(r2) ColourSensor < AFNOG

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---+ The Color Sensor
---++ Color Sensor Types

The color sensor is used to show the paper moving in front of the distance sensor in the right color. Just like in case of the RGB LEDs different models can be found on the market. There are essentially two different types, using different sensor chips built onto a variety of breakout boards.

| <p><img alt="" height="267" src="%ATTACHURL%/GY-31.png" width="257" /></p> <p>The GY-31 board based on the TCS2300</p> | <p><img alt="" height="267" src="%ATTACHURL%/tcs34725.png" width="288" /></p> <p>This board is built around the TCS34725 chip</p> |
Both chips implement color filters which let only one of the base colors pass onto a photo diode, whose intensity is then measured before switching to the next base color. The [[https://www.mouser.com/catalog/specsheets/TCS3200-E11.pdf][TCS2300]] converts the photo diode signal into a frequency proportional to the light intensity. This board comes with 4 white LEDs to illuminate the colored object in front of it. Certain modules switch these LEDs permanently on while others (like the one shown on the photo) have a pin enabling the LEDs by software. This perticular board also has a plastic ring protecting the sensor from direct light from the LEDs.

The [[https://cdn-shop.adafruit.com/datasheets/TCS34725.pdf][TCS34725]] does essentially the same thing but has an !I2C interface in addition providing easy interfacing with a micro-controller. Here we have a single, less intense white LED, the yellow device on the photo.

-- %USERSIG{UliRaich - 2018-01-31}%

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Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
png	GY-31.png	r1	manage	76.3 K	2018-01-31 - 10:24	UliRaich
png	tcs34725.png	r1	manage	191.1 K	2018-01-31 - 10:24	UliRaich

Topic revision: r2 - 2018-02-08 - UliRaich