Arduino - Temperature Sensor - OLED

In this tutorial, we are going to learn how to read the temperature from DS18B20 one wire sensor and display it on an OLED.

Hardware Required

1	×	Arduino UNO or Genuino UNO
1	×	USB 2.0 cable type A/B
1	×	SSD1306 I2C OLED Display 128x64
1	×	Temperature Sensor DS18B20
1	×	Breadboard
1	×	Jumper Wires
1	×	(Optional) 9V Power Adapter for Arduino
1	×	(Optional) Screw Terminal Block Shield for Arduino Uno

Or you can buy the following sensor kit:

DIYables Sensor Kit 30 types, 69 units

Please note: These are affiliate links. If you buy the components through these links, We may get a commission at no extra cost to you. We appreciate it.

About OLED and DS18B20 Temperature Sensor

If you do not know about OLED and DS18B20 Temperature Sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

This image is created using Fritzing. Click to enlarge image

We suggest purchasing a DS18B20 sensor that comes with a wiring adapter for easy connection. The adapter has a built-in resistor, eliminating the need for a separate one in the wiring.

Arduino Code - Temperature from DS18B20 Temperature Sensor and display it on OLED

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-temperature-sensor-oled */ #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <OneWire.h> #include <DallasTemperature.h> #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 64 // OLED display height, in pixels #define SENSOR_PIN 2 // Arduino pin connected to DS18B20 sensor's DQ pin Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); // create SSD1306 display object connected to I2C OneWire oneWire(SENSOR_PIN); // setup a oneWire instance DallasTemperature tempSensor(&oneWire); // pass oneWire to DallasTemperature library String tempString; void setup() { Serial.begin(9600); // initialize OLED display with address 0x3C for 128x64 if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { Serial.println(F("SSD1306 allocation failed")); while (true); } delay(2000); // wait for initializing oled.clearDisplay(); // clear display oled.setTextSize(2); // text size oled.setTextColor(WHITE); // text color oled.setCursor(0, 10); // position to display tempSensor.begin(); // initialize the sensor tempString.reserve(10); // to avoid fragmenting memory when using String } void loop() { tempSensor.requestTemperatures(); // send the command to get temperatures float tempCelsius = tempSensor.getTempCByIndex(0); // read temperature in Celsius tempString = String(tempCelsius, 2); // two decimal places tempString += "°C"; Serial.println(tempString); // print the temperature in Celsius to Serial Monitor oledDisplayCenter(tempString); } void oledDisplayCenter(String text) { int16_t x1; int16_t y1; uint16_t width; uint16_t height; oled.getTextBounds(text, 0, 0, &x1, &y1, &width, &height); // display on horizontal and vertical center oled.clearDisplay(); // clear display oled.setCursor((SCREEN_WIDTH - width) / 2, (SCREEN_HEIGHT - height) / 2); oled.println(text); // text to display oled.display(); }

Quick Steps

Open Arduino IDE, Go to Tools Manage Libraries

Search “SSD1306”, then find the SSD1306 library by Adafruit
Click Install button to install the library.

You will be asked for intalling some other library dependencies
Click Install All button to install all library dependencies.

Search “OneWire”, then find the OneWire library by Paul Stoffregen
Click Install button to install OneWire library.

Search “Dallas”, then find the DallasTemperature library by Miles Burton.
Click Install button to install DallasTemperature library.

Copy the above code and open with Arduino IDE
Click Upload button on Arduino IDE to upload code to Arduino
Put the sensor on hot and cold water, or grasp the sensor by your hand
See the result on OLED

※ NOTE THAT:

The about code automatically horizontal and vertical center aligns the text on OLED display

Video Tutorial

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