This circuit is a color sensor without using Arduino or any other Microcontrollers.
Parts list:
IC LM324
IC4001
Resistor 1K (3pcs)
Resistor 510 ohm (3pcs)
Resistor 100K (3pcs)
LDR (3pcs)
Red LED (2pcs)
Green LED (2pcs)
Blue LED (2pcs)
Multiturn Potentiometer 200K
Multiturn Potentiometer 20K
Multiturn Potentiometer 10K
Capacitor 100nF
Capacitor 220uF
IC Socket 14dip (2pcs)
Circuit:
Video:
In following video you can see how this circuit works
