qmk_firmware/keyboards/lets_split_vitamins

Let's Split Vitamins Included

This readme and most of the code are from https://github.com/ahtn/tmk_keyboard/

Hardware files for the Let's Split vitamins included are stored here

First Time Setup

Clone the qmk_firmware repo and navigate to its top level directory. Once your build environment is setup, you'll be able to generate the default .hex using:

make lets_split_vitamins/rev1:default

You will see a lot of output and if everything worked correctly you will see the built hex file:

lets_split_vitamins_rev1_default.hex

If you would like to use one of the alternative keymaps, or create your own, copy one of the existing keymaps and run make like so:

make lets_split_vitamins/rev1:YOUR_KEYMAP_NAME

If everything worked correctly you will see a file:

lets_split_vitamins_rev1_YOUR_KEYMAP_NAME.hex

If you are on linux, you can also flash the hex file to the keyboard right after compilation, by adding :avrdude to the end of the make command like so:

make lets_split_vitamins/rev1:default:avrdude

For more information on customizing keymaps, take a look at the primary documentation for Customizing Your Keymap in the main readme.md.

Features

For the full Quantum Mechanical Keyboard feature list, see the parent readme.md.

Some features supported by the firmware:

• Either half can connect to the computer via USB, or both halves can be used independently.
• You only need 3 wires to connect the two halves. One for VCC, one for GND and one for serial communication.
• Optional support for I2C connection between the two halves if for some reason you require a faster connection between the two halves. Note this requires an extra wire between halves and pull-up resistors on the data lines. This is supported on the vitamins included.
  The extra data line can also be used for ws2812 type LEDs.
  If neither I2C nor RGB underglow is used, a TRS cable can be used instead of the 4wire TRRS cables.

Required Hardware

Amount	Description
1	PCB kit from novelkeys
48	MX compatible switches
48	1U keycaps
2	Half cases. A 3D model for the left half is available here. Mirror that to get a right-half case. Plate cases will be designed in the future.
1	USB-mini-B cable of your choice
1	TRS / TRRS cable

Optional Hardware

A speaker can be hooked-up to the footprint on the PCBs. It is already enabled in the default firmware from github.

A strip of WS2812 LEDs can be hooked up too, a guide will be written on how to do that once I get mine in the mail.
The PCB and connectors can safely handle 1A of current, but the USB standard is only rated at 500mA. Keep that in mind when picking the amount of LEDs.

Using I2C

On the left half PCB, there's two pads labled I2C Pullup if you want to use I2C, you need to bridge those two solder jumpers with a soldering iron.

You can change your configuration between serial and i2c by modifying your config.h file.

Notes on Software Configuration

Configuring the firmware is similar to any other QMK project. One thing to note is that MATRIX_ROWS in config.h is the total number of rows between the two halves, so because the let's split vitamins included has 4 rows in each half, it's MATRIX_ROWS=8.

Also, the current implementation assumes a maximum of 8 columns, but it would not be very difficult to adapt it to support more if required.

Flashing

Entering bootloader

If the keyboard isn't new, and has been flashed before, you need to enter bootloader. To enter bootloader, either use the assigned keys on the keymap, or if none have been put in the keymap, quickly short the reset to gnd twice. (Bottom pins of programming header, see image)

If using the default keymap, there's a reset key-combination on each half:
Lower (SW23) and left-shift (SW13) on the left half, or
Raise(SW44) and Enter(SW42) on the right half
It is recommended to add such reset keys to any custom keymaps. It shouldn't be necesarry to have one on each half, but the default layout has that.

The board exits bootloader mode after 8 seconds, if you haven't started flashing.

Linux

If this is the first time you're flashing the boards, it's easier to also flash EEPROM at the same time.

0. If your keyboard is plugged in, unplug it
1. Open a terminal, and navigate to the qmk_firmware folder
2. Run make lets_split_vitamins/rev1:default
3. Plug the keyboard in, if it's new, it should enter bootloader, if it's not new, see Entering bootloader on how to enter bootloader mode
4. Run dmesg | tail -10 | grep tty
5. Note the port the port the bootloader has connected to. If nothing shows see Entering bootloader on how to enter bootloader mode
6. Run avrdude -c avr109 -p m32u4 -P /dev/ttyACM0 -U flash:w:"lets_split_vitamins_rev1_default.hex":a -U eeprom:w:"./keyboards/lets_split_vitamins/eeprom-lefthand.eep":a for the left hand. Replace /dev/ttyACM0 with the port you noted down earlier. For the right hand, change it to eeprom-righthand.eep

Your keyboard should be flashed :)

In the future, you shouldn't need to flash EEPROM (it will in fact wear the eeprom memory, so don't) In the future just run:

make lets_split_vitamins/rev1:[KEYMAP]:avrdude

from the qmk_firmware folder.

Windows 10

Follow this guide here to get ubuntu bash on windows. Then, in ubuntu bash for windows, follow the linux instructions here

Then install AVRDUDESS.

0. If your keyboard is plugged in, unplug it
1. Open AVRDUDESS
2. Pick Atmel AppNote AVR109 Boot Loader as the programmer
3. Select ATMega32U4 as the MCU.
4. Check which COM ports are available under Port. Note these down if there's too many to remember.
5. Plug in the keyboard, If you just got the PCBs, there's only the bootloader on there, and it it will connect in bootloader mode automatically. If it's not new, see Entering bootloader on how to enter bootloader mode
6. Check the Port drop-down in AVRDUDESS, and see which new COM port has appeared. Do this within 8 seconds of entering bootloader. Pick the new COM port. If none have shown, try entering bootloader again.
7. Open a ubuntu bash terminal, and navigate to the qmk_firmware folder. Windows drives are in /mnt/[DRIVE LETTER no caps]/
8. Run make lets_split_vitamins/rev1:default
9. Go back into AVRDUDESS when it has finished compiling, and pick the .hex file in the flash field
10. In the EEPROM field, navigate into keyboards/lets_split_vitamins/ and pick eeprom-lefthand.eep or eeprom-righthand.eep depending on which half you are flashing.
11. Make sure the board is in bootloader mode, and hit the Program! button.
12. Repeat for the other half.

Your board should be flashed :) For further flashes, you should clear the eeprom field, as you shouldn't wear the eeprom unnecessarily.

You can plug either half into USB and it will work. you can also remove the TRS/TRRS cable, and plug both halves in. (which is why the default layout has reset on both halves)

Enjoy your keyboard! :D