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Help regarding ultrasonic sensors for distance measurement

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Ron1024

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I want to use ultrasonic sensor for distance measurement but I don't know how it actually works.
can we connect US sensor directly to 8051 or we have to build some oscillator circuitry.
I want that the transmitter goes ON as soon as one of the pin of 8051 is made high.
Is it possible?
 
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yes! it is and you don't need any additional oscillator circuitry you can generate some kHz frequency by timer 0 and count the pules via timer 1 set a counter, do some maths and you get the elapsed time then use the following relation to find the distance travelled:
distance travelled = (speed of sound * time elapsed) /2

happy programming!
 
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