The DS18B20 Temperature Sensor Probe is a highly popular, waterproof, 1-Wire digital thermometer encapsulated in a stainless steel casing. It is widely used in DIY electronics, industrial process monitoring, automation, and environmental tracking.Core Technical SpecificationsThe sensor is engineered by Maxim Integrated (now Analog Devices) and offers robust performance in harsh or wet environments:

• Communication Protocol: Uses the unique Dallas 1-Wire interface, requiring only one digital data pin and ground to communicate with a microprocessor.
• Measurement Range: Extends from -55C to +125C (-67F to +257F).
• Accuracy: Delivers 0.5C precision within the most common range of -10C to +85C.
• Power Supply: Operates between 3.0V and 5.5V. It supports “parasite power mode,” which allows it to derive operational power directly from the data line.
• Resolution: Selectable from 9-bit to 12-bit configurations (corresponding to steps of 0.5C down to 0.0625C).
• Unique Addressing: Each individual sensor possesses a factory-burned, unique 64-bit serial code. This enables you to daisy-chain dozens of probes in parallel onto a single microcontroller pin.

Standard Pinout & WiringThe pre-wired probe style usually breaks out into three distinct leads:

• Red Wire: VCC / Power Supply (3.0V 5.5V)
• Black Wire: GND / Ground
• Yellow (or White) Wire: DATA line

Important Circuit Requirement: To ensure reliable data transmission on a 1-Wire bus, a 4.7k pull-up resistor must be connected between the DATA (Yellow/White) and VCC (Red) lines. Without this pull-up resistor, the microcontroller will not read any data.

Platform CompatibilityThe DS18B20 is fully compatible with almost all modern prototyping microcontrollers and single-board computers:

• Arduino: Managed smoothly using standard libraries like OneWire.h and DallasTemperature.h.
• Raspberry Pi: Supported natively through its default 1-wire kernel module interfaces.
• ESP32 / ESP8266: Perfect for IoT projects when paired with platforms like ESPHome, Tasmota, or MicroPython.