# Dactyl with Arduino Pro Micro See https://github.com/adereth/dactyl-keyboard for the original Version. This Dactyl uses the Arduino Pro Mirco (2x). Wiring is a 6x6 Matrix like the [Dactyl Manuform](https://github.com/qmk/qmk_firmware/tree/master/keyboards/handwired/dactyl_manuform) ## Build the Firmware: - Build the firmware with `make handwired/dactyl_promicro:<keymapname>`, for example `make handwired/dactyl:default` - This will result in a hex file called `handwired_dactyl_promicro_<keymapname>.hex`, e.g. `handwired_dactyl_promicro_default.hex` How to setup your build enviroment can be found here: [Installing Build Tools](https://docs.qmk.fm/#/getting_started_build_tools) ## Required Hardware Apart from diodes and key switches for the keyboard matrix in each half, you will need: * 2 Arduino Pro Micros. You can find these on AliExpress for ≈3.50USD each. * 2 TRRS sockets and 1 TRRS cable, or 2 TRS sockets and 1 TRS cable Alternatively, you can use any sort of cable and socket that has at least 3 wires. If you want to use I2C to communicate between halves, you will need a cable with at least 4 wires and 2x 4.7kΩ pull-up resistors ## Optional Hardware A speaker can be hooked-up to either side to the `5` (`C6`) pin and `GND`, and turned on via `AUDIO_ENABLE`. ## Wiring The 3 wires of the TRS/TRRS cable need to connect GND, VCC, and digital pin 3 (i.e. PD0 on the ATmega32u4) between the two Pro Micros. Next, wire your key matrix to any of the remaining 17 IO pins of the pro micro and modify the `matrix.c` accordingly. The wiring for serial: ![serial wiring](https://i.imgur.com/C3D1GAQ.png) The wiring for i2c: ![i2c wiring](https://i.imgur.com/Hbzhc6E.png) The pull-up resistors may be placed on either half. It is also possible to use 4 resistors and have the pull-ups in both halves, but this is unnecessary in simple use cases. You can change your configuration between serial and i2c by modifying your `config.h` file. ## Notes on Software Configuration the keymaps in here are for the 4x5 layout of the keyboard only. ## Flashing To flash your firmware take a look at: [Flashing Instructions and Bootloader Information](https://docs.qmk.fm/#/flashing). Under Windows the most convenient way is installing the [QMK Drivers](https://github.com/qmk/qmk_driver_installer/releases) and use the [QMK Toolbox](https://github.com/qmk/qmk_toolbox/releases). ## Choosing which board to plug the USB cable into (choosing Master) ### Setting the right or left hand as master If you always plug the usb cable into the right board, add an extra flag to your `config.h` ``` #define MASTER_RIGHT ``` OR ``` #define MASTER_LEFT ``` Notes on Using Pro Micro 3.3V ----------------------------- Do update the `F_CPU` parameter in `rules.mk` to `8000000` which reflects the frequency on the 3.3V board. Also, if the slave board is producing weird characters in certain columns, update the following line in `matrix.c` to the following: ``` // _delay_us(30); // without this wait read unstable value. _delay_us(300); // without this wait read unstable value. ```