Simple Color Detection Circuit

By using reflected light from the LED, the photoresistor outputs varying resistances. Sooo, if the LED is shining blue, and you wave a blue object over the photoresistor, the indicator LED lights up indicating it is a color match.

THE POSSIBILITIES!!

A machine that sorts M&M's by color? A robot that criticizes you on your bad color-coordinating fashion choices? Something useful like an aid for colorblind/blind people?

P.S., I think I said "photodiode" in the video; I meant photoresistor.

Category:

Science & Technology

Tags:

• simple
• color
• detection
• circuit
• rgb
• led
• photoresistor
• electronics
• project

[miikebass]

Can you change the color to the color detected?

[kyrib]

well, the LED should already be at the color detected, because you have to set the RGB LED to the color you want to detect in the first place. Like, if you want to detect a red object, you have to set the RGB LED to red, and etc.

[twilight1138]

Why not switch Red, Green, Blue quickly in sequence and measure the intensity in each channel ? That way you directly get the color and don't need to set the color first for comparison.

[kyrib]

Well, then that's not so "simple", is it? ;) How do you measure intensity? Can i do that with just parts I have laying around?

[ken25taylor]

great demo on how coloured light only reflects itself, I really enjoyed this :)

[infringinator]

I think i found the woman of my dreams

[anthonyongjg]

nice project...recently im testing with the colour sensor circuit..can i have ur schematic diagram for the connection for the circuit?thank a lot...

[joumel100]

i'm very interested in this amazing project.

what are the wire connections in microcontroller? can i get a copy of schematic diagram with the microcontroller connected? thank you

[SamuelAaronWard]

@kyrib ...Yes, you can do that with the parts you already have in your circuit. It simply requires a little code modification. How do you measure intensity, you ask? Create a voltage divider using a fixed resistance and your photoresistor / photodiode in series between +5VDC and ground. Measure the voltage across your photoresistor using your microprocessor's analog-to-digital converter pin, and that's how you know the intensity of red, green, and blue light reflected by the object. :)

[inspectorcritic]

Could you make a detector say a black widow spider then cross it over with a picture of JFK to see if it will match? I know Taos color sensor are pretty accurate.

[jgoodell1104]

Can I get a copy of the schematic desighn ?

[ngdj999]

very very interesting! Im working on an interactive installation with my team but for a projection screen. And this is very useful as a research!

[keithosmarferrer]

does  it need any microcontroller or is it just a basic analogue circuit?