Light sensor - Page 1
Forum section: electronics / projects

author: akgsh
author_rank: Newbie
timestamp: March 22, 2022, 10:55:36 pm
content: Hi,I am looking somebody who can help to work on a project on light sensor. My application is to detect light emitted from various surfaces under various types of laser excitation.When a low power IR laser hit the surface the surface emits colors from a material that was coated on the surface.The emitted colors are R,G,B and their combinations.In most of the cases the emitted light is very strong.The emitted light has to be detected by the light sensor and if the sensor detect the correct color it should show a GREEN LED button on the device.If no light then a RED led blink.The device has to the pocket type.If it was successfully done,then I need hundreds of pieces for various color detection.Those who are interested, please contact.ThanksKumar

author: moffy
author_rank: Super Contributor
timestamp: March 23, 2022, 12:54:33 am
content: A color sensor, just $12.75:https://core-electronics.com.au/tcs3200-color-sensor.html

author: Terry Bites
author_rank: Super Contributor
timestamp: March 24, 2022, 04:35:24 pm
content: They are old new stock- this chip was discontinued some years ago- as far as I know there is no second source or replacement part.

author: thm_w
author_rank: Super Contributor
timestamp: March 24, 2022, 10:24:47 pm
content: https://www.adafruit.com/product/1334https://learn.adafruit.com/adafruit-color-sensors

author: MasterT
author_rank: Frequent Contributor
timestamp: March 24, 2022, 10:41:14 pm
content: Didn't know IR could be converted up in energy to visual band.Where is the energy comes from , photon-phonon interaction?

author: thm_w
author_rank: Super Contributor
timestamp: March 24, 2022, 10:45:04 pm
content: Quote from: MasterT on March 24, 2022, 10:41:14 pmhttps://maxmax.com/phosphorsdyesandinks/infrared-phosphors-dyes-and-inks/infrared-up-conversion-powderhttps://www.phosphor-technology.com/ir-uv-phosphors/

author: MasterT
author_rank: Frequent Contributor
timestamp: March 24, 2022, 10:59:17 pm
content: Quote from: thm_w on March 24, 2022, 10:45:04 pmCould be. If it works, than no needs to determine a color, since it;s already known wavelength, just detect presence.

author: robzy
author_rank: Regular Contributor
timestamp: March 25, 2022, 03:48:00 am
content: Quote from: Terry Bites on March 24, 2022, 04:35:24 pmThere are lots of pin-incompatible options:https://ams.com/en/color-sensors

author: CatalinaWOW
author_rank: Super Contributor
timestamp: March 25, 2022, 04:56:24 am
content: A bit confused by your need for hundreds of parts for various color detection. These chips output an RGB value. You process that data to decide if that is close enough to the color you are looking for. I can't see where it would make sense to sequentially expose a sample to hundreds of chips with dedicated logic assigned to a color each. And it would be difficult to arrange viewing geometry so all of these hundreds of chips could simultaneously view hundreds of samples and even more difficult to sort out which output corresponded to which sample.If hundreds is merely to projected quantity of handheld sensors needed it makes sense. Just means you need to think about the interface to set the color and tolerance.