Posted 10 March 2019 by Yassine1 Comment Non classé

Interfacing DS18b20 Temperature sensor with Arduino + LCD to measure in Celsius and Fahrenheit

Hello, and welcome to this quick tutorial where I use the digital temperature sensor DS18B20 with an Arduino Board, I’m using the UNO board. The DS18b20 can output the temperature in 9 bit up to 12 bit signal, the DS18B20 communicates over a 1-Wire bus and has a unique 64bits serial code, you can use a lot to create a network using the same wire.

Sensor features (Datasheet):

Unique 1-Wire® Interface Requires Only One Port Pin for Communication
Reduce Component Count with Integrated Temperature Sensor and EEPROM
Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
±0.5°C Accuracy from -10°C to +85°C
Programmable Resolution from 9 Bits to 12 Bits
No External Components Required
Parasitic Power Mode Requires Only 2 Pins for Operation (DQ and GND)
Simplifies Distributed Temperature-Sensing Applications with Multidrop Capability
Each Device Has a Unique 64-Bit Serial Code Stored in On-Board ROM
Flexible User-Definable Nonvolatile (NV) Alarm Settings with Alarm Search Command Identifies Devices with Temperatures Outside Programmed Limits

Make sure to check the tutorial video above for more information.

Wiring:

The wiring is pretty simple Vdd/Gnd with 3.3V/Gnd (you can use 5v) and then one wire with a digital pin, LCD uses the i²c bus, therefore the SDA/SCL are wired with A4/A5. And of course the LCD is optional and can be replaced with anything from your choice.

DS18b20 Wired with Arduino Uno board and LCD i2c

Libraries:

The libraries I’ve used are:

DS18b20 library: Download here from Github or Download Here.
OneWire library: Download here from Github or Download Here.
LCD i²c library: Download here.

Codes:

The codes I’ve used are 3, Download codes here or check below:

Code 1:

the first one is just a simple test to show the temperature in Celsius or Fahrenheit on the Serial monitor, just comment or uncomment the necessary lines.

/* This code is to use with DS18b20 Temperature sensor
* It shows the temperature in °C or °F on the serial monitor
*/

#include <OneWire.h>
#include <DS18B20.h>

OneWire oneWire(2);
DS18B20 sensor(&oneWire);

float f;

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


void loop(void)
{
sensor.requestTemperatures();
while (!sensor.isConversionComplete());
Serial.print("Temperature:");
Serial.print("\t");
// Serial.print(sensor.getTempC()); //Uncomment these lines to print in °C
// Serial.println(" °C");

f=(sensor.getTempC() * 1.8) + 32; //°F Comment these three lines if you don't want °F
Serial.print(f);
Serial.println(" °F");
delay(1000);
}

/* This code is to use with DS18b20 Temperature sensor

* It shows the temperature in °C or °F on the serial monitor

#include <OneWire.h>

#include <DS18B20.h>

OneWire oneWire(2);

DS18B20 sensor(&oneWire);

float f;

void setup(void)

{

Serial.begin(9600);

sensor.begin();

}

void loop(void)

{

sensor.requestTemperatures();

while (!sensor.isConversionComplete());

Serial.print("Temperature:");

Serial.print("\t");

// Serial.print(sensor.getTempC()); //Uncomment these lines to print in °C

// Serial.println(" °C");

f=(sensor.getTempC() * 1.8) + 32; //°F Comment these three lines if you don't want °F

Serial.print(f);

Serial.println(" °F");

delay(1000);

}

Code 2:

the second one shows the temperature on the serial monitor but this time using different sensor format 9-12 bits.

