Skip to main content

Temperature and Humidity Detection Device

Introduction​

Welcome to the class on making a temperature and humidity detection device! This project uses a micro:bit board, OLED display, and temperature-humidity sensor connected via the IIC interface of the Petal Base Expansion Board to achieve real-time detection and display of environmental temperature and humidity. Primary and middle school students can make a small instrument that "senses" the weather through simple hardware connection and graphical programming, understanding the changes in temperature and humidity around them.

Teaching Objectives​

  • Understand the role of temperature-humidity sensors and learn to read environmental data.
  • Master the basic usage of OLED displays.
  • Use graphical programming to implement data display logic.

Teaching Preparations​

Before starting the class, please ensure you have prepared the following necessary materials:

ImageNameQuantityRemarks
Smart Home Explorer Kit1
micro:bit1Prepare separately
PC1Prepare separately

These materials will provide you with a complete experience to ensure you can smoothly proceed with subsequent operations and learning. If you have prepared the above, we can continue to the next step.

Course Introduction​

Do you know how hot the classroom is today? Is the humidity at home too dry? The temperature and humidity detection device is like a small "environmental scout" that helps us understand the surrounding temperature and humidity in real time. For example:

  • When turning on the air conditioner in summer, it can tell you if the indoor environment is too dry.
  • When heating in winter, it can remind you if humidification is needed. Let's make it together!

Project Production​

Hardware Connection​

Connect the temperature-humidity sensor and OLED display to the IIC interface of the Petal Base Expansion Board.

Programming Platform​

We usually use the graphical programming platform makecode to program the micro:bit.

Programming platform entry: https://makecode.microbit.org/

Create a New Project​

Open https://makecode.microbit.org/.https://makecode.microbit.org/

Create a new project.

Enter the project name and click Create.

Add Software Libraries​

In the makecode programming interface, click Extensions in the Toolbox.

In the pop-up page, search for petal and click to select the petal software library.

Write the Program​

Example program: https://makecode.microbit.org/_7Wog5ydxPRym

You can also directly download the program through the following web page.

How to Download the Program to micro:bit?​

Connect the PC to the micro:bit V2 using a USB cable.

After a successful connection, a drive named MICROBIT will be recognized on the computer.

Click the icon in the lower left corner，and selectConnect Device。

click。

click。

In the pop-up window, select BBC micro:bit CMSIS-DAP, then select Connect. The micro:bit is now successfully connected.

Click to download the program.

Results​

The OLED display shows two lines of real-time data:

  • First line: Temperature (unit: °C)
  • Second line: Humidity (unit: %)

Extended Knowledge​

Applications of Temperature and Humidity Detection in Daily Life

1. Home Scenarios​

  • Air conditioner/humidifier control: Reminds you to turn on the humidifier when humidity is below 30%; reminds you to turn on the air conditioner when temperature exceeds 28°C.
  • Clothes drying: Prompts "Not suitable for drying clothes today" when humidity is too high.

2. Agriculture/Plant Care​

  • Temperature and humidity monitoring in greenhouses to assist plant growth.
  • Checking humidity before watering home succulents to see if watering is needed.

3. Health Reminders​

  • When humidity is below 20%, the throat is prone to dryness; remember to drink more water.
  • When temperature exceeds 35°C and humidity is high, pay attention to heatstroke prevention and cooling.

4. Creative Extensions​

  • Make a "weather assistant": Display weather icons (such as sun, raindrop) on the micro:bit screen based on temperature and humidity data.
  • Link with a small fan: Automatically start the small fan when temperature exceeds 30°C (requires additional connection of a motor module).