Arduino - Ultrasonic Sensor - LCD

Hardware Required

1	×	Arduino UNO or Genuino UNO
1	×	USB 2.0 cable type A/B
1	×	LCD I2C
1	×	Ultrasonic Sensor
1	×	Jumper Wires
1	×	(Optional) 9V Power Adapter for Arduino
1	×	(Optional) Screw Terminal Block Shield for Arduino

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About Ultrasonic Sensor and LCD

If you do not know about Ultrasonic sensor and LCD (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Wiring diagram

This image is created using Fritzing. Click to enlarge image

Real wiring

This image is created using Fritzing. Click to enlarge image

Arduino Code

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-ultrasonic-sensor-lcd */ #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x3F, 16, 2); // I2C address 0x3F, 16 column and 2 rows int trigPin = 9; // TRIG pin int echoPin = 8; // ECHO pin float duration_us, distance_cm; void setup() { lcd.init(); // initialize the lcd lcd.backlight(); // open the backlight pinMode(trigPin, OUTPUT); // config trigger pin to output mode pinMode(echoPin, INPUT); // config echo pin to input mode } void loop() { // generate 10-microsecond pulse to TRIG pin digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); // measure duration of pulse from ECHO pin duration_us = pulseIn(echoPin, HIGH); // calculate the distance distance_cm = 0.017 * duration_us; lcd.clear(); lcd.setCursor(0, 0); // start to print at the first row lcd.print("Distance: "); lcd.print(distance_cm); delay(500); }

※ NOTE THAT:

The I2C address of LCD can vary according to the manufacturers. In the code, we used 0x27 that is specified by DIYables manufacturer

Quick Steps

Connect Arduino to PC via USB cable
Open Arduino IDE, select the right board and port

On Arduino IDE, Go to Tools Manage Libraries

Search “LiquidCrystal I2C”, then find the LiquidCrystal_I2C library by Frank de Brabander
Click Install button to install LiquidCrystal_I2C library.

Copy the above code and open with Arduino IDE
Click Upload button on Arduino IDE to upload code to Arduino

Put the sensor on hot and cold water, or grasp the sensor by your hand
See the result in LCD

This image is created using Fritzing. Click to enlarge image

Code Explanation

Read the line-by-line explanation in comment lines of source code!

※ NOTE THAT:

If LCD displays nothing, see Troubleshooting on LCD I2C
The above code is for the learning purpose. The ultrasonic sensor is very sensitive to noise. If you want to use the ultrasonic sensor in practice, you should filter noise for the ultrasonic sensor. See how to filter noise for ultrasonic sensor

Video Tutorial

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The Best Arduino Starter Kit

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Arduino - Ultrasonic Sensor - LCD

Hardware Required

About Ultrasonic Sensor and LCD

Wiring Diagram

Arduino Code

Quick Steps

Code Explanation

Video Tutorial

The Best Arduino Starter Kit

See Also