This design uses the DS18B20 temperature sensor. The DS18B20 is DALLAS 'latest single-line digital temperature sensor, which is smaller in size and has a wider and more applicable voltage. The DS18B20 is the world's first temperature sensor with a "1-wire bus" interface. The unique and economical nature of the single-wire bus allows users to easily configure the sensor network and introduce new concepts for configuring the measurement system. Its measurement temperature range is -55, +125 ° C, and the accuracy is 0.5 ° C in the range of -10, +85 ° C. The field temperature is transmitted directly to the “one-time bus” digitally, greatly improving the system's anti-interference capability. Ideal for on-site temperature measurement in harsh environments such as environmental control, equipment or process control, temperature measuring appliances, etc. The DS18B20 can program 9,12 digit resolution with an accuracy of 0.5 ° C. Smaller packages can be selected, wider voltage coverage resolution settings and user-set alarm temperatures are stored in the E2PROM and continue to be saved after power off. The performance of the DS18B20 is the best in the next generation and the price / performance ratio is also very good. Following the initial product of the "1 line bus", the DS18B20 opens a new concept of temperature sensor technology. The DS18B20 and DS18B22 can choose more voltage, characteristics and packaging to build an economical temperature measurement system suitable for you.