DS18B20 Digital 1-Wire Temperature Sensor Module for Arduino

Prototyping and Engineering Tips from Robogears

• The Pull-up Resistor: The 1-Wire bus requires a 4.7kΩ pull-up resistor between the DATA pin and VCC. While many modules have this resistor pre-soldered, always check with a multimeter. If your readings are consistently "85°C" or "0°C," a missing or incorrect pull-up resistor is the likely culprit.

• Parasite Power Mode: For very long wire runs or to save wire, you can connect the VCC and GND pins of the sensor together to Ground. The sensor will then "steal" power from the data line during high-logic states. Note that this mode requires slightly more careful timing in your software.

• Resolution vs. Speed: If you need very fast updates, set the resolution to 9-bit (0.5°C increments), which takes only 93.75ms to convert. For high precision, use 12-bit (0.0625°C increments), but be prepared for the 750ms delay per reading.

• Waterproofing: If you intend to measure liquid temperatures (like a fish tank), do not use this PCB module. Instead, look for the waterproof DS18B20 probe version, which houses the sensor in a stainless steel tube with sealed wires.

Package Includes

• 1 x DS18B20 Digital Temperature Sensor Module

Disclaimer

Avoid placing the sensor in direct contact with high-voltage components or corrosive chemicals. Ensure the operating voltage does not exceed 5.5V to prevent internal IC failure.