SENSORS/ACTUATORS

Arduino Nano 33 IoT - Temperature Sensor - LCD

This guide shows you how to use the Arduino Nano 33 IoT to get the temperature from a DS18B20 sensor and display it on a 16x2 LCD I2C screen.

Hardware Preparation

1	×	Arduino Nano 33 IoT
1	×	Micro USB Cable
1	×	LCD I2C
1	×	DS18B20 Temperature Sensor (WITH Adapter)
1	×	DS18B20 Temperature Sensor (WITHOUT Adapter)
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 .

Buy Note: Many DS18B20 sensors available in the market are unreliable. We strongly recommend buying the sensor from the DIYables brand using the link provided above. We tested it, and it worked reliably.

Overview of Temperature Sensor and LCD

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

These tutorials explain how Temperature 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 Temperature 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-temperature-sensor-lcd */ #include <OneWire.h> #include <DallasTemperature.h> #include <LiquidCrystal_I2C.h> #define SENSOR_PIN 2 // The Arduino Nano 33 IoT pin connected to DS18B20 sensor's DQ pin OneWire oneWire(SENSOR_PIN); DallasTemperature DS18B20(&oneWire); LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows float tempC; // temperature in Celsius float tempF; // temperature in Fahrenheit void setup() { DS18B20.begin(); // initialize the sensor lcd.init(); // initialize the lcd lcd.backlight(); // open the backlight } void loop() { DS18B20.requestTemperatures(); // send the command to get temperatures tempC = DS18B20.getTempCByIndex(0); // read temperature in Celsius tempF = tempC * 9 / 5 + 32; // convert Celsius to Fahrenheit lcd.clear(); lcd.setCursor(0, 0); // display position lcd.print(tempC); // display the temperature in Celsius lcd.print((char)223); // display ° character lcd.print("C"); lcd.setCursor(0, 1); // display position lcd.print(tempF); // display the temperature in Fahrenheit lcd.print((char)223); // display ° character lcd.print("F"); delay(500); }

※ NOTE THAT:

The LCD's I2C address may change with different makers. In our code, we used the address 0x27, which is given by the DIYables manufacturer.

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.
Type DallasTemperature into the search box, and then find the DallasTemperature library by Miles Burton.
Click the Install button to add the DallasTemperature library.

Arduino Nano 33 IoT Dallas Temperature library

The system will ask you to add a required part. Click the Install All button to add the OneWire library.

Type LiquidCrystal I2C in the search box, then find the LiquidCrystal_I2C library made 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 in the Arduino IDE to compile the code and send it to your Arduino Nano 33 IoT board.
Change the sensor's temperature by holding the DS18B20 temperature sensor in your hand or placing it in warm or cold water.
View the results on the LCD.

If your LCD screen stays blank, check out Troubleshooting on LCD I2C at https://arduinogetstarted.com/tutorials/arduino-lcd-i2c#content_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 notes in the code!

Video Tutorial

Learn More

※ OUR MESSAGES

As freelancers, We are AVAILABLE for HIRE. See how to outsource your project to us
Please feel free to share the link of this tutorial. However, Please do not use our content on any other websites. We invested a lot of effort and time to create the content, please respect our work!