This interface is same as the above, except the sound is used as the medium for detection. The distance of ranging is done by a concept called as Time of flight. Time of flight is the time taken from the transmitter sending its PING, to the receiver detecting its ECHO. The transmitter is a speaker and the receiver is a microphone. Since the reflected sound is composed of several noises generated by the surrounding articles and people etc, certain amount of filtering is essential when compared with the transmitted signals. However this is very unique to the place where this interface module is located. Hence a filed adjustment is always essential. These are to be further processed by suitable amplifiers and then given as logged signal to the controller. This is a good interface to make study in the context of embedded control system.
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