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[Reply #15 on:]

what should i do to make it better?

Now, we know what sensor you are using, but not how you have connected it to the Arduino. Feel free to volunteer any other info we might need, too.

[Reply #16 on:]

i just connected by jumber wire and breadboard

[Reply #17 on:]

i just connected by jumber wire and breadboard

Well, that's certainly enough detail to be sure that you wired it correctly. The only other thing I can think of then is that maybe you should have used duct tape.

[Reply #18 on:]

You could just check for the red, green and blue intensities being similar to the figures you get from the paper samples.

For example:

Code:

if((red < 150) && (green > 100) && (green < 200) && (blue > 200))
{
   Serial.println("Red");
}

The RGB values you describe don't seem to correspond to the colour of the paper that you say produced them so you probably have your sensor wired incorrectly or the channels swapped over, but since you seem to be getting consistent values for a given colour you can use those to tell when that colour is present.

[Reply #19 on:]

thanks for all replay but i have a question about the range
does anyone know more about this sensor technically??

[Reply #20 on:]

Please some answers?

[Reply #21 on:]

i try again but it still give's wrong value while i did the wire connection better?
Please anyone help me!