DS18B20 Waterproof Digital Temperature Sensor 1m Cable 1-Wire -55°C to +85°C | Arduino Compatible

DS18B20 Waterproof Digital Temperature Sensor — 1m Cable, Stainless Steel Probe

When you need to measure temperature in wet, submerged, or remote environments, the DS18B20 waterproof temperature sensor is the definitive solution. The Dallas/Maxim DS18B20 IC is sealed inside a stainless steel probe and connected via a 1-meter unterminated cable — ready to be immersed in liquids, buried in soil, or mounted on heatsinks far from your microcontroller. A 4.7kΩ pull-up resistor is included for immediate use.

Specifications

Sensor IC	DS18B20 (Dallas/Maxim)
Communication	1-Wire serial interface
Supply Voltage	3.0V – 5.5V (3.3V and 5V compatible)
Temperature Range	-55°C to +85°C
Accuracy	±0.5°C (-10°C to +85°C)
Resolution	9–12 bit (programmable)
Cable Length	1 meter (approx. 36 inches)
Probe Housing	Stainless steel waterproof can
Cable Termination	Unterminated (bare wire ends)
Manufacturer	Dallas / Maxim

Wire Color Code

Wire Color	Function	Connect To
Red	VDD (Power)	3.3V or 5V
Black	GND (Ground)	Arduino GND
Yellow	DQ (1-Wire Data)	Any Arduino digital pin

Arduino Quick-Start

1. Connect Red to 5V, Black to GND, Yellow to digital pin 4.
2. Connect the included 4.7kΩ pull-up resistor between the Yellow (data) wire and Red (VCC).
3. Install OneWire and DallasTemperature libraries via Arduino IDE Library Manager.
4. Upload the example sketch and open Serial Monitor at 9600 baud to read temperature.

Tip: If the sensor reads -127°C, check that the 4.7kΩ pull-up resistor is correctly installed between data and VCC.

Why Choose This Waterproof Sensor?

• ✅ Waterproof stainless steel probe — safe for liquid immersion in water, aquariums, pools, and pipes
• ✅ 1-meter cable — remote sensing up to 1m from your MCU without signal degradation
• ✅ Digital 1-Wire output — immune to electrical noise, unlike analog sensors on long cable runs
• ✅ Multiple sensors on one bus — chain multiple DS18B20 probes on a single digital pin
• ✅ 3.3V and 5V compatible — works with Arduino, ESP8266, ESP32, Raspberry Pi, STM32
• ✅ Pull-up resistor included — everything needed for immediate use
• ✅ Parasitic power mode — can operate on just 2 wires (GND + data) for simplified wiring

Common Applications

• Aquarium and fish tank water temperature monitoring
• Swimming pool and hot tub temperature sensing
• Soil temperature measurement for agriculture and gardening
• Water heater and boiler temperature control
• Heatsink and PCB thermal monitoring
• Outdoor weather station temperature probes
• Sous vide cooking temperature control
• Pipe freeze detection systems

Frequently Asked Questions

Q: Can I extend the cable beyond 1 meter?
A: Yes. The 1-Wire bus supports cable runs of several meters. For longer runs (>5m), use a stronger pull-up resistor (2.2kΩ) and ensure good cable shielding to prevent noise pickup.

Q: Can I connect multiple DS18B20 sensors to one Arduino pin?
A: Yes. Each DS18B20 has a unique 64-bit address, allowing multiple sensors on a single 1-Wire bus. Use the DallasTemperature library to address each sensor individually.

Q: Is this truly waterproof for permanent submersion?
A: The stainless steel probe is water-resistant and suitable for most liquid applications. For long-term submersion in harsh chemicals or high-pressure environments, additional sealing may be required.

Package Contents

• 1× DS18B20 Waterproof Temperature Sensor (1m cable, stainless steel probe)
• 1× 4.7kΩ Pull-up Resistor

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