Interfacing DS18B20 1-Wire Digital Temperature Sensor with Arduino

The DS18B20 digital temperature sensor communicates using Maxim's proprietary 1-Wire protocol, which requires only a single data line alongside ground and power to transmit information to the Arduino Uno. Because the 1-Wire bus relies on open-drain communication, a 4.7k ohm pull-up resistor is connected between the data line and the 5V power supply to ensure the signal line rests at a defined HIGH state when no device is actively pulling it LOW. The sensor features a unique 64-bit serial code etched during manufacturing, which allows multiple DS18B20 sensors to share the exact same single data wire while remaining individually addressable by the Arduino. Using the OneWire library, the Arduino initiates communication by sending reset pulses and address commands over the data line. The DallasTemperature library then abstracts these low-level timing requirements into straightforward functions that command the sensor to perform an internal temperature conversion, wait for the conversion to complete, and finally read the digital temperature data register directly from the device. This digital output eliminates the need for analog-to-digital converter calibration, providing accurate temperature readings straight from the sensor.