When you need to measure temperature, the DS18B20 is a firm favourite. Easy to code and with an abundance of examples on the internet, it's a go-to temperature sensor!

This particular sensor is a pre-wired, waterproof version with a DS18B20-compatible sensor in the tip - great for measuring the temperature of liquids, or simply something further away from your microcontroller. These are a digital sensor, so you don't have to worry about signal issues over longer distances.

Now available in ~1m and ~3m lengths.

As the coating/exterior is made of PVC, we suggest limiting the submerged liquid temperature to 100°C to stay on the safe side. Don't use it in salt water or other corrosive liquids. Not IP rated or guaranteed for long-term/high-pressure usage.

These sensors are quite precise (±0.5°C usually and can give up to 12 bits of precision from the onboard digital-to-analogue converter.

They use the Dallas 1-Wire protocol, so data is transferred over a single IO pin, and they're suitable with 3-5V systems. Want something simpler than 1-wire? Maybe try the TMP36 instead.

A 4.7K resistor is included to use as a pull-up for fitting between the VCC and data pin. We toss in a 4.7k resistor, which is required as a pull-up from the DATA to VCC line. For Arduino-compatible devices, you can get started using the Dallas Temperature Control Arduino library which also requires the OneWire Library.

Specifications