Here , i am giving the circuit of color detetor.
The circuit can sense eight colours, i.e. blue, green and red (RGB) that is primary color; magenta, yellow and cyan (secondary colors); and black and white. The circuit is based on the fundamentals of optics and digital electronics. The object whose color is required to be detected should be placed in front of the system. The light rays reflected from the object will fall on the three convex lenses which are fixed in front of the three LDRs.
The LDR is mounded in a tube, behind a lens, and aimed at the object. The colored glass filter should be fixed in front of the LDR as shown in the figure. Make three of that kind and fix them in a suitable case. Adjustments are critical and the gadget performance would depend upon its proper fabrication and use of correct filters as well as light conditions
