for protection from ambient light better u cover with with black pastic tube...
is there any circuit that we can use to reduce the noise? ir is so sensitive to the environment is it enough by covering with black plastic tube?
anyway, i'll try it ..thanks for ur suggestion.
Generally speaking, no, there aren't good circuits to reduce the ambient interference. One of the primary sources of anguish for the students when I was in school, doing a similar project, were the fluorescent lights. Their flickering (too fast for human eyes to perceive) was significant, and generally made coding the control loop a real pain without LOTS of averaging of the detected voltage. The black plastic tube suggestion helped a lot in that case (typically little tubes of black heatshrink). Think of it like putting blinders on a horse... it only "sees" what it directly in front of it, the rest is suppressed.
i have made line tracing car but i did not make circuit diagram, but i will help u
u can see in attachment i,i have used a circuit and u have to use at least four circuit same like that, then u will get four digital outputs, u can store two output in one byte another two in next byte ,u have to compare both byte, according to that u will on left motor or right motor
LM324 is amplifier.. use LM393 for comparator
**broken link removed**
i dont say LM324 cannot be used as comparator. it can be used. but why use it when you get comparator IC's for comparitively low cost
using lm324 to get actual digital signal , u can connect led with its output to understand ,u can see when u put ldr on black place or white place your led will turn on and off ,so this information u can send to controller
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