### Tilt Sensor

There are several modes to subscribe to sensor, providing 2-axis, 3-axis and bump detect data.

An example:

```python
from pylgbst.hub import MoveHub, TiltSensor
import time

def callback(pitch, roll, yaw):
    print("Pitch: %s / Roll: %s / Yaw: %s" % (pitch, roll, yaw))

hub = MoveHub()

hub.tilt_sensor.subscribe(callback, mode=TiltSensor.MODE_3AXIS_SIMPLE)
time.sleep(60) # turn MoveHub block in different ways
hub.tilt_sensor.unsubscribe(callback)
```

`TiltSensor` sensor mode constants:
- `MODE_2AXIS_SIMPLE` - use `callback(state)` for 2-axis simple state detect
- `MODE_2AXIS_FULL` - use `callback(roll, pitch)` for 2-axis roll&pitch degree values
- `MODE_3AXIS_SIMPLE` - use `callback(state)` for 3-axis simple state detect
- `MODE_3AXIS_FULL` - use `callback(roll, pitch)` for 2-axis roll&pitch degree values
- `MODE_BUMP_COUNT` - use `callback(count)` to detect bumps

There are tilt sensor constants for "simple" states, for 2-axis mode their names are also available through `TiltSensor.DUO_STATES`:
- `DUO_HORIZ` - "HORIZONTAL"
- `DUO_DOWN` - "DOWN"
- `DUO_LEFT` - "LEFT"
- `DUO_RIGHT` - "RIGHT"
- `DUO_UP` - "UP"
  
For 3-axis simple mode map name is `TiltSensor.TRI_STATES` with values:
- `TRI_BACK` - "BACK"
- `TRI_UP` - "UP"
- `TRI_DOWN` - "DOWN"
- `TRI_LEFT` - "LEFT"
- `TRI_RIGHT` - "RIGHT"
- `TRI_FRONT` - "FRONT"