How to use HTU21D and HTU21DF Humidity and Temperature Sensor with Arduino

Learn how to use HTU21D-F Humidity and temperature sensor with code and demonstration
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00:00 Introduction
01:45 Hardware explained
03:45 Wiring explained
04:33 Code Explained (basic code)
09:04 Demonstration of basic code
10:04 Custom Code explained
13:04 Demonstration of custom code
Download code and resources for this video: robojax.com/L/?id=274
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Tutorial by Ahmad Shamshiri form Canada
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[@HelmutHassfurther]

my aliexpress HTU21D has a deviation of 2 ° at 24.5 ° C (reports 26.7 ° C) compared to my exact DS18B20
both without activated pullups and with activated ones

[@robojax]

in that case correction is needed.

[@HelmutHassfurther]

Do you know the difference between HTU21DF and HTU21D? at aliexpress i only find the HTU21D. HTU21D-F is from Adafruit and HTU21D an chineese version with less features?

[@robojax]

the F refers to filter which this one doesn't have. However code is the same it is just physical filter that