Update readme.md

tigoe · Jun 21, 2021 · 600d7fd · 600d7fd
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 # Light Sensors
 
+This page covers a variety of light sensors, most of which are either single-channel or three- or four-channel sensors (RGB or RGBC). There are also a few specialty sensors, like the MAX30105 sensor which can be used for pulse oximetry or the APDS-9960 sensor which can measure RGB as well as sensing gesture and proximity. There is a separate page for [multi-channel spectral sensors](spectral-sensors). 
+
+## Luminosity Sensors 
+TSL2591 - Light levels, visible & IR
+* [Adafruit breakout board](https://www.adafruit.com/product/1980)
+* [Adafruit library](https://github.com/adafruit/Adafruit_TSL2591_Library)
+* [Datasheet](https://github.com/adafruit/Adafruit_TSL2591_Library)
+
+
+## RGB Sensors
 ISL29125 - RGB with IR blocking filter
 * [Sparkfun breakout board](https://www.sparkfun.com/products/12829)
 * [Sparkfun library](https://github.com/sparkfun/SparkFun_ISL29125_Breakout_Arduino_Library)
 * [Datasheet](https://www.renesas.com/us/en/www/doc/datasheet/isl29125.pdf)
 
+## RGBC Sensors
 TCS34725 - 4-channel, red, green, blue, clear
 * [Adafruit breakout board](https://www.adafruit.com/product/1334)
 * [Adafruit library](https://github.com/adafruit/Adafruit_TCS34725)
 * [Datasheet](https://ams.com/documents/20143/36005/TCS3472_DS000390_2-00.pdf/6e452176-2407-faaf-a590-d526c78c7432)
 
-TSL2591 - Light levels, visible & IR
-* [Adafruit breakout board](https://www.adafruit.com/product/1980)
-* [Adafruit library](https://github.com/adafruit/Adafruit_TSL2591_Library)
-* [Datasheet](https://github.com/adafruit/Adafruit_TSL2591_Library)
-
-GA1AS202L - ambient light
-* [Adafruit breakout board](https://www.adafruit.com/product/1384)
-* [Datasheet](https://www.digchip.com/datasheets/download_datasheet.php?id=3860632&part-number=GA1A1S202WP)
-
-APDS9301 - ambient light sensor
-* [Sparkfun breakout board](https://www.sparkfun.com/products/retired/14350) part is retired
-* [Sparkfun library](https://www.sparkfun.com/products/retired/14350) part is retired
-[Datasheet](https://cdn.sparkfun.com/assets/3/2/c/0/8/AV02-2315EN0.pdf)
 
 APDS9960 - RGB and gesture
 * [Sparkfun breakout board](https://www.sparkfun.com/products/12787)
@@ -33,38 +31,42 @@ APDS9960 - RGB and gesture
 * [Arduino Library](https://www.arduino.cc/en/Reference/ArduinoAPDS9960)
 * [Datasheet](https://docs.broadcom.com/docs/AV02-4191EN)
 
+## Specialty Sensors
+
 MAX30105 - red, IR, green, for pulse oximetry and particle detection
 * [Sparkfun breakout board](https://www.sparkfun.com/products/14045)
 * [Sparkfun library](https://github.com/sparkfun/SparkFun_MAX3010x_Sensor_Library)
 * [Datasheet](https://datasheets.maximintegrated.com/en/ds/MAX30105.pdf)
 * Being replaced by [MAX30101](https://datasheets.maximintegrated.com/en/ds/MAX30101.pdf)
 
-AS7262 - 6 channel: red, orange, yellow, green, blue, and violet.
-
-AS7263 - 6-channel with Near infrared
-* [Adafruit breakout board (AS7262)](https://www.adafruit.com/product/3779)
-* [Sparkfun breakout board (AS7262)](https://www.sparkfun.com/products/14347)
-* [Sparkfun breakout board (AS7263)](https://www.sparkfun.com/products/14351)
-* [Adafruit library](https://github.com/adafruit/Adafruit_AS726x)
-* Sparkfun breakout board
-* [Sparkfun library](https://github.com/sparkfun/Qwiic_Spectral_Sensor_AS726X)
-* [Sparkfun hookup guide](https://learn.sparkfun.com/tutorials/as726x-nirvi)
-* [Datasheet AS7262](https://ams.com/documents/20143/36005/AS7262_DS000486_2-00.pdf/0031f605-5629-e030-73b2-f365fd36a43b)
-* [Datasheet AS7263](https://ams.com/documents/20143/36005/AS7263_DS000476_1-00.pdf/4bd22964-7fe0-2053-3e97-906f0836182f)
 
