SENSORS/ACTUATORS

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

1	×	Raspberry Pi 4 Model B
1	×	SSD1306 I2C OLED Display 128x64
1	×	SSD1306 I2C OLED Display 128x32
1	×	DS18B20 Temperature Sensor (WITH Adapter)
1	×	DS18B20 Temperature Sensor (WITHOUT Adapter)
1	×	4.7 kΩ resistor
1	×	Breadboard
1	×	Jumper Wires
1	×	(Optional) Screw Terminal Block Shield for Raspberry Pi
1	×	(Optional) USB-C Power Cable with On/Off Switch for Raspberry Pi 4B
1	×	(Optional) Plastic Case and Cooling Fan for Raspberry Pi 4B
1	×	(Optional) HDMI Touch Screen Monitor for Raspberry Pi

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.

Buy Note: Many DS18B20 sensors available in the market are unreliable. We strongly recommend buying the sensor from the DIYables brand using the link provided above. We tested it, and it worked reliably.

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

To simplify and organize your wiring setup, we recommend using a Screw Terminal Block Shield for Raspberry Pi. This shield ensures more secure and manageable connections, as shown below:

Raspberry Pi Screw Terminal Block Shield

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.

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