Arduino DS18B20 Temperature Sensor for Beginners: Measure Temperature with OneWire
Project Overview
This beginner-friendly project demonstrates how to use the DS18B20 temperature sensor with Arduino to measure and display temperature values in Celsius. The DS18B20 is a digital temperature sensor that communicates using the OneWire protocol, making it easy to interface with Arduino.
Project Goals for DS18B20 Temperature Sensor with Arduino
- Learn how to connect the DS18B20 temperature sensor to Arduino using the OneWire protocol.
- Read temperature values from the DS18B20 sensor and display them in the Serial Monitor.
- Understand how to use the DallasTemperature library for easy integration with the DS18B20 sensor.
Required Components for Arduino DS18B20 Temperature Sensor Project
Here’s a list of components needed to build this project:
| Component | Description | Link |
|---|---|---|
| Arduino Uno | Main microcontroller board | Buy on Amazon |
| DS18B20 Temperature Sensor | Digital temperature sensor | Check Availability |
| 4.7k Ohm Resistor | Pull-up resistor for OneWire communication | Check Availability |
| Jumper Wires | Connects components to Arduino | Buy on Amazon |
| Breadboard | For prototyping connections | Buy on Amazon |
What is the DS18B20 Temperature Sensor?
The DS18B20 temperature sensor is a digital sensor that uses the OneWire protocol for communication. It can measure temperatures from -55°C to +125°C with a high degree of accuracy. The sensor is widely used in projects requiring precise temperature measurements.
DS18B20 Pinout Overview
| Pin | Description |
|---|---|
| VCC | Connects to 5V on Arduino |
| GND | Ground connection, connects to GND on Arduino |
| DQ | Data line, communicates with Arduino via OneWire protocol |
Circuit Connection for DS18B20 Temperature Sensor with Arduino
Follow these connections to set up the DS18B20 temperature sensor with Arduino:
| Component | Arduino Pin | Details |
|---|---|---|
| DS18B20 VCC | 5V | Power the DS18B20 sensor |
| DS18B20 GND | GND | Ground the DS18B20 sensor |
| DS18B20 DQ | Pin 2 | Data line, communicates via OneWire protocol |
| 4.7k Ohm Resistor | Between DQ and VCC | Pull-up resistor for OneWire communication |
How the Circuit Works
The DS18B20 temperature sensor sends temperature data to the Arduino through the OneWire communication protocol. The DallasTemperature library simplifies this communication, making it easy to read temperature values in Celsius and display them on the Serial Monitor.
Arduino Code for DS18B20 Temperature Sensor
This code reads the temperature from the DS18B20 sensor and displays it in the Serial Monitor. Copy and upload this code to your Arduino Uno.
// Include the libraries we need
#include
#include
// Data wire is connected to pin 2 on the Arduino
#define ONE_WIRE_BUS 2
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);
void setup(void) {
// Start the serial port
Serial.begin(9600);
Serial.println("DS18B20 Temperature Sensor with Arduino");
// Start up the Dallas Temperature library
sensors.begin();
}
void loop(void) {
// Request temperatures from the DS18B20 sensor
Serial.print("Requesting temperatures...");
sensors.requestTemperatures(); // Send the command to get temperatures
Serial.println("DONE");
// Get temperature from the first sensor
float tempC = sensors.getTempCByIndex(0);
// Check if reading was successful
if(tempC != DEVICE_DISCONNECTED_C) {
Serial.print("Temperature for device 1 (index 0) is: ");
Serial.println(tempC);
} else {
Serial.println("Error: Could not read temperature data");
}
// Wait for 2 seconds before taking the next reading
delay(2000);
}
Steps to Upload Arduino Code
- Connect your Arduino to the computer using a USB cable.
- Open the Arduino IDE and paste the code into a new sketch.
- Install the OneWire and DallasTemperature libraries from the Library Manager.
- Select the correct board (e.g., Arduino Uno) and port from the "Tools" menu.
- Click the "Upload" button to transfer the code to the Arduino.
Check Output for DS18B20 Temperature Sensor
- Open the Serial Monitor (Ctrl + Shift + M) after uploading the code.
- The temperature values from the DS18B20 sensor will be displayed in the Serial Monitor.
- Verify that the temperature readings are consistent and accurate.
Troubleshooting Tips for DS18B20 Temperature Sensor
- No Temperature Reading: Check the wiring and ensure the pull-up resistor is properly connected between the data line and VCC.
- Error: Could not read temperature data: Ensure the sensor is correctly connected and functioning.
- Incorrect Temperature Values: Confirm that the DS18B20 sensor is receiving 5V power and is not exposed to extreme temperatures during testing.
Suggestions for Beginners
Begin by testing the DS18B20 sensor individually to understand its behavior. Once you’re comfortable with the temperature readings, try integrating it into more complex Arduino projects.
Recommended Book for Learning Arduino
Arduino Programming for Absolute Beginners - This book offers easy, step-by-step instructions and projects, making it ideal for beginners who want to learn Arduino programming.
For more Arduino tutorials, visit MechatronicsLab.net, where you’ll find resources on Arduino, ESP8266, ESP32, and Raspberry Pi.
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