DS18B20 Waterproof Digital Temperature Sensor Probe — 1-Wire, Stainless Steel, Arduino

DS18B20 Waterproof Digital Temperature Sensor Probe — 1-Wire, Stainless Steel

The DS18B20 waterproof temperature probe uses the Dallas 1-Wire protocol to deliver accurate digital temperature readings from -55°C to 125°C with ±0.5°C accuracy. The stainless steel probe housing makes it suitable for liquid immersion, soil burial, and outdoor use where a bare sensor would be damaged. Multiple DS18B20 sensors can share a single data wire — each sensor has a unique 64-bit address, allowing up to 127 sensors on one Arduino pin.

Sensor Specifications

• Sensor IC: Dallas DS18B20
• Protocol: 1-Wire (single data wire + power + ground)
• Temperature Range: -55°C to +125°C
• Accuracy: ±0.5°C (from -10°C to +85°C)
• Resolution: 9–12-bit (configurable, 0.0625°C at 12-bit)
• Supply Voltage: 3.0V – 5.5V
• Probe Housing: Stainless steel — waterproof and corrosion-resistant
• Cable Length: ~1m (3-wire: red=VCC, black=GND, yellow=Data)
• Unique ID: 64-bit ROM code — multiple sensors on one wire

Arduino Wiring

• Red → 5V | Black → GND | Yellow → Arduino digital pin (e.g., D2)
• Add 4.7kΩ pull-up resistor between Data and VCC
• Use OneWire + DallasTemperature libraries from Arduino Library Manager

Multiple Sensors on One Wire

• Connect multiple probes to the same data pin (all share one 4.7kΩ pull-up)
• Each sensor has a unique 64-bit address — read individually in software
• Up to 127 sensors on a single Arduino digital pin

Typical Applications

• Aquarium temperature monitoring
• Pool and spa temperature control
• Soil temperature for greenhouse automation
• Pipe and liquid temperature monitoring
• Outdoor weather station temperature probe
• Sous vide and fermentation temperature control

DS18B20 stainless steel waterproof probe — 1-Wire, ±0.5°C accuracy, -55°C to 125°C, multiple sensors on one wire for Arduino liquid and soil temperature monitoring.