INDEX

COLOR SENSING:
I haven't heard of availability of color sensors. But we can make it from scratch. Suppose if you want to sense the color of ball. First thing you have to bring robot near the ball. The distance of the ball from the robot should be fixed. Second thing the effects of external light. First make the robot a
fixed distance from the ball. This is made by using a IR LED+photo diode combination. Bring robot close so that you will get a good response. For sensing color you use LED+LDR combination. But the problem with external light will be higher in this case. So you should provide some mechanical mechanism to hide external light. Photo diode or modulated 38Khz+TSOP is used for distance measurement. But photo diode is enough to get distance about 5cm or near. Use comparator output to the output of photo diode for distance measurement. Use LDR to sense the color. But the
accuracy is a real problem.