Building a Temperature and Humidity Monitoring System With STM32F1

The STM32F1 series microcontrollers from STMicroelectronics offer a wide range of features and peripherals, making them suitable for various applications. In this project, we'll guide you through building a temperature and humidity monitoring system using the STM32F1 microcontroller, which can be used for environmental monitoring in homes, offices, or industrial settings.

1. STM32F1 Series Microcontroller Board (e.g., STM32F103C8T6, more ICs can check on Xecor)
2. DHT11 or DHT22 Temperature and Humidity Sensor
3. LCD Display (16x2 or similar)
4. Breadboard and Jumper Wires
5. 10kΩ Potentiometer (for LCD contrast adjustment)
6. Power Supply (5V)

• Connect the data pin of the DHT11/DHT22 sensor to a GPIO pin of the STM32F1 microcontroller.

• Connect the VCC and GND pins of the LCD display to the 5V and GND pins of the STM32F1, respectively.
• Connect the RS, RW, and E pins of the LCD display to GPIO pins of the STM32F1 for control.
• Connect the D4-D7 pins of the LCD display to GPIO pins of the STM32F1 for data.

• Connect one end of the potentiometer to 5V, the other end to GND, and the middle pin to the VO pin of the LCD display.

• Power the STM32F1 and the components with a 5V power supply.

Write a program for the STM32F1 microcontroller to read data from the DHT11/DHT22 sensor and display the temperature and humidity readings on the LCD display. Use the STM32CubeIDE or STM32CubeMX software to develop and compile the code.

Upload the program to the STM32F1 microcontroller and power up the circuit. Verify that the temperature and humidity readings are displayed correctly on the LCD display. You can also add features such as data logging or remote monitoring using communication interfaces like UART or Ethernet.

Conclusion

Building a temperature and humidity monitoring system with the STM32F1 microcontroller demonstrates its versatility and capabilities in embedded system applications. This project can be expanded to include more sensors or functionalities, making it suitable for various environmental monitoring applications.