ESP32 - Ultrasonic Sensor - LCD

Hardware Required

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×LCD I2C
1×Ultrasonic Sensor
n×Jumper Wires
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About Ultrasonic Sensor and LCD

If you do not have knowledge of Ultrasonic sensor and LCD (pinout, how they work, how to connect them to ESP32, how to program for them...), learn about them in the following tutorials:

Wiring Diagram

ESP32 Ultrasonic Sensor LCD Wiring Diagram

Image is developed using Fritzing. Click to enlarge image

ESP32 Code

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-ultrasonic-sensor-lcd */ #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x3F, 16, 2); // I2C address 0x3F, 16 column and 2 rows const int TRIG_PIN = 26; // ESP32 pin GIOP26 connected to Ultrasonic Sensor's TRIG pin const int ECHO_PIN = 25; // ESP32 pin GIOP25 connected to Ultrasonic Sensor's ECHO pin float duration_us, distance_cm; void setup() { lcd.init(); // initialize the lcd lcd.backlight(); // open the backlight pinMode(TRIG_PIN, OUTPUT); // config trigger pin to output mode pinMode(ECHO_PIN, INPUT); // config echo pin to input mode } void loop() { // generate 10-microsecond pulse to TRIG pin digitalWrite(TRIG_PIN, HIGH); delayMicroseconds(10); digitalWrite(TRIG_PIN, LOW); // measure duration of pulse from ECHO pin duration_us = pulseIn(ECHO_PIN, 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

On Arduino IDE, Go to Tools Manage Libraries

ESP32 add library
  • Search “LiquidCrystal I2C”, then find the LiquidCrystal_I2C library by Frank de Brabander
  • Click Install button to install LiquidCrystal_I2C library.
  • ESP32 LiquidCrystal I2C library
  • Copy the above code and paste it to Arduino IDE
  • Click Upload button on Arduino IDE to compile and upload code to ESP32 board
  • Arduino IDE Upload Code
  • Put the sensor on hot and cold water, or grasp the sensor by your hand
  • See the result in LCD
  • ESP32 Ultrasonic LCD Wiring Diagram

    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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