Nice write-up on tinkering with an Ultrasonic sensor. I remember playing with these in the 1990’s, and it was not easy.
http://www.instructables.com/id/Arduino-Distance-Detector-with-a-Buzzer-and-LEDs/
Nice write-up on tinkering with an Ultrasonic sensor. I remember playing with these in the 1990’s, and it was not easy.
http://www.instructables.com/id/Arduino-Distance-Detector-with-a-Buzzer-and-LEDs/