SparkFun
Temperature Sensor - High Temperature, Waterproof (DS18B20)
A sealed, waterproof DS18B20 digital temperature probe for precise measurements in wet or harsh environments. The sensor communicates over a 1-Wire interface...
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A sealed, waterproof DS18B20 digital temperature probe for precise measurements in wet or harsh environments. The sensor communicates over a 1-Wire interface, requiring just one data pin (plus ground) to connect to your microcontroller. It can even be parasitically powered from the data line.
Each DS18B20 has a unique silicon serial number, so multiple probes can share a single 1-Wire bus — ideal for multi-point temperature monitoring in HVAC systems, equipment, and process control.
Specifications
- Sensor – DS18B20 digital temperature sensor
- Input Voltage – 3.0–5.5V
- Temperature Range – -55°C to +125°C
- Accuracy – ±0.5°C (-10°C to +85°C)
- Resolution – Programmable 9 to 12 bits
- Interface – 1-Wire
- Probe Diameter – 7 mm
- Probe Length – ~26 mm
- Overall Length (with wire) – 6 ft (~1.8 m)
- Waterproof – Sealed stainless steel probe
Wiring
- Red – Vcc
- Black – GND
- White – Signal (Data)
Ideal For
- Liquid temperature monitoring (aquariums, brewing, hydroponics)
- HVAC and environmental controls
- Multi-point temperature sensing on a single bus
Package Contents
- 1× Waterproof DS18B20 Temperature Probe
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- 1-Wire
- 1-Wire is a communication method where devices share a single data line, often with each device having its own address. It matters because several temperature modules can be connected to one microcontroller pin instead of needing a separate pin for each probe.
- DS18B20
- The DS18B20 is a common digital temperature sensor, often supplied in a waterproof stainless-steel probe, that sends its readings to a microcontroller over a 1-Wire connection. It is a typical choice for adding temperature data to environmental or water-monitoring projects.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- VCC
- VCC is the positive power-supply connection on a chip or module. Connecting it to the correct supply voltage is needed for the part to power on and helps avoid damaging the electronics.
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Brands
Temperature Sensor DS18B20 Datasheet
Datasheet · 95.5 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 407.2 KB · Click any page to view full size
Related Tutorials
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