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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 | × | 4.7 kΩ resistor | |
| 1 | × | Breadboard | |
| 4 | × | Jumper Wires |
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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
Image is developed using Fritzing. Click to enlarge image
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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