N900 light meter - Revision history

norayr: /* Software */

norayr — Sat, 14 Mar 2020 14:52:22 GMT

Software

← Older revision		Revision as of 14:52, 14 March 2020
Line 17:		Line 17:
	cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input		cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input
	</pre>		</pre>
		+
		+	Under Maemo-Leste it is available as
		+	<pre>
		+	/sys/class/i2c-adapter/i2c-2/2-0029/iio:device1/in_illuminance0_input
		+	</pre>
		+
	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR light has impact on the sensor. The lux value of N900 is a derived value from an [http://www.ams.com/eng/content/download/251504/992805/version/3 algorithm] calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides		Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR light has impact on the sensor. The lux value of N900 is a derived value from an [http://www.ams.com/eng/content/download/251504/992805/version/3 algorithm] calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides
	The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.		The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.

joerg_rw: /* Software */ wording

joerg_rw — Mon, 20 Oct 2014 14:45:21 GMT

Software: wording

← Older revision		Revision as of 14:45, 20 October 2014
Line 17:		Line 17:
	cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input		cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input
	</pre>		</pre>
-	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR light has impact on the sensor. The lux value of N900 is ~~generic and~~ derived from an [http://www.ams.com/eng/content/download/251504/992805/version/3 algorithm] calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides	+	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR light has impact on the sensor. The lux value of N900 is a derived value from an [http://www.ams.com/eng/content/download/251504/992805/version/3 algorithm] calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides
	The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.		The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.
	The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically s begins the next integration cycle.		The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically s begins the next integration cycle.

joerg_rw: /* Software */ typo

joerg_rw — Mon, 20 Oct 2014 14:43:50 GMT

Software: typo

← Older revision		Revision as of 14:43, 20 October 2014
Line 20:		Line 20:
	The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.		The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.
	The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically s begins the next integration cycle.		The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically s begins the next integration cycle.
-	[http://wstaw.org/m/2014/10/20/plasma-desktoprI1874.png diagram of ~~spactral~~ sensitivity channel0/1]	+	[http://wstaw.org/m/2014/10/20/plasma-desktoprI1874.png diagram of spectral sensitivity channel0/1]

	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].

joerg_rw: /* Software */ added link to algo for LUX calculation

joerg_rw — Mon, 20 Oct 2014 14:43:19 GMT

Software: added link to algo for LUX calculation

← Older revision		Revision as of 14:43, 20 October 2014
Line 17:		Line 17:
	cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input		cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input
	</pre>		</pre>
-	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR light has impact on the sensor. The lux value of N900 is generic and derived from an algorithm calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides	+	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR light has impact on the sensor. The lux value of N900 is generic and derived from an [http://www.ams.com/eng/content/download/251504/992805/version/3 algorithm] calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides
	The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.		The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.
	The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically s begins the next integration cycle.		The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically s begins the next integration cycle.
-	[[http://wstaw.org/m/2014/10/20/plasma-desktoprI1874.png diagram of spactral sensitivity channel0/1]]	+	[http://wstaw.org/m/2014/10/20/plasma-desktoprI1874.png diagram of spactral sensitivity channel0/1]

	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].

joerg_rw: /* Software */ diagram added

joerg_rw — Mon, 20 Oct 2014 14:36:53 GMT

Software: diagram added

← Older revision		Revision as of 14:36, 20 October 2014
Line 17:		Line 17:
	cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input		cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input
	</pre>		</pre>
-	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR ~~or UV~~ light has impact on the sensor. The lux value of N900 is generic and derived from an algorithm calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides	+	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR light has impact on the sensor. The lux value of N900 is generic and derived from an algorithm calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides
		+	The TSL2562 and TSL2563 are second-generation ambient light sensor devices. Each contains two integrating analog-to-digital converters (ADC) that integrate currents from two photodiodes. Integration of both channels occurs simultaneously. Upon completion of the conversion cycle, the conversion result is transferred to the Channel 0 and Channel 1 data registers, respectively.
		+	The transfers are double-buffered to ensure that the integrity of the data is maintained. After the transfer, the device automatically s begins the next integration cycle.
		+	[[http://wstaw.org/m/2014/10/20/plasma-desktoprI1874.png diagram of spactral sensitivity channel0/1]]

	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].

joerg_rw: /* Hardware */ TAOS->AMS

joerg_rw — Mon, 20 Oct 2014 14:24:19 GMT

Hardware: TAOS->AMS

← Older revision		Revision as of 14:24, 20 October 2014
Line 3:		Line 3:
	==Hardware==		==Hardware==

-	The device is a TAOS [http://www.taosinc.com/downloaddetail.aspx?did=141 TSL2563].	+	The device is a TAOS [http://www.taosinc.com/downloaddetail.aspx?did=141 TSL2563], now AMS [http://www.ams.com/eng/content/download/250126/975581/TSL2563_Datasheet_EN_v1.pdf TSL2563]

	==Software==		==Software==

joerg_rw: /* Software */ meego

joerg_rw — Mon, 20 Oct 2014 14:18:10 GMT

Software: meego

← Older revision		Revision as of 14:18, 20 October 2014
Line 17:		Line 17:
	cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input		cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input
	</pre>		</pre>
		+	Note: please check! This might only be one of the two different spectral channels and thus yield vastly incorrect LUX values when massive IR or UV light has impact on the sensor. The lux value of N900 is generic and derived from an algorithm calculating ''visible'' lux from roughly a difference between the two sensor values the ALS provides

	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].

amigadave: add link

amigadave — Tue, 22 Feb 2011 11:01:48 GMT

add link

← Older revision		Revision as of 11:01, 22 February 2011
Line 20:		Line 20:
	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]]

norayr: /* Software */

norayr — Fri, 18 Feb 2011 13:58:59 GMT

Software

← Older revision		Revision as of 13:58, 18 February 2011
Line 12:		Line 12:
	cat /sys/class/i2c-adapter/i2c-2/2-0029/lux		cat /sys/class/i2c-adapter/i2c-2/2-0029/lux
	21		21
		+
		+	Under MeeGo it's available as
		+	<pre>
		+	cat /sys/class/i2c-adapter/i2c-2/2-0029/device0/illuminance0_input
		+	</pre>

	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].

217.123.143.197: /* Software */ Removed MacHow spam

217.123.143.197 — Tue, 15 Feb 2011 20:32:30 GMT

Software: Removed MacHow spam

← Older revision		Revision as of 20:32, 15 February 2011
Line 14:		Line 14:

	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].
-
-	~~Solution to your Mac issues [http://www.mac-how.net Mac How]~~

	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.

	[[Category:N900 Hardware]]		[[Category:N900 Hardware]]