/* This code is to use with DS18b20 temperature sensor
* It shows the temperature in different bit formats
*/

#include <OneWire.h>
#include <DS18B20.h>

OneWire oneWire(2);
DS18B20 sensor(&oneWire);

float f;

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


void loop(void)
{
for(int r=9 ; r<13 ; r++){
sensor.setResolution(r);
sensor.requestTemperatures();
while (!sensor.isConversionComplete());
Serial.print("Temperature:");
Serial.print("\t");
Serial.print(sensor.getTempC());
Serial.print(" °C");

// f=(sensor.getTempC() * 1.8) + 32;
// Serial.print(f);
// Serial.print(" °F");

Serial.print("\t");
Serial.println(r);
}
Serial.println();
delay(2000);
}

/* This code is to use with DS18b20 temperature sensor

* It shows the temperature in different bit formats

#include <OneWire.h>

#include <DS18B20.h>

OneWire oneWire(2);

DS18B20 sensor(&oneWire);

float f;

void setup(void)

{

Serial.begin(9600);

sensor.begin();

}

void loop(void)

{

for(int r=9 ; r<13 ; r++){

sensor.setResolution(r);

sensor.requestTemperatures();

while (!sensor.isConversionComplete());

Serial.print("Temperature:");

Serial.print("\t");

Serial.print(sensor.getTempC());

Serial.print(" °C");

// f=(sensor.getTempC() * 1.8) + 32;

// Serial.print(f);

// Serial.print(" °F");

Serial.print("\t");

Serial.println(r);

}

Serial.println();

delay(2000);

}

Code 3:

and the last one concerns the LCD i²c screen, and here you have your thermometer easy peasy as always.

/* This code is to use with DS18b20 temperature sensor and LCD i²c screen
* It shows the temperature in °C or °F on the LCD screen
* Refer to www.SurtrTech.com for more information
*/

#include <OneWire.h>
#include <DS18B20.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR 0x27 //I2C adress, you should use the code to scan the adress first (0x27) here
#define BACKLIGHT_PIN 3 // Declaring LCD Pins
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7

LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
OneWire oneWire(2);
DS18B20 sensor(&oneWire);

float f;

void setup(void)
{

sensor.begin();
lcd.begin (16,2);
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH); //Lighting backlight
lcd.home ();
}


void loop(void)
{
sensor.requestTemperatures();
while (!sensor.isConversionComplete());
lcd.print(" Temperature:");
lcd.setCursor(6,1);
// lcd.print(sensor.getTempC(),1);
// lcd.setCursor(11,1);
// lcd.print("C");

f=(sensor.getTempC() * 1.8) + 32;
lcd.print(f,1);
lcd.setCursor(11,1);
lcd.print("F");
delay(1000);
lcd.clear();

}

/* This code is to use with DS18b20 temperature sensor and LCD i²c screen

* It shows the temperature in °C or °F on the LCD screen

* Refer to http://www.SurtrTech.com for more information

#include <OneWire.h>

#include <DS18B20.h>

#include <LiquidCrystal_I2C.h>

#define I2C_ADDR 0x27 //I2C adress, you should use the code to scan the adress first (0x27) here

#define BACKLIGHT_PIN 3 // Declaring LCD Pins

#define En_pin 2

#define Rw_pin 1

#define Rs_pin 0

#define D4_pin 4

#define D5_pin 5

#define D6_pin 6

#define D7_pin 7

LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

OneWire oneWire(2);

DS18B20 sensor(&oneWire);

float f;

void setup(void)

{

sensor.begin();

lcd.begin (16,2);

lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);

lcd.setBacklight(HIGH); //Lighting backlight

lcd.home ();

}

void loop(void)

{

sensor.requestTemperatures();

while (!sensor.isConversionComplete());

lcd.print(" Temperature:");

lcd.setCursor(6,1);

// lcd.print(sensor.getTempC(),1);

// lcd.setCursor(11,1);

// lcd.print("C");

f=(sensor.getTempC() * 1.8) + 32;

lcd.print(f,1);

lcd.setCursor(11,1);

lcd.print("F");

delay(1000);

lcd.clear();

}

Yassine View All

Automation and Electrical Engineer, Electronics amateur trying to share my little projects.

Interfacing DS18b20 Temperature sensor with Arduino + LCD to measure in Celsius and Fahrenheit

Sensor features (Datasheet):

Wiring:

Libraries:

Codes:

Code 1:

Code 2:

Code 3:

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Sensor features (Datasheet):

Wiring:

Libraries:

Codes:

Code 1:

Code 2:

Code 3:

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Like this:

Related

Yassine View All

One thought on “Interfacing DS18b20 Temperature sensor with Arduino + LCD to measure in Celsius and Fahrenheit” Leave a comment ›

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