Adafruit Si7021 Temperature & Humidity Sensor Breakout Board

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Price:
Sale price A$18.51   Inc. GST
SKU:
ADA3251
1 unit Ships in 24 hours
50 units Ships in 7 to 10 days

It's summer and you're sweating and your hair's all frizzy and all you really want to know is why the weatherman said this morning that today's relative humidity would max out at a perfectly reasonable 42% when it feels more like 77%. Enter the Si7021 Temperature + Humidity Sensor - the best way to prove the weatherman wrong!

This lovely sensor for Silicon labs has ± 3% relative humidity measurements with a range of 0–80% RH, and ±0.4 °C temperature accuracy at a range of -10 to +85 °C. Great for all of your environmental sensing projects. It uses I2C for data transfer so it works with a wide range of microcontrollers.

To get you going fast, we spun up a custom made PCB in the STEMMA QT form factor, making them easy to interface with. The STEMMA QT connectors on either side are compatible with the SparkFun Qwiic I2C connectors. This allows you to make solderless connections between your development board and the LIS331s or to chain them with a wide range of other sensors and accessories using a compatible cable. QT Cable is not included, but we have a variety in the shop.

We’ve of course broken out all the pins to standard headers and added a voltage regulator and level shifting so allow you to use it with either 3.3V or 5V systems such as the Raspberry Pi + Feather series or Arduino Uno respectively.

There's a PTFE filter to keep the sensor clean, that's the white flat thing on top. Also comes with some pin header. Some light soldering is required to attach the header for use in a breadboard but it's easy to do.

Check out our awesome tutorial for how to use it with Arduino or CircuitPython



Technical Details

Datasheets, schematics, EagleCAD files, Fritzing object and more in the tutorial!

Revision History:

  • As of August 25, 2020 we've updated this sensor to be STEMMA QT compatible - that means there's now an easy way to plug-and-play this sensor without any soldering! The physical shape has changed a little, but the pinout is identical.

Product Dimensions: 17.8mm x 15.3mm x 3.0mm / 0.7" x 0.6" x 0.1"

Product Weight: 1.0g / 0.0oz

    RoHS 2 2011 65 EU Compliant
    RoHS 2 2015 863 EU Compliant


    Learn

    Get the current ambient temperature and humidity
    I2C addresses from 0x00 to 0x7F (inclusive)
    Keep an "eye" on things that are best stored at a specific temperature and/or relative humidity.
    Learn all about home automation by building a cardboard smart-house, controlling its lights, and monitoring temperature!
    SEE ALL GUIDES

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