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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 | |
| n | × | Jumper Wires |
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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
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
Image is developed 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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