pranam77 said:Anyways...the picture is not visible. You may use any value of Photo transistor. Only thing you have to do is to adjust the resistance with pull up or downs and get the required logic out when the track is detected and the other logic when track is not detected. Good luck
pranam77 said:Are you refering to a LDR when you say Photo resistor? You may use any photo diode and vary the variable pot to get different "Logic's" when the track is detected and when not.
Yes..when you use IR LED as the transmitter, it is good to use Photo diode as a receiver.qdnboy said:I would say replace the photo resistor with a phototransistor too. Phototransistor reacts much quicker to light than photoresistor.