Raspberry Pi - Temperature Humidity Sensor - OLED
This tutorial instructs you how to use Raspberry Pi to read the temperature and humidity from a DHT11/DHT22 sensor and display it on an OLED.
Hardware Preparation
| 1 | × | Raspberry Pi 4 Model B | |
| 1 | × | SSD1306 I2C OLED Display 128x64 | |
| 1 | × | DHT11 Temperature and Humidity Sensor | |
| 1 | × | Jumper Wires | |
| 1 | × | (Optional) Screw Terminal Adapter for Raspberry Pi |
You can use DHT22 sensor instead of DHT11 sensor.
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. We appreciate your support.
Overview of OLED display, DHT11 and DHT22 Temperature Humidity Sensor
If you are unfamiliar with OLED display, DHT11 and DHT22 temperature humidity sensor (including pinout, functionality, programming, etc.), the following tutorials can help you out:
- Raspberry Pi - OLED tutorial
Wiring Diagram
Raspberry Pi - DHT11 Module LCD Wiring
This image is created using Fritzing. Click to enlarge image
Raspberry Pi - DHT22 Module LCD Wiring
This image is created using Fritzing. Click to enlarge image
Raspberry Pi Code - DHT11 Sensor - 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 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
- Install the library for DHT11 temperature and humidity sensor by running the following command:
sudo pip3 install Adafruit_DHT
- Create a Python script file dht11_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-humidity-sensor-oled
import Adafruit_DHT
import Adafruit_SSD1306
from PIL import Image, ImageDraw, ImageFont
import time
# Set up the DHT11 sensor
DHT_SENSOR = Adafruit_DHT.DHT11
DHT_PIN = 20 # GPIO pin where the DHT11 sensor is connected
# 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
font = ImageFont.load_default()
while True:
# Read temperature and humidity from DHT11 sensor
humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)
# Clear the OLED display
OLED.clear()
# Display temperature and humidity on OLED
OLED.draw.text((5, 5), f'Temp: {temperature:.1f} C', font=font, fill=255)
OLED.draw.text((5, 20), f'Humidity: {humidity:.1f}%', font=font, fill=255)
# Update the OLED display
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 dht11_oled.py
The script runs in an infinite loop continuously until you press Ctrl + C in the terminal.
- Make the enviroment around the temperature sensor hot, or hold the sensor in your hand.
- Check out the results on the OLED display.
Raspberry Pi Code - DHT22 Sensor - OLED
# 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-humidity-sensor-oled
import Adafruit_DHT
import Adafruit_SSD1306
from PIL import Image, ImageDraw, ImageFont
import time
# Set up the DHT22 sensor
DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 20 # GPIO pin where the DHT22 sensor is connected
# 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
font = ImageFont.load_default()
while True:
# Read temperature and humidity from DHT22 sensor
humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)
# Clear the OLED display
OLED.clear()
# Display temperature and humidity on OLED
OLED.draw.text((5, 5), f'Temp: {temperature:.1f} C', font=font, fill=255)
OLED.draw.text((5, 20), f'Humidity: {humidity:.1f}%', font=font, fill=255)
# Update the OLED display
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.")