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I have a ultrasonic transducer which consist of 2 parts - a transmitter and a receiver.
I need to place the the transmitter and receiver at different places.
My receiver must be able to transmit the measured distance wireless-ly to a PDA.
I am confused about:
Whether I need to...
Sorry for using those unspecific terms.
I am a student studying on electronics.
I need a sensor to detect changes in environment. One example is: to detect a person passing through a walkway.
I found up on this photoelectric sensor, which is used to detect changes in...