Figure 2.1: Orientation Sensor Axes
2.2.8
Status LED
The status LED illuminates while M400C is operating to indicate that the device is powered and
functional. Table 2.3 enumerates the different LED states.
Color
Pattern
Description
Green
Solid
Normal operation
Yellow
Solid
Waiting for video data
Red
Solid
Error state
Table 2.3: Status LED states
When M400C is in an error state, the USB API can be queried to get more information on the
specific error.
2.3
Features
2.3.1
Auto-rotation
M400C can use the onboard orientation sensor to detect if the unit is being worn on the left or
right side of the user’s head and auto-rotate the display accordingly. Note that the autorotation
algorithm may produce incorrect results if the user’s head is not relatively level to the ground.
Table 2.4 describes the effect of the Autorotation and Force Left Eye commands during use.
Autorotation
0
1
Force Left Eye
0
Left eye mode
Automatic
1
Right eye mode
Automatic
Table 2.4: Autorotation and Force Left Eye settings
8
Revision 7
Vuzix Corporation
