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Lesson 18: Temperature Sensor Module (DS18B20)

In this lesson, you will learn how to read temperature data from a DS18B20 temperature sensor module using an ESP32 Development Board. We’ll use the DallasTemperature library to interface with the sensor and display temperature readings in both Celsius and Fahrenheit units on the Serial Monitor.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
ESP32 & Development Board (ESP32 Board)	BUY
Temperature Sensor Module (DS18B20)	-
Breadboard	BUY

Wiring

Code

Note

To install the library, use the Arduino Library Manager and search for “DallasTemperature” and install it.

Code Analysis

1. Library inclusion

   The inclusion of the OneWire and DallasTemperature libraries allows communication with the DS18B20 sensor.

   Note

   To install the library, use the Arduino Library Manager and search for “DallasTemperature” and install it.

   #include <OneWire.h>
   #include <DallasTemperature.h>
   

2. Defining the sensor data pin

   The DS18B20 is connected to digital pin 25 of the Arduino.

   #define ONE_WIRE_BUS 25
   

3. Initializing the sensor

   The OneWire instance and DallasTemperature object are created and initialized.

   OneWire oneWire(ONE_WIRE_BUS);
   DallasTemperature sensors(&oneWire);
   

4. Setup function

   The setup() function initializes the sensor and sets up serial communication.

   void setup(void)
   {
      sensors.begin();       // Start up the library
      Serial.begin(9600);
   }
   

5. Main loop

   In the loop() function, the program requests temperature readings and prints them in both Celsius and Fahrenheit.

   void loop(void)
   {
      sensors.requestTemperatures();
      Serial.print("Temperature: ");
      Serial.print(sensors.getTempCByIndex(0));
      Serial.print("℃ | ");
      Serial.print((sensors.getTempCByIndex(0) * 9.0) / 5.0 + 32.0);
      Serial.println("℉");
      delay(500);
   }