SENSORS/ACTUATORS

Arduino Nano 33 IoT - Ultrasonic Sensor - LCD

This guide shows you how to use the Arduino Nano 33 IoT board to measure distance and display it on an LCD screen with an ultrasonic sensor.

Hardware Preparation

1	×	Arduino Nano 33 IoT
1	×	Micro USB Cable
1	×	LCD I2C
1	×	Ultrasonic Sensor
1	×	Breadboard
1	×	Jumper Wires
1	×	Optionally, DC Power Jack
1	×	Recommended: Screw Terminal Expansion Board for Arduino Nano
1	×	Recommended: Breakout Expansion Board for Arduino Nano
1	×	Recommended: Power Splitter for Arduino Nano

Or you can buy the following sensor kits:

1	×	DIYables Sensor Kit (30 sensors/displays)
1	×	DIYables Sensor Kit (18 sensors/displays)

Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables .

Overview of Ultrasonic Sensor and LCD

If you're new to using the Ultrasonic Sensor, LCD, and Arduino Nano 33 IoT, please check out these tutorials:

These tutorials explain how Ultrasonic Sensor and LCD work, their pinouts, how to connect them to the Arduino Nano 33 IoT, and how to program Arduino Nano 33 IoT to work with the Ultrasonic Sensor and LCD.

Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino Nano 33 IoT Code

/* * This Arduino Nano 33 IoT code was developed by newbiely.com * * This Arduino Nano 33 IoT code is made available for public use without any restriction * * For comprehensive instructions and wiring diagrams, please visit: * https://newbiely.com/tutorials/arduino-nano-iot/arduino-nano-33-iot-ultrasonic-sensor-lcd */ #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows #define TRIG_PIN 5 // The Arduino Nano 33 IoT pin connected to Ultrasonic Sensor's TRIG pin #define ECHO_PIN 4 // The Arduino Nano 33 IoT pin 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); }

※ NOTE THAT:

The LCD's I2C address may vary based on who made it. In our code, we used the 0x27 address, which is provided by the DIYables company.

Detailed Instructions

If you are new to the Arduino Nano 33 IoT, be sure to check out our Getting Started with Arduino Nano 33 IoT tutorial. Then, follow these steps:

Connect the components to the Arduino Nano 33 IoT board as depicted in the diagram.
Use a USB cable to connect the Arduino Nano 33 IoT board to your computer.
Launch the Arduino IDE on your computer.
Select the Arduino Nano 33 IoT board and choose its corresponding COM port.
Click the Libraries icon on the left side of the Arduino IDE.
In the search box, type LiquidCrystal I2C and then find the LiquidCrystal_I2C library by Frank de Brabander.
Click the Install button to add the LiquidCrystal_I2C library.

Arduino Nano 33 IoT LiquidCrystal I2C library

Copy the code above and paste it into the Arduino IDE.
Click the Upload button to compile and transfer the code to your Arduino Nano 33 IoT board.
Place the sensor in hot water and cold water, or hold it in your hand.
Check the results on the LCD screen.

If the LCD shows nothing, please check the LCD I2C Troubleshooting page: Troubleshooting on LCD I2C

Line-by-line Code Explanation

The Arduino Nano 33 IoT code above has a simple explanation for each line. Please read the comments in the code!

Video Tutorial

Language References

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