DS18B20 Temperature Sensor using NodeMCU

This tutorial of Robo India explains, how to use DS18B20 Temperature Sensor with NodeMCU.

1. Introduction:

This module is used to measure temperature. DS18B20 are one wire bus protocol, which requires only one data line for communication with NodeMCU.

1.1 Features:

1. Measures temperature from -55 degree C to 125 Degree C.

2. 0.5°C Accuracy from -10°C to +85°C

3. Programmable Resolution from 9 Bits to 12 Bits

4. No external components required.

5. Unique one wire interface which requires only one port for communication.

2. Hardware required

S.No.	Item	Quantity
1.	NodeMCU	1
2.	Breadboard	1
3.	DS18B20 Temperature Sensor	1
4.	Resistor 4.7K	1
5.	Male to male Jumper	3

3. Circuit Diagram

Make the following connections with Arduino-

4. Library File

Following library will be required to run this sketch. Download the zip file extract the same and copy this to your Arduino library folder.

This library file should be placed at the install folder of Arduino. I have a 64 bit Win7 OS and my Arduino library folder address is located at

C:\Program Files (x86)\Arduino\libraries 

You may download OneWire library file from here.

You may download DallasTemperature library file from here.

5. Programming

You may download this Arduino Sketch from here.

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

#define ONE_WIRE_BUS 4                          //D2 pin of nodemcu

OneWire oneWire(ONE_WIRE_BUS);
 
DallasTemperature sensors(&oneWire);            // Pass the oneWire reference to Dallas Temperature.

void setup(void)
{
  Serial.begin(9600); 
  sensors.begin();
}

void loop(void)
{ 
  sensors.requestTemperatures();                // Send the command to get temperatures  
  Serial.println("Temperature is: ");
  Serial.println(sensors.getTempCByIndex(0));   // Why "byIndex"? You can have more than one IC on the same bus. 0 refers to the first IC on the wire
  delay(500);
}

6. Output

If you have any query please write us at support@roboindia.com

Thanks and Regards
Content Development Team 
Robo India
https://roboindia.com