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burak450
- 19th October 2008, 11:46
Hi,

I want to detect three colors(RGB) by using a circuit.I tried LDR and three leds(red,green,blue) but they are not sensitive.For example I can not detect colors more than 5 cm away.It should detect at least 10 cm away from LDR.

What do you suggest?Should I use other thing?
sinoteq
- 19th October 2008, 15:22
Hi,
Test one of these, not that bad price and is made for detecting colour.
TCS230 from TAOS.
burak450
- 19th October 2008, 22:23
this is my circuit.I used two blue leds one for red one for green.Black thing in the middle is LDR.How can I increase the sensibility(range of measurement)????


http://img148.imagevenue.com/loc834/th_50916_Cep005_122_834lo.jpg (http://img148.imagevenue.com/img.php?image=50916_Cep005_122_834lo.jpg)
skimask
- 19th October 2008, 23:37
this is my circuit.I used two blue leds one for red one for green.Black thing in the middle is LDR.How can I increase the sensibility(range of measurement)????

Lenses? Collimator?
sayzer
- 20th October 2008, 07:38
this is my circuit.I used two blue leds one for red one for green.Black thing in the middle is LDR.How can I increase the sensibility(range of measurement)????


http://img148.imagevenue.com/loc834/th_50916_Cep005_122_834lo.jpg (http://img148.imagevenue.com/img.php?image=50916_Cep005_122_834lo.jpg)

Ambient light sensitive photo diode is the way to go.

Many different versions available in the market, arkadaşım.


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Archangel
- 20th October 2008, 08:14
Hi burak450,
I scrapped out a video camcorder once, it had a unit composed of 3 chambers, 3 colored filters and 3 light sensors, presumably used for color correction, the filters were as you might have guessed red blue green. This unit was mounted on the front top of the camera above the lens.
burak450
- 20th October 2008, 11:24
I am sorry, but I dont get most of answers.HOw can I use lenses in this project?Is there any example?

I tried photodiode earlier.I didnt have right results.What kind of photodiode should I use? For example???
skimask
- 20th October 2008, 11:45
I am sorry, but I dont get most of answers.HOw can I use lenses in this project?Is there any example?

I tried photodiode earlier.I didnt have right results.What kind of photodiode should I use? For example???

http://en.wikipedia.org/wiki/Collimator
Archangel
- 20th October 2008, 18:05
Here is a crude picture of the device I mentioned.
http://www.picbasic.co.uk/forum/attachment.php?attachmentid=2921&d=1224521911
2921