Ambient Light Sensor - Bosch DDU 10 Manual

18 | Ambient Light Sensor

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18 Ambient Light Sensor
The DDU 10 is equipped with an ambient light sensor. The sensor is located at the front of
the DDU 10 below the LEDs on the right side. The sensor is linked to the channel "eamb"
with the unit lux.
The ambient light sensor can be used to calculate an automatic brightness switch. To use
this function, please follow the steps below.
1. Measure the range of light intensity in your vehicle during all relevant conditions.
The easiest option to evaluate the needed range is to log the "eamb" channel and ex-
pose the vehicle to the brightest and darkest conditions it will face during usage.
In this example, the expected value will be 10 lx as the lowest and 300 lx as the
highest measured light intensity in the cockpit.
2. Drag and drop a "Characteristic Curve" from the "Computed Sources" onto the "Com-
puted Channels".
This will open the configuration wizard.
3. Select "eamb" as input channel.
4. Assign the lowest lux value to the highest possible brightness switch setting (6) and
the highest lux value to the lowest switch position (1).
This will generate a linear change of the switch. If needed you can include additional
points to change the linear behavior.
5. Click "Next" when all points are defined as needed.
The "Analog Source Properties" window opens in the wizard. The maximum and min-
imum value of the channel is automatically assigned according to the previous set-
tings. In general, it should be from 1 to 6.
6. Click "Finish".
7. Assign a suiting name to the new channel and click "OK".
In this example, the channel will be named "Ambient_Light_Switch_Computed"
To avoid a toggling brightness setting, a math channel with a kind of hysteresis has to
be created.
8. Double click on "Math Channels" and click on "Add channel".
9. Copy the Formula below into the new math channel and replace the example name
with your name of the computed channel.
DDU 10
lowest
highest
Bosch Motorsport