+## Discontinued Sensors
 
+GA1AS202L - ambient light
+* [Adafruit breakout board](https://www.adafruit.com/product/1384)
+* [Datasheet](https://www.digchip.com/datasheets/download_datasheet.php?id=3860632&part-number=GA1A1S202WP)
 
-AS7341 - 11-channel with NIR and clear
-* [AMS library](https://ams.com/documents/20143/36005/AS7341_SW000273_3-00.zip/f0248ade-918b-a9ba-d403-dc2115bee266) in Documents/application notes/I2C interface with Arduino
-* [Datasheet](https://media.digikey.com/pdf/Data%20Sheets/Austriamicrosystems%20PDFs/AS7341_DS.pdf)
-* [More info](https://ams.com/as7341-11-channel-spectral-sensor-eval-kit#tab/tools)
+APDS9301 - ambient light sensor
+* [Sparkfun breakout board](https://www.sparkfun.com/products/retired/14350) part is retired
+* [Sparkfun library](https://www.sparkfun.com/products/retired/14350) part is retired
+[Datasheet](https://cdn.sparkfun.com/assets/3/2/c/0/8/AV02-2315EN0.pdf)
 
-## Publications
+## Background Reading
 
 * Rune Madsen's [Programming Design Systems](https://programmingdesignsystems.com/) book is a great intro to visual design and programming and his chapters on color are a helpful intro to color theory for understanding sensors and LED color mixing: 
    * [A Short History of Color Theory](https://programmingdesignsystems.com/color/a-short-history-of-color-theory/index.html#a-short-history-of-color-theory-xZzRFOZ)
    * [Color Models and Color Spaces](https://programmingdesignsystems.com/color/color-models-and-color-spaces/index.html#color-models-and-color-spaces-JDQ1fRD)
 * A pretty good [introduction to colorimetry](https://medium.com/hipster-color-science/a-beginners-guide-to-colorimetry-401f1830b65a)
+* A quick introduction to [Melanopic Equivalent Daylight Illuminace (EDI)](https://biosinstitute.org/melanopic-equivalent-daylight-illuminance/)
+* [CIE Position Statement on Non-Visual Effects of Light](http://cie.co.at/files/CIE%20Position%20Statement%20-%20Proper%20Light%20at%20the%20Proper%20Time%20(2019)_0.pdf) 
+* [User Guide to the &alpha;-opic Toolbox
+for implementing CIE S 026](http://files.cie.co.at/CIE%20S%20026%20alpha-opic%20Toolbox%20User%20Guide.pdf)
+* [Userguide to the Equivalent Daylight (D65) 
+Illuminance Toolbox](https://www.nsvv.nl/wp-content/uploads/2019/03/CIE-S-026-EDI-Toolbox-Userguide-vE1.05x.pdf)
+* White paper from AMS: [Chip-scale spectral sensing:
+understanding the new uses
+for ultra-precise light-source
+measurement ](https://ams.com/documents/20143/215005/ams_WhitePaper_Chip-scale_spectral_sensing_022021.pdf)
 * AMS Application Note: [DN40-Rev 1.0 – Lux and CCT Calculations using ams Color Sensors](https://ams.com/documents/20143/80162/ColorSensors_AN000166_1-00.pdf/c0b4a4b4-9948-f2a7-f8a1-36a8208bd0a9) 
 * [Accurate method for computing correlated color temperature](https://www.osapublishing.org/DirectPDFAccess/271508BC-9A43-6E9C-75B4043231D56AE2_344803/oe-24-13-14066.pdf?da=1&id=344803&seq=0&mobile=no)
 * [Correlated Color Temperature Determination for LED Modules Using a Digital Color Sensor](https://www.scientificbulletin.upb.ro/rev_docs_arhiva/full3fa_651029.pdf)