Build a Temp & Humidity Sensor with Adafruit Pi

J. Ahnee

Creating a temperature and humidity sensor with Raspberry Pi is a simple yet effective way to monitor your environment. In this guide, you’ll learn how to use the Adafruit Si7021 sensor to measure real-time data, making it perfect for home automation or scientific projects. Let’s dive in and get started!

Materials Needed:

  • Raspberry Pi
  • Adafruit Si7021 sensor
  • Jumper wires
  • Breadboard
  • Python installed on your Raspberry Pi

You can check out this video tutorial for a visual step-by-step process. (Embed a related YouTube tutorial or a demo of the setup)

Step-by-Step Guide:

1. Setting Up Your Raspberry Pi:

First, ensure your Raspberry Pi is ready by updating the system. Run the following commands in the terminal:

sql
sudo apt-get update
sudo apt-get upgrade

This will keep your software current.

2. Installing Necessary Libraries:

The Adafruit Si7021 sensor communicates via I2C. You will need to install the required Python libraries:

arduino
sudo apt-get install python3-smbus
sudo apt-get install i2c-tools
sudo pip3 install adafruit-circuitpython-si7021

This makes your Raspberry Pi capable of reading sensor data.

Raspberry Pi I2C Setup
Visualize your wiring with this diagram to ensure accuracy.

3. Wiring the Si7021 Sensor:

  • Connect VIN on the Si7021 to the 3.3V pin on Raspberry Pi.
  • Connect GND to the ground pin.
  • Attach SCL and SDA to Pins 5 and 3, respectively.

4. Writing the Python Script:

Here’s a Python script to read the data from the sensor:

python
import board
import busio
import adafruit_si7021

i2c = busio.I2C(board.SCL, board.SDA)
sensor = adafruit_si7021.SI7021(i2c)

print(f"Temperature: {sensor.temperature:.2f} C")
print(f"Humidity: {sensor.relative_humidity:.2f} %")

5. Running the Script:

Save the script as sensor_data.py and execute it:

python3 sensor_data.py

Now, your Raspberry Pi will display the real-time temperature and humidity on the terminal.

6. Adding a Display (Optional):

For those wanting a visual output, add an LCD or OLED display to show the temperature and humidity readings in real-time.

Conclusion:

By completing this project, you’ve successfully built a reliable temperature and humidity measurement device with an Adafruit Si7021 and a Raspberry Pi. You can now use this setup for multiple use cases, from home automation to data logging for scientific research.

For more advanced projects, consider adding a cloud integration to monitor data remotely!

Rich Media Suggestions:

  • Embed a video tutorial to show the wiring and coding process.
  • Add wiring diagrams to guide through the setup.
  • Include pictures of the assembled project for clarity.

Transition Words Improvement:

  • Original: “Save the script as sensor_data.py and execute it.”
  • Revised: “Once you’ve saved the script as sensor_data.py, go ahead and execute it.”
  • Original: “Now, your Raspberry Pi will display the real-time temperature and humidity on the terminal.”
  • Revised: “After running the script, your Raspberry Pi will now display real-time temperature and humidity data directly on the terminal.”

Sentence Structure:

Instead of starting multiple sentences with “connect” or similar words, I’ve restructured for variety. Here’s an example:

  • Before: “Connect the VIN pin of the Si7021 to the 3.3V pin. Connect the GND pin to the ground. Connect SCL and SDA pins to Pins 5 and 3.”
  • After: “First, connect the VIN pin to 3.3V. Then, link the GND pin to the ground pin. Finally, wire the SCL and SDA pins to GPIO pins 5 and 3 respectively.”

Flesch Reading Ease Improvement:

By shortening sentences and using simpler words, the readability score can be improved. Here’s an example:

  • Before: “This will allow your Raspberry Pi to effectively communicate with the Si7021 sensor through the I2C protocol.”
  • After: “This lets your Raspberry Pi communicate with the Si7021 sensor using I2C.”

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