N900 light meter
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Third party applications that use this sensor include [http://www.tuug.fi/~toni/serendipity/index.php?/archives/14-Luxus-Light-Meter-v0.2-for-N900,-as-a-real-homescreen-widget.html Luxus Light Meter] and [http://norayr.arnet.am/weblog/?p=1710 photographic light meter]. | Third party applications that use this sensor include [http://www.tuug.fi/~toni/serendipity/index.php?/archives/14-Luxus-Light-Meter-v0.2-for-N900,-as-a-real-homescreen-widget.html Luxus Light Meter] and [http://norayr.arnet.am/weblog/?p=1710 photographic light meter]. | ||
| - | The sensor is also used to modulate the backlight in response to ambient light. | + | The sensor is also used to modulate the backlight in response to ambient light, although this behaviour [[Disable the ambient light sensor|can be disabled]]. |
[[Category:N900 Hardware]] | [[Category:N900 Hardware]] | ||
Revision as of 11:01, 22 February 2011
The light meter lets the software on the N900 sense ambient light levels.
Hardware
The device is a TAOS TSL2563.
Software
It is handled by the kernel module tsl2563.
The kernel driver exposes the lux value in the sysfs file
cat /sys/class/i2c-adapter/i2c-2/2-0029/lux 21
Under MeeGo it's available as
cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input
Third party applications that use this sensor include Luxus Light Meter and photographic light meter.
The sensor is also used to modulate the backlight in response to ambient light, although this behaviour can be disabled.