In this video, I show you how to measure distance with three different ultrasonic range finder circuits using the HC-SR04 Ultrasonic Range Finder. The first circuit is a basic range finder circuit using only an Arduino and the ultrasonic range finder. Then I show you a more accurate range finder circuit that factors temperature into the speed of sound formula. Finally, I show you the most accurate range finder circuit that takes into account both humidity and temperature in the equation for the speed of sound.
Each Monday is ArduinoMonday here at Adafruit! Be sure to check out our posts, tutorials and new Arduino related products. Adafruit manufactures the Arduino right here in the United States in cooperation with arduino.cc. We have a huge selection of Arduino accessories and all the code and tutorials to get you up and running in no time!