HTU21D Humidity Sensor Hookup Guide
This Tutorial is Retired!
The HTU21D has been retired from the SparkFun catalog. We recommend looking at the Si7021 which is a drop in replacement for the HTU21D.
View the updated tutorial: Si7021 Humidity and Temperature Sensor Hookup Guide
Contributors:
Nate
Nate 
Resources and Going Further
You should now have a good idea of how to add humidity and temperature sensing into your next project. Need some inspiration? Check out these other tutorials:
- Make an automated terrarium that manages heat and humidity levels.
- Build a humidor control box that maintains a constant humidity in a controlled space.
Resources:
- Example Arduino Sketch demonstrating how to talk to the HTU21D Humidity Sensor
- HTU21D Datasheet
- HTU21D Breakout Board Schematic
- HTU21D Breakout Board Eagle Files
- Github repo containing all the latest files and code