I am working on the "Ultrasonic range finder".. in this I have to calculate the distance of the obstacle using Ultrasonic sensor.
In this case, I am stuck with the problem,
If there are more than one obstacle in path at different distance, how to detect them with one sensor only & how to calculate the distance of each & every obstacle seperately.
You need to use a microcontroller or something similar in order to seperate the objects, which means you need to write the algorithm. the circuit can be the same ultrasound transducer readout circuit.