DFRobot Gravity DS18B20 Temperature Sensor (Arduino Compatible) - Digital Single-Bus Interface

Connect the module's Gravity 3-pin cable: Red (VCC) to 5V, Black (GND) to GND, and Blue/Yellow (Signal) to any digital pin (e.g., D2). A 4.7kΩ pull-up resistor between the signal and VCC lines is typically integrated on the module, but for long cable runs or parasitic power mode, an external resistor may be required. The 1-Wire library is used for communication.

Yes, the 1-Wire protocol supports daisy-chaining multiple sensors on a single data line. Each DS18B20 has a unique 64-bit ROM address, allowing the microcontroller to query them individually. Ensure the bus has a proper pull-up resistor (4.7kΩ) and consider power limitations if using parasitic mode for many sensors.

In normal mode, the sensor uses three wires: VCC, GND, and Data. In parasitic mode, it draws power from the data line via an internal capacitor, requiring only two wires (Data and GND). Parasitic mode simplifies wiring but has stricter timing and current draw constraints during temperature conversion.

Use Arduino libraries like 'DallasTemperature' and 'OneWire'. Initialize the OneWire bus on your chosen pin, declare a DallasTemperature sensor object, request a temperature reading with `sensors.requestTemperatures()`, and fetch the value for a specific sensor address using `sensors.getTempCByIndex()`. The library handles the 1-Wire communication and conversion.

For reliable 1-Wire communication, keep cable lengths under 50 meters in standard mode with proper shielding. Longer distances increase signal degradation and require lower pull-up resistor values (e.g., 1kΩ) and careful bus design to mitigate noise and capacitance issues.