usb port and the following message will be shown:

QMK Firmware 0.9.19
WARNING:
 Can not run bin/qmk! This tool will be required when the develop branch is merged on 2020 Aug 29.

 Please run util/qmk_install.sh to install all the dependencies QMK requires.

Making crkbd/rev1 with keymap default and target flash

avr-gcc (GCC) 8.3.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Size before:
   text    data     bss     dec     hex filename
      0   21574       0   21574    5446 .build/crkbd_rev1_default.hex

Copying crkbd_rev1_default.hex to qmk_firmware folder                                               [OK]
Checking file size of crkbd_rev1_default.hex                                                        [OK]
 * The firmware size is fine - 21574/28672 (75%, 7098 bytes free)
Detecting USB port, reset your controller now..................

At this moment, with some tweezers, reset the pro-micro Reseting Pro-Micro

If you did right the following will be shown:

Device /dev/ttyACM0 has appeared; assuming it is the controller.
Waiting for /dev/ttyACM0 to become writable..

Connecting to programmer: .
Found programmer: Id = "CATERIN"; type = S
    Software Version = 1.0; No Hardware Version given.
Programmer supports auto addr increment.
Programmer supports buffered memory access with buffersize=128 bytes.

Programmer supports the following devices:
    Device code: 0x44

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e9587 (probably m32u4)
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file ".build/crkbd_rev1_default.hex"
avrdude: input file .build/crkbd_rev1_default.hex auto detected as Intel Hex
avrdude: writing flash (21574 bytes):

Writing | ################################################## | 100% 1.64s

avrdude: 21574 bytes of flash written
avrdude: verifying flash memory against .build/crkbd_rev1_default.hex:
avrdude: load data flash data from input file .build/crkbd_rev1_default.hex:
avrdude: input file .build/crkbd_rev1_default.hex auto detected as Intel Hex
avrdude: input file .build/crkbd_rev1_default.hex contains 21574 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.16s

avrdude: verifying ...
avrdude: 21574 bytes of flash verified

avrdude: safemode: Fuses OK (E:CB, H:D8, L:FF)

avrdude done.  Thank you.

Do this for both pro-micros and you good to go.

Flashing Pro-Micro

Building

Mark pcbs sides

This is self explanatory, but is very helpfull to mark your pcbs sides.

Marking Pcbs

Solder OLED jumper pads

You need to solder the oled jumper pads in order to use oleds. OLED jumper pads

Soldering Pin Sockets

I had to double check sometimes to see if I was soldering in the right side of the pcb, that's why marking the pcbs before helps a lot thought the process. Pin Connetors 1 The other problem I had was that the PCB is designed to work in both sides, so you have 2 sets of holes to solder your pro micro, the trick to know which hole to use is use the ones that are inside a white box line looking from above. Pin Connetors 2 From bellow the holes are passing thought the white line. Pin Connetors 3

Solder diodes

The SMD diodes are trick at first, they are pretty small and they have polarity, make sure to match the polarity with PCB. Solder diodes 1

To make it easier to solder, first put some solder on one of the PCB diode contacts and then with a tweezer hold the diode over the solder and heat it to stick the diode, proceed to the other diode contact and solder it normally. Solder diodes 2

All diodes soldered. Solder diodes 3

On both PCBs Solder diodes 4

Prepare copper wire to be the new pro-micro/OLED male pin

Instead of using thru-hole diode legs for this step, I experimented doing the male pin legs with some 0.5mm copper wire, the only down side doing this is that the copper wire I bought came covered with a thin plastic layer that I had to remove in order to make it electrical conductor. Pro copper legs 1

Left wire is the one I sanded out the plastic compared with how it came on the right. Pro copper legs 2

I used some masking tape to help me organize the wires. Pro copper legs 3

Solder pro-micro male sockets "legs"

Also another benefit of using masking tape is to don't let the solder go thought the hole and "glue" with the PCB socket. Solder pro-micro male 1

Is a good idea to use some solder flux on the copper wires to help with the soldering Solder pro-micro male 2

On both PCBs Solder pro-micro male 3

Rewire oled socket with new "legs"

This was the hardest part of all project, de-soldering the OLED current pins without a good solder sucker wasn't a good idea. Rewire oled 1

I was so frustrated with the results that I forgot to take pictures of this process. Rewire oled 2

Solder TRRS

An easy thru-hole solder, just had to straight the component legs before. Soldering TTRS 1

Result from above. Soldering TTRS 2

Manual test

At this moment I had enough to setup a manual test, to check if all I did until here was ok. Manual Test 1

I when to keyboardtester and plugged the new keyboard to the PC. Manual Test 2

I simulated the switch behaviour with the tweezer. Manual Test 3

Solder reset

Again an easy step, just had to straight the component legs before. Soldering reset 1

Result from above. Soldering reset 2

Solder hot-swaps

Very similar to soldering the diodes, but with a way bigger component. Solder hot-swaps

Mount the case

Just some screws and the build was almost finished. Mount the case 1

Adding the switches over the case. Mount the case 2

Checking if all is working before the keycaps Mount the case 3

Final product

Final

(optional) Wood Wristrest

I asked my father to create some wristrest for this project. Wood Wristrest 1

I didn't made much in this step, but just helped him as an assistant, maybe in the future I will have enough wood skill to do so. Wood Wristrest 2