sreejithu4u:
So sir ive got to work around with arduino timer? accuracy would be less is`nt it?
for that reason i started thinking about ultrasonic pair but im nt having much info how the supporting circuitry would be or atleast how the waveform would be so as to process it..
You could do what Ben Heckendorn did: use two Ping sensors, one for the transmitter where the receiver is removed and one for the receiver where the transmitter is removed.