Quote Originally Posted by tohu thomson View Post
hello

I am measuring distance from here to there.

thank you
you may use ultrasonic transducrs as TX and Rx- send a pluse of Ultrasonic signal as TX while at the same time sarting a timer
when this signal travels forward and gets reflected from the place (by an arranged reflector) and as it is received by the tranducer (which is now configured as Rx) stop the timer by the int created by the received signal. you know the velocity of sound in normal air. use a formula to convert the uS of time accumulated into distance.