# Waterproof DS18B20 Digital temperature sensor + extras

**Type:** Product page · **SKU:** ADA381 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/waterproof-ds18b20-digital-temperature-sensor-extras.html ([markdown](https://core-electronics.com.au/waterproof-ds18b20-digital-temperature-sensor-extras.html.md))

This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something far away, or in wet conditions. While the sensor...

## Pricing

- **Price:** $20.60 (inc GST) — $18.73 AUD, exc GST
- **Quantity discounts:** 10+ $18.16 (exc GST) · 50+ $17.79 (exc GST)

## Availability & dispatch

- Out of stock — the product page offers email notification when it returns.

## Description

This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something far away, or in wet conditions. While the sensor is good up to 125°C the cable is jacketed in PVC so they suggest keeping it under 100°C. Because they are digital, you don't get any signal degradation even over long distances! These 1-wire digital temperature sensors are fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter. They work great with any microcontroller using a single digital pin, and you can even connect multiple ones to the same pin, each one has a unique 64-bit ID burned in at the factory to differentiate them. Usable with 3.0-5.0V systems.
 
 The only downside is they use the Dallas 1-Wire protocol, which is somewhat complex, and requires a bunch of code to parse out the communication. If you want something really simple, and you have an analog input pin, the [TMP36 is trivial to get going](https://core-electronics.com.au/tmp36-analog-temperature-sensor-tmp36.html).
 
 Adafruit toss in a 4.7k resistor, which is required as a pullup from the DATA to VCC line when using the sensor. Adafruit don't have a detailed tutorial up yet but you can get started by using the Dallas Temperature Control Arduino library which requires also the OneWire Library.

### Technical Details

Not for use in salt water or other corrosive environments.

Cable specs:

- Stainless steel tube 6mm diameter by 30mm long
- Cable is 36" long / 91cm, 4mm diameter
- Contains DS18B20 temperature sensor
- If your sensor has four wires - Red connects to 3-5V, Black connects to ground and White is data. The copper wire is soldered to the wire shielding
- If your sensor has three wires - Red connects to 3-5V, Blue/Black connects to ground and Yellow/White is data

DS18B20 Technical specs:

- Usable temperature range: -55 to 125°C (-67°F to +257°F)
- 9 to 12 bit selectable resolution
- Uses 1-Wire interface- requires only one digital pin for communication
- Unique 64 bit ID burned into chip
- Multiple sensors can share one pin
- ±0.5°C Accuracy from -10°C to +85°C
- Temperature-limit alarm system
- Query time is less than 750ms
- Usable with 3.0V to 5.5V power/data

Downloads: [DS18B20 Datasheet](https://core-electronics.com.au/attachments/localcontent/DS18B20_26189e7eea8.pdf)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/3/8/381-00.jpg)