Raspberry Pi - Temperature Sensor - OLED
This tutorial instructs you how to use Raspberry Pi to acquire the temperature from a DS18B20 one-wire sensor and then display it on an OLED.
Hardware Preparation
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables.
Additionally, some of these links are for products from our own brand, DIYables.
Overview of OLED and DS18B20 Temperature Sensor
If you are not familiar with OLED and DS18B20 Temperature Sensor (including pinout, functioning, programming, etc.), the following tutorials can help you:
Wiring Diagram
This image is created using Fritzing. Click to enlarge image
We recommend buying a DS18B20 sensor along with its accompanying wiring adapter for a seamless setup. This adapter includes an integrated resistor, removing the need for an additional resistor in the wiring.
Raspberry Pi Code - Temperature from DS18B20 Temperature Sensor and display it on OLED
Detailed Instructions
- Make sure you have Raspbian or any other Raspberry Pi compatible operating system installed on your Pi.
- Make sure your Raspberry Pi is connected to the same local network as your PC.
- Make sure your Raspberry Pi is connected to the internet if you need to install some libraries.
- If this is the first time you use Raspberry Pi, See how to set up the Raspberry Pi
- Connect your PC to the Raspberry Pi via SSH using the built-in SSH client on Linux and macOS or PuTTY on Windows. See to how connect your PC to Raspberry Pi via SSH.
- Make sure you have the RPi.GPIO library installed. If not, install it using the following command:
sudo apt-get update
sudo apt-get install python3-rpi.gpio
- Prior to utilizing the DS18B20 temperature sensor with a Raspberry Pi, we need to enable 1-Wire interface on Raspberry Pi. See How to enable 1-Wire interface on Raspberry Pi
- Install the library for DS18B20 temperature sensor by running the following command:
pip install w1thermsensor
- Prior to utilizing the OLED display with a Raspberry Pi, we need to enable I2C interface on Raspberry Pi. See How to enable I2C interface on Raspberry Pi
- Install the OLED library by running the following command:
pip install Adafruit-SSD1306
- Create a Python script file DS18B20_OLED.py and add the following code:
"""
This Raspberry Pi code was developed by newbiely.com
This Raspberry Pi code is made available for public use without any restriction
For comprehensive instructions and wiring diagrams, please visit:
https://newbiely.com/tutorials/raspberry-pi/raspberry-pi-temperature-sensor-oled
"""
import time
from w1thermsensor import W1ThermSensor
import Adafruit_SSD1306
from PIL import Image, ImageDraw, ImageFont
# Set up the DS18B20 sensor
DS18B20 = W1ThermSensor()
# Set up the SSD1306 OLED display
RST = None
OLED = Adafruit_SSD1306.SSD1306_128_64(rst=RST)
OLED.begin()
OLED.clear()
OLED.display()
# Set up fonts and drawing
width = OLED.width
height = OLED.height
image = Image.new('1', (width, height))
draw = ImageDraw.Draw(image)
font = ImageFont.load_default()
while True:
# Read temperature from DS18B20 sensor
temperature = DS18B20.get_temperature()
# Clear the OLED display
draw.rectangle((0, 0, width, height), outline=0, fill=0)
# Display temperature on OLED
draw.text((5, 5), f'Temperature: {temperature:.2f} C', font=font, fill=255)
# Update the OLED display
OLED.image(image)
OLED.display()
# Wait for a moment before reading again
time.sleep(2)
except KeyboardInterrupt:
# Clean up code before exiting the script
OLED.clear()
OLED.display()
print("\nExiting the script.")
- Save the file and run the Python script by executing the following command in the terminal:
python3 DS18B20_OLED.py
The script runs in an infinite loop continuously until you press Ctrl + C in the terminal.
- Position the sensor over hot and cold water, or hold it in your hand.
- Check out the outcome on the OLED display.