Ultrasonic Distance Meter with LCD Display on Arduino UNO

Using the the HR-SR04 module techrm has discovered a way to measure distance and displaying it on a LCD 16x2 display. The maximum range of HR-SR04 is 4 meters, and the shortest measurable distance is 2cm with an accuracy of 3mm.

ultrasonic measure

You will need:
Arduino UNO
USB cable
The Arduino IDE installed on your PC
Set of Dupont cables
MB-102 breadboard
An HC-SR04 ultrasonic sensor
LCD 16x2 display
10k Ohm linear potentiometer
2N3904 transistor (or a 2N2222)
Number 2 10k Ohm resistor (1/4 Watt)
Piezoelectric buzzer

Follow the complete project at; http://www.instructables.com/id/Ultrasonic-distance-meter-with-LCD-display-on-Ardu/?ALLSTEPS