DS18B20 Waterproof Digital Temperature Sensor Probe Stainless Steel Tube 1-Wire Thermometer with 1m Cable for Arduino Raspberry Pi ESP32 HVAC Aquariums Incubators

Overview

This DS18B20 waterproof temperature sensor probe is a practical solution for measuring temperature in wet or harsh environments where a bare PCB sensor is not suitable. The sensing element is integrated into a stainless-steel tube and connected via a 1m cable, making it easy to place the probe at the measurement point while keeping your controller safely inside an enclosure. The DS18B20 communicates using the 1-Wire protocol, allowing reliable digital temperature readings with minimal wiring and strong noise immunity compared to analog thermistors in many DIY builds.

Technical Details

The DS18B20 is a digital thermometer IC that converts temperature to a digital value and transmits it over a 1-Wire bus. Each sensor contains a unique 64-bit serial code (ROM), which allows multiple probes to share the same data line while still being individually addressable. This is especially useful for multi-point monitoring such as aquarium + ambient, inlet + outlet, or multiple zones in an incubator.

1-Wire typically uses an open-drain data line that requires a pull-up resistor to the logic supply (commonly 4.7kΩ, but the correct value depends on cable length, bus topology, and the number of devices). The sensor can be powered in standard 3-wire mode (VDD, GND, DQ) or in parasite power mode (2-wire), depending on your design and the specific probe wiring. For longer cables or electrically noisy environments (motors, relays, long runs), 3-wire power is generally more robust.

The stainless-steel probe format is commonly used for immersion and surface contact measurements. Response time depends on probe construction, thermal coupling, and the medium being measured (air vs liquid). Waterproof performance depends on sealing method and manufacturing variation; for critical applications, verify sealing and consider additional strain relief or potting at the cable entry.

Specifications

• Sensor type: DS18B20 (digital thermometer IC; exact manufacturer may vary by batch—check markings/datasheet if critical)
• Interface: 1-Wire digital bus
• Probe housing: Stainless-steel tube (diameter/length varies by supplier revision)
• Cable length: 1m / 100cm (as provided)
• Wiring: Typically 3-core cable (commonly VDD, GND, DATA; color codes vary—confirm before connecting)
• Supply voltage: Varies by DS18B20 variant; commonly supports 3.0V–5.5V (check datasheet for your exact device)
• Temperature range/accuracy/resolution: Depends on DS18B20 specification and configuration (check datasheet and library settings)
• Pull-up resistor: Required on DATA line; value depends on bus conditions (commonly 4.7kΩ as a starting point)

Applications

• Aquariums and terrariums: Water temperature monitoring and controller feedback
• Incubators and fermentation: Stable digital sensing for control loops and logging
• HVAC and ducts: Air temperature measurement with remote probe placement
• Hydroponics and water tanks: Reservoir monitoring and alarms
• DIY thermostats and IoT: ESP32/ESP8266/Raspberry Pi temperature telemetry
• Multi-point sensing: Several DS18B20 probes on one bus for zone monitoring

Integration Notes

• Confirm wire colors with a multimeter before powering (color conventions vary by supplier).
• Add a pull-up resistor from DATA to VDD; start with 4.7kΩ and adjust if you have long cables or many sensors.
• Keep wiring away from high-current lines; if needed, use twisted pair for DATA/GND and add decoupling near the controller.
• For multi-sensor setups, use the 64-bit ROM ID to address each probe; most libraries can scan and list device addresses.
• If using parasite power mode, ensure your controller/library supports strong pull-up during temperature conversion; otherwise use 3-wire power for best reliability.

Included Components

1x DS18B20 waterproof temperature sensor probe with 1m cable