qmk_firmware/keyboards/handwired/rabijl/rotary_numpad/readme.md

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# Rotary Numpad
![rotary_numpad](https://i.imgur.com/GwEH4WOh.jpeg)
This is a personal project of mine where I wanted a number pad that I can put on the left side of keyboard that doesn't have a numberpad. I fell in love with the feel of rotary encoders on my 3d printer, so added three to be able to play around with.
* Keyboard Maintainer: [rabijl](https://github.com/rabijl)
* Hardware Supported: Sparkfun Pro Micro 5V (atmega32u4)
* Hardware Availability: https://www.sparkfun.com/products/12640
## How to build from scratch
I handsoldered gateron blue switches to a 3D printed case. The design is modified from the [Ultipad](https://www.thingiverse.com/thing:4248565). \
I used a sparkfun Pro Micro as my microcontroller and the pinout can be found in the `info.json`. I found this [site](https://golem.hu/article/pro-micro-pinout/) \
to be very useful to identify different pins. You can find useful information on rotary encoders from the qmk docs [here](https://docs.qmk.fm/#/reference_info_json?id=encoders) and [here](https://docs.qmk.fm/#/feature_encoders).
### matrix
Due to the three rotary encoders, I had to use most of the available pins. Fortunately, all the buttons still fit in a 6x4 matrix. Looking at the diagram below, the three buttons in the first column correspond to each encoder button.
```
┌──┐┌──┐┌──┐┌──┐
│0A││0B││0C││0D│
┌──┐ └──┘└──┘└──┘└──┘
│5A│
└──┘ ┌──┐┌──┐┌──┐┌──┐
│1A││1B││1C││1D│
└──┘└──┘└──┘└──┘
┌──┐┌──┐┌──┐┌──┐
│2A││2B││2C││2D│
┌──┐ └──┘└──┘└──┘│ │
│3D│ ┌──┐┌──┐┌──┐│ │
└──┘ │3A││3B││3C││ │
└──┘└──┘└──┘└──┘
┌──┐┌──┐┌──┐┌──┐
│4A││4B││4C││4D│
└──┘└──┘└──┘│ │
┌──┐ ┌──────┐┌──┐│ │
│5D│ │5B ││5C││ │
└──┘ └──────┘└──┘└──┘
```
## Flashing
Make example for this keyboard (after setting up your build environment):
qmk compile -kb handwired/rabijl/rotary_numpad -km default
Flashing example for this keyboard:
qmk flash -kb handwired/rabijl/rotary_numpad -km default
See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
## Bootloader
Enter the bootloader in 3 ways:
* **Short reset leads**: tap the reset lead to ground twice quickly after qmk is in flash mode
* **Keycode in layout**: double tap the key mapped to `QK_BOOT`. On the default keymap this can be found by holding in key (0,C) and tapping key (0,A), see the matrix section for the positions of these keys.
* **Bootmagic reset**: Hold down the key at (0,A) in the matrix (see matrix section) and plug in the keyboard
**Note:** if the keyboard doesn't show up after putting the keyboard in reset mode, check that
your user is added to the `tty` and/or `uucp` groups. \
You may need to logout after adding these groups to your user, for the changes to take affect.