DS18B20 Temperature Sensor Features
The DS18B20 is a temperature sensor that can measure temperature in the range of -55°C to + 125°C with an accuracy of 0.5 ° C. The output accuracy of this sensor is adjustable from 9 to 12 bits which is set to 12 bits by default.
The communication protocol of the this sensor is single-wire, and to measure the ambient temperature you only need to connect one wire to Arduino.
Note
One of the biggest advantages of this sensor is its one-wire communication protocol. In this protocol, each sensor has a unique 64-bit code. With this feature, you will be able to connect the output of several DS18B20 sensors to a common Arduino pin (or other processor).
There are 2 types of this sensor.
You can download the DS18B20 module datasheet here.
DS18B20 Temperature Sensor Pinout
this sensor has 3 pins:
- VCC: Module power supply – 5 V
- GND: Ground
- DQ: Sensor Output
You can see Pinout of this sensor in the following image.
Required Material
Hardware Components
Software Apps
Interfacing DS18B20 Temperature Sensor with Arduino
Step 1: Circuit
Connect the sensor to the Arduino according to the following image. You can connect the sensor output to any of the Arduino ADC pins.
Both sensors are connected to the Arduino in the same way.
Step 2: Installing Library
Go to Library manager and install the DS18B20 temperature sensor library.
Tip
In addition to the sensor library, you also need the OneWire library. If you are using newer versions of the Arduino IDE software, after installing the DS18B20 library, installing the OneWire library will be suggested to you automatically, otherwise install this library yourself.
Step 3: Code
Upload the following code to the Arduino board. This code displays the read temperature in the serial monitor.
/*
DS18B20 Temperature Sensor
modified on 08 Sep 2020
by Mohammad Reza Akbari @ Electropeak
Home
*/
#include <OneWire.h>
#include <DallasTemperature.h>
// Connect Sensor output to pin2
#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
/*
The setup function. We only start the sensors here
*/
void setup(void)
{
Serial.begin(9600);
sensors.begin();
}
void loop(void)
{
sensors.requestTemperatures(); // Send the command to get temperatures
float temp = sensors.getTempCByIndex(0);
// Check if reading was successful
if (temp != DEVICE_DISCONNECTED_C)
{
Serial.print("Temperature of Sensor 0 is: ");
Serial.println(temp);
}
else
{
Serial.println("Error to reading data");
}
}
The code output should look like this:
