Product Description
The Waterproof DS18B20 Temperature Probe is a digital thermal sensor encased in a high-quality stainless steel tube, making it perfect for measuring temperatures in wet or harsh environments. Unlike thermistors that output an analog voltage, the DS18B20 communicates digitally using the 1-Wire protocol, which means it is highly resistant to signal degradation over long cables. At Robogears, this is our go-to sensor for water tank monitoring, brewing systems, soil temperature measurement, and laboratory incubation setups where the sensor must be submerged.
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Key Highlights
Digital 1-Wire Interface: Requires only one digital pin for communication. Multiple DS18B20 sensors can be connected to the same wire, as each sensor has a unique 64-bit serial code.
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Sealed & Waterproof: The stainless steel probe head is 6mm in diameter and 50mm long, specifically designed to protect the internal electronics from moisture and corrosion.
High Resolution: The resolution is user-programmable from 9 to 12 bits ($0.5^\circ\text{C}$ to $0.0625^\circ\text{C}$), allowing for extremely fine temperature tracking.
No External Components Required: All the sensing and digital conversion happens inside the probe head, eliminating the need for external ADC circuits.
Wide Compatibility: Works seamlessly with 3V to 5V logic levels, making it compatible with Arduino, Raspberry Pi, and ESP32.
Technical Specifications
Supply Voltage: 3.0V to 5.5V DC
Query Time: < 750ms (at 12-bit resolution)
Cable Wiring: Red (VCC), Black (GND), Yellow (DATA)
Probe Dimensions: 6mm diameter x 50mm length
Cable Type: Flexible PVC Jacket
Installation Tip from Robogears
To get this sensor working, you must use a 4.7k $\Omega$ pull-up resistor between the Data (Yellow) wire and the VCC (Red) wire. Without this resistor, the microcontroller will not be able to pull the data line high, and you will get a "-127" reading. For software, we recommend the DallasTemperature and OneWire libraries. While the probe itself is waterproof, the junction where the cable meets the probe and the bare wire ends are not; if you plan to submerge the probe deeply, we suggest adding a piece of heat-shrink tubing at the cable entry point for extra security.
Note: This product is the DS18B20 Waterproof Probe ONLY. A 4.7k Ohm resistor is typically required but not included. Product images are for illustration purposes only.
