DS18B20 Waterproof Temperature Probe - 3m
$5.99 NZD
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$5.99 NZD
DS18B20 Waterproof Temperature Probe - 3m
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Urban $40
Rural $60
The DS18B20 is a waterproof digital temperature probe with a 3 metre cable and bare wire ends. It uses the Dallas 1-Wire protocol for accurate temperature readings over a single data line, making it ideal for Arduino, ESP32, Raspberry Pi, Home Assistant, and outdoor sensing projects.
- Waterproof stainless steel temperature probe
- 3 metre cable for longer sensor placement
- Digital 1-Wire output using a single data pin
- Works with 3.3V and 5V microcontrollers
- Great for liquid, outdoor, soil, freezer, and brewing projects
Quick Start
1
Connect power
Connect red to 3.3V or 5V, and black to GND.
2
Connect data
Connect yellow to any digital I/O pin on your microcontroller.
3
Add pull-up resistor
Use a 4.7kΩ resistor between VCC and DATA for reliable 1-Wire operation.
4
Install library
For Arduino, install the OneWire and DallasTemperature libraries.
Please note: A 4.7kΩ pull-up resistor is required between VCC and DATA. Resistor is not included.
Specifications
Sensor ChipDS18B20
ProtocolDallas / Maxim 1-Wire
Supply Voltage3.0V – 5.5V DC
Temperature Range-50°C to +125°C
Accuracy±0.5°C from -10°C to +85°C
Resolution9–12 bit adjustable
OutputDigital 1-Wire
Cable Length3 metres
Wire EndBare / unterminated
Probe HousingStainless steel
Probe SizeApprox. 6mm × 50mm
WaterproofingFully sealed, suitable for immersion
WiresRed VCC, Yellow DATA, Black GND
Please note: This probe has bare wire ends, so soldering, screw terminals, or another suitable connector method is required.
Getting Started
1
Wire VCC
Red wire → 3.3V or 5V.
2
Wire DATA
Yellow wire → any digital I/O pin.
3
Wire GND
Black wire → GND.
4
Add 4.7kΩ pull-up resistor
Connect one 4.7kΩ resistor between VCC and DATA.
5
Install libraries
For Arduino IDE, install OneWire by Paul Stoffregen and DallasTemperature by Miles Burton.
Wiring: Red → VCC, Yellow → DATA, Black → GND. One 4.7kΩ pull-up resistor is required between VCC and DATA.
What's Included
1×
DS18B20 waterproof temperature probe
3 metre cable with stainless steel probe housing and bare wire ends.
Please note: 4.7kΩ pull-up resistor is not included.
Common Uses
Pond, tank, and aquaponics temperature monitoring
Greenhouse, garden bed, and soil temperature sensing
Chest freezer and cold storage monitoring
Home brewing and fermentation temperature tracking
Underfloor heating and HVAC temperature sensing
Arduino, Raspberry Pi, ESP32, and Home Assistant projects
Please note: The 3m cable makes this probe useful when the sensor needs to be placed away from the controller.
Common Questions
Will the signal degrade over 3 metres?
No, the DS18B20 uses a digital 1-Wire signal. For reliable operation, use the standard 4.7kΩ pull-up resistor between VCC and DATA.
Can I connect multiple sensors to one data pin?
Yes, multiple DS18B20 sensors can share one data line. Each sensor has a unique address. Use one 4.7kΩ pull-up resistor on the data line.
Is the probe waterproof?
Yes, the stainless steel probe is sealed and suitable for immersion. The bare wire end and controller connection should be kept protected from moisture.
Is the 4.7kΩ resistor included?
No, the resistor is not included. A 4.7kΩ pull-up resistor is required for normal 1-Wire operation.
Please note: The probe end is waterproof, but the bare wire/controller end still needs proper protection in wet environments.