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);
}
Quick Steps
- Connect Arduino to PC via USB cable
- Open Arduino IDE, select the right board and port
On Arduino IDE, Go to Tool 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
If LCD displays nothing, see Troubleshooting on LCD I2C
Code Explanation
Read the line-by-line explanation in comment lines of source code!
Video Tutorial
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See Also
Comments
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