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Adafruit HTU21D-F Temperature & Humidity Sensor Breakout Board [ADA1899]

3.6 out of 5 stars 16 ratings
$17.94
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Product Description

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 52% when it feels more like 77%. Enter the HTU21D-F Temperature + Humidity Sensor - the best way to prove the weatherman wrong!

This I2C digital humidity sensor is an accurate and intelligent alternative to the much simpler Humidity and Temperature Sensor - SHT15 Breakout It has a typical accuracy of ±2% with an operating range that's optimized from 5% to 95% RH. Operation outside this range is still possible - just the accuracy might drop a bit. The temperature output has an accuracy of ±1°C from -30~90°C. If you're looking to measure temperature more accurately, we recommend the MCP9808 High Accuracy I2C Temperature Sensor Breakout Board.

Such a lovely chip - so we spun up a breakout board that includes the Filtered version (the white bit of plastic which is a PTFE filter to keep the sensor clean), a 3.3V regulator and I2C level shifting circuitry. This lets you use it safely with any kind of microcontroller with 3.3V-5V power or logic. Each order comes with one fully assembled and tested PCB breakout and a small piece of header. You'll need to solder the header onto the PCB but it's fairly easy and takes only a few minutes even for a beginner.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.76 x 4.72 x 0.2 inches; 0.32 ounces
  • Item model number ‏ : ‎ 100442
  • Date First Available ‏ : ‎ August 27, 2015
  • Manufacturer ‏ : ‎ Adafruit
  • ASIN ‏ : ‎ B00OKJFLWO
  • Customer Reviews:
    3.6 out of 5 stars 16 ratings

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Adafruit HTU21D-F Temperature & Humidity Sensor Breakout Board [ADA1899]

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Customer reviews

3.6 out of 5 stars
16 global ratings

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Not accurate, "JUST A TOY"!
1 out of 5 stars
Not accurate, "JUST A TOY"!
I Have 43 years of Instrumentation & Control technician and this is a JOKE! Temperature is okay RH % way far from being accurate.
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Top reviews from the United States

  • The Goat
    5.0 out of 5 stars Works great!
    Reviewed in the United States on August 10, 2017
    Verified Purchase
    I am new to the world of Arduino, so at this point much of my coding has been modifying code that I download....gets me going and I have learned a lot. With that, I bought this and did just the same, but the only code I found was for displaying on a serial output screen on my laptop.... so I worked in code for a small 1" display and a traditional 16x2 shield.... took a bit of work on my part, but in the end I am able to display on either unit.

    It updates fast... I have a buffer of about 1000ms to keep the 2-point decimal from changing too rapidly...and now it is legible. It appears to be fairly accurate and what I wanted it for was to monitor the temperature and humidity in my basement and I am very happy with the results.
    Helpful
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  • Robert
    3.0 out of 5 stars Works but received the older version instead of the new one displayed in the pictures
    Reviewed in the United States on September 29, 2021
    Verified Purchase
    I expected to get the STEMMA QT current version of this board that is shown in the pictures and not the old header-only version. Pics shouldn't show the new one if they aren't shipping that one.
    2 people found this helpful
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  • Giovanni rosa
    1.0 out of 5 stars Not accurate, "JUST A TOY"!
    Reviewed in the United States on May 12, 2024
    Verified Purchase
    I Have 43 years of Instrumentation & Control technician and this is a JOKE!
    Temperature is okay RH % way far from being accurate.
    Customer image
    Giovanni rosa
    1.0 out of 5 stars
    Not accurate, "JUST A TOY"!

    Reviewed in the United States on May 12, 2024
    I Have 43 years of Instrumentation & Control technician and this is a JOKE!
    Temperature is okay RH % way far from being accurate.
    Images in this review
    Customer imageCustomer imageCustomer imageCustomer image
    2 people found this helpful
    Helpful
     Report
  • SimpleUser
    5.0 out of 5 stars I now send my humidor stats to the web every hour.
    Reviewed in the United States on March 16, 2016
    Verified Purchase
    Works great and it was easy to configure on the Arduino. Go to the Adafruit website, get the library and you can have it running in just a few minutes. I now send my humidor stats to the web every hour.
    2 people found this helpful
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  • Francisco S.
    5.0 out of 5 stars Five Stars
    Reviewed in the United States on December 3, 2016
    Verified Purchase
    Best temperature sensor I have ever used, and Adafruit is an absolutely fantastic company to purchase from.
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  • Ghost
    5.0 out of 5 stars Five Stars
    Reviewed in the United States on October 6, 2016
    Verified Purchase
    Works as expected, using in a home automation project with controlled by an altmega328.
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Top reviews from other countries

  • Sal
    5.0 out of 5 stars Perfect to use with a Raspberry Pi
    Reviewed in the United Kingdom on January 28, 2018
    Verified Purchase
    Adafruit is a well-known name among the electronic aficionados and this sensor is up to the expectations.
    I've used it with one of my Raspberry to monitor temp and humidity. It's simply perfect.
    I highly recommend seller and item!
    Report
  • Andrew
    4.0 out of 5 stars Don't use 5V on this little guy
    Reviewed in Canada on July 20, 2023
    Verified Purchase
    This is a lovely sensor, does its job well. As long as you don't overvolt it so much that it fries the internals. I ran this at 5V for almost 3 months and it worked well until I started getting errors after 1 minute of up time. Don't overvolt it and you should be good.
    Report
  • D. A. Robinson
    3.0 out of 5 stars Non geeks, steer clear of this device
    Reviewed in the United Kingdom on May 6, 2016
    Verified Purchase
    I purchased this sensor, along with the BMP180, to form the basis of a Raspberry Pi weather monitor. I would love to have given this well designed and built module a 5 star rating BUT what a thoughtless design drop off on the pin out of the connector. The Data & Clock connections are swapped over between this sensor break out board and the BMP180. So instead of being able to solder both devices onto a bit of Strip (Vero) board - job done. I now need to make a hand wired correction. Not a big job, but should have been unnecessary.

    Update
    I am afraid I have had to derate this product from 4 to 3 stars. The primary reason is the software needed to get the board working is a real headache. The standard I2C driver that the manuals tell you about won't work with this particular device, Took me several days before I found a method of getting the data out of it. I had to search the web for a clue, then copy some code that didn't mean a thing to me, which thank goodness worked, so I can now use the device. So if you are either a nooby, or someone simply trying to measure humidity without any claim to geekdom, don't buy this device. If on the other hand you are well acquainted with delving into the IO control registers of the ARM, then it is brilliant and probably deserves 5 stars
    Report