Waterproof DS18B20 Digital temperature sensor + extras
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.
This part includes a 4.7k resistor, which is required as a pull-up from the DATA to VCC line when using the sensor. We 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.
Not for use in salt water or other corrosive environments.
- 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
For the BBC micro:bit:
This sensor works with drag'n'drop blocks in makecode.com
Go to Extensions in the editor menu and search for:
The connections are:
- Yellow connects to micro:bit pin0
- Blue connects to micro:bit GND
- Red connects to micro:bit 3V
- The 4.7k resistor must connect between yellow and red
As with all temperature sensors, calibrate against another temperature source and add an offset to get the correct temperature.