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docs/en/pimoroni_trackball.md

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+# Pimoroni Trackball
+
+Module handles usage of Trackball Breakout by Pimoroni.
+
+Product page: https://shop.pimoroni.com/products/trackball-breakout
+
+### Usage
+
+Declare I2C bus and add this module in your main class.
+
+```python
+from kmk.modules.pimoroni_trackball import Trackball, TrackballMode
+import busio as io
+
+i2c = io.I2C(scl=board.D3, sda=board.D2)
+trackball = Trackball(i2c)
+keyboard.modules.append(trackball)
+```
+
+Module will also work when you cannot use `busio` and do `import bitbangio as io` instead.
+
+### Key inputs, other handler combinations
+
+If you have used this thing on a mobile device, you will know it excels at cursor movement
+
+```python
+
+from kmk.modules.pimoroni_trackball import Trackball, TrackballMode, PointingHandler, KeyHandler, ScrollHandler, ScrollDirection
+
+trackball = Trackball(i2c, mode=TrackballMode.MOUSE_MODE, handlers=[
+    # act like an encoder, input arrow keys
+    KeyHandler(KC.UP, KC.RIGHT, KC.DOWN, KC.LEFT, KC.ENTER), 
+    # on layer 1 and above use the default pointing behavior
+    PointingHandler(),
+    # use ScrollDirection.NATURAL (default) or REVERSE to change the scrolling direction
+    ScrollHandler(scroll_direction=ScrollDirection.NATURAL)
+])
+
+# now you can use these KeyCodes:
+
+KC.TB_NEXT_HANDLER # rotates through available 
+KC.TB_HANDLER(0) # activate KeyHandler 
+KC.TB_HANDLER(1) # activate MouseHandler
+
+```
+
+
+### Backlight
+
+Setup backlight color using below commands:
+
+```python
+trackball.set_rgbw(r, g, b, w)
+trackball.set_red(brightness)
+trackball.set_green(brightness)
+trackball.set_blue(brightness)
+trackball.set_white(brightness)
+```
+
+This module exposes one keycode `TB_MODE`, which on hold switches between `MOUSE_MODE` and `SCROLL_MODE`.
+To choose the default mode, pass it in `Trackball` constructor.