Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

How to make a color detector circuit?

Status
Not open for further replies.

ghasia

Newbie level 6
Joined
Feb 28, 2007
Messages
12
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,372
Hi guys.
I have started a short project about color detector.Im lighting RGB Led is sequence to strike their light onto the object i want to detect, then LDR will get the reflected light from the object and make the voltage drop on the circuit(voltage devider).the voltage drop will get digitized by the ADC0831 to microproccessor(AT89S51) which process and give out through seri port.
THe problem is i cant get the output from the 8051(microprocessor).
Can some1 give me an advice,or is there any other way to make the color detector circuit?
Thanks in advance.
You can comment on my schematic circuit i've attached.
 

melc

Full Member level 6
Joined
Apr 8, 2005
Messages
391
Helped
55
Reputation
110
Reaction score
9
Trophy points
1,298
Activity points
3,595
Re: color detector

Do you really use a photoresistor for sensing the reflected wave ?
 

user0

Newbie level 3
Joined
Mar 19, 2007
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,304
Re: color detector

Hi!

Well, it's not a sulution, it's just a suggestion, but why don't you use the regular build of color-sensors? I mean three phototransistors (or LDRs) covered with a color-selective optical filter (red, green, blue). The signal given by the three device nearly RGB. Just an A/D, and you have your color.

Sorry, but I'm a newbie, I can't suggest any useful about the uC's prog.
 

MichelM

Member level 1
Joined
Aug 26, 2004
Messages
40
Helped
8
Reputation
16
Reaction score
5
Trophy points
1,288
Location
Grenoble,France
Activity points
265
Re: color detector

Hi

you can also use this device
h**p://www.taosinc.com/images/product/document/TCS230-E23.pdf
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top