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i don't want to calculate manually... i just need to stop the car when it reaches the object at 5cm. Is that it need any calculation for this ? I am now implemented the transmitter and receiver but can not used it to avoid collision. I need brief explanation pleas!!!
That circuit won't work for a couple of reasons:
1) The 741 won't work at audible frequencies, let alone ultrasonic.
2) it doesn't measure the timing of the return signal, just the intensity, so you'll get a different result, if the object is made of something absorbent than if it's made of a reflective material.