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Adafruit Temperature and Humidity Sensor Breakout Board - HTU21D-F


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About this product


  • An easy to set up sensor for your environment and surroundings
  • Works perfectly with data logging components
  • Easily communicate with this device over i2c

Product overview

  • An easy to set up sensor for your environment and surroundings
  • Works perfectly with data logging components
  • Easily communicate with this device over i2c
  • Requires soldering
  • 3.3 - 5V Vin and Logic
  • Tutorials, pinouts, wiring, and other files available here

Why pick an Adafruit temperature/humidity sensor?
If you’re looking to make greenhouse project or to check the temperature of a room, this is the component for you. You can accurately detect and log even small changes using additional components, or simply get a serial readout using a computer-running Arduino IDE. An on-board PTFE filter aids in keeping the sensor clean without compromising results.

What is the temperature/humidity sensor compatible with?
This sensor uses I2C to communicate with an Arduino or other microcontroller. The I2C interface is compatible with the Uno, Mega 2560, Leonardo and Due Arduino boards. The I2C interface allows for the connection of multiple devices on the same two communication lines – which enables you to have up to eight displays working simultaneously.

What library do I need for my Arduino?
You will need Adafruit’s library, available here to programme your Arduino board and control this altimeter with temperature/humidity sensor.
Tutorials, pinouts, wiring, and other files available here


Dimensions & Weight









Product Specifications


Open source

Pin Outs:


Operating Specifications




Package Contents:

1x Adafruit temperature and humidity sensor breakout board
1x 5-pin header


Warranty Type:





Assembly Required:


Soldering Required:


Hello, Please could you let me know what the I2c address of this device is. Thanks.

Asked by: Andy
The I2C address is 0x40 ... it cannot be changed. The links to the information you need are provided on the product overview page, but they are not clearly visible, I'm going to ask if they can be highlighted in another colour. The word "here" appears twice in the very last paragraph (What library do I need for my Arduino?) On both occasions it has an embedded link to important information pages The first usage links to Adafruits driver page for the device https://github.com/adafruit/Adafruit_HTU21DF_Library the second contains a web link to tutorials, pinouts, wiring, and other files https://learn.adafruit.com/adafruit-htu21d-f-temperature-humidity-sensor/overview The data regarding the address of the device can be found by clicking the "pinouts" link https://learn.adafruit.com/adafruit-htu21d-f-temperature-humidity-sensor/pinouts
Answered by: Les
Date published: 2017-11-29

We would like to use this in e-textile. Is it suitable for sewing or welding to garments?

Asked by: hatie
Yes this will work fine in your intended application. As long as any liquid does not come into contact with the item .
Answered by: Darren
Date published: 2016-08-11
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