ESP32 - Temperature Sensor
This tutorial instructs you how to use ESP32 to read the temperature from DS18B20 temperature sensor and print it to Serial Monitor.
Hardware Used In This Tutorial
|ESP-WROOM-32 Dev Module
|USB Cable Type-C
|DS18B20 Temperature Sensor (WITH Adapter)
|DS18B20 Temperature Sensor (WITHOUT Adapter)
|(Optional) DC Power Jack
|(Recommended) ESP32 Screw Terminal Adapter
Or you can buy the following sensor kit:
|DIYables Sensor Kit 30 types, 69 units
Buy Note: Numerous DS18B20 sensors available in the market are of poor quality. We strongly advise purchasing the sensor from the DIYables brand via the link above; we conducted tests, and it performed reliably.
Introduction to One Wire Temperature Sensor - DS18B20
DS18B20 Temperature Sensor Pinout
DS18B20 temperature sensor has three pins:
- GND pin: connect this pin to GND (0V)
- VCC pin: connect this pin to VCC (5V or 3.3V)
- DATA pin: is 1-Wire Data Bus. It should be connected to a digital pin on ESP32.
The DS18B20 sensor has two forms:
- TO-92 package (looks similar to a transistor)
- Waterproof probe. We use this form in this tutorial.
Connecting a DS18B20 temperature sensor with an Arduino often requires a pull-up resistor, which can be a hassle. However, some manufacturers have made the process simpler by offering a wiring adapter with a built-in pull-up resistor and a screw terminal block for easy connection.
Wiring Diagram between DS18B20 Temperature Sensor and ESP32
- With breadboard
If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.
- Wiring diagram with adapter (recommended)
- Real wiring diagram with adapter
For ease of connection, it's advisable to purchase a DS18B20 sensor that comes with a wiring adapter equipped with a built-in resistor, eliminating the need for an additional resistor in the wiring.
- If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
- Do the wiring as above image.
- Connect the ESP32 board to your PC via a micro USB cable
- Open Arduino IDE on your PC.
- Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
- Click to the Libraries icon on the left bar of the Arduino IDE.
- Search “DallasTemperature” on the search box, then look for the DallasTemperature library by Miles Burton.
- Click Install button to install DallasTemperature library.
- You will be asked to install the dependency. Click Install All button to install OneWire library.
- Copy the above code and paste it to Arduino IDE.
- Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
- Make the sensor hotter or colder by gripping the DS18B20 temerature sensor on your hand, or embedding it on hot and cold water.
- See the result on Serial Monitor. It looks like the below:.
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