The website focuses on the connection and programming practice between the DS18B20 temperature sensor and the STM32 microcontroller. The DS18B20 is a one-wire waterproof sensor that can measure the temperature of liquids in the range of -55°C to 125°C. It has digital output characteristics, with an accuracy of up to ±0.5°C and can achieve a maximum accuracy of 12 bits through its on-board analog-to-digital converter. Even over long distances, the signal does not attenuate. However, due to its use of the Dallas 1-Wire protocol, communication parsing is relatively complex, and the relevant libraries of Arduino do not support it. Therefore, manual coding is required when connecting to the STM32.
In terms of hardware connection, the tutorial guides readers to connect the 3.3V pin of the DS18B20 to the 3.3V pin of the STM32, the GND pin to the GND pin of the STM32, and its digital pin to PA8 of the STM32. At the same time, a 4.7K resistor is used to connect the digital pin to the VCC line. In software implementation, the website provides a complete code example, including several key functions such as initialization, writing, reading, and temperature reading. The `DS18B20_Init()` is responsible for sensor initialization, the `DS18B20_Write()` is used to write data to the sensor, the `DS18B20_Read()` is used to read data, and the `TempRead()` function realizes the sending of temperature conversion commands, reading of converted values, and accuracy conversion. In the overall program flow, the `setup()` function initializes the serial communication, and the `loop()` function repeatedly calls `TempRead()` to obtain temperature values. After conversion, the values are printed through the serial port, with a 500-millisecond interval between each print. After uploading the code, opening the serial monitor allows users to see the real-time display of the room temperature value. This website provides comprehensive and detailed guidance from theory to practice for readers who want to connect the DS18B20 to the STM32 and obtain temperature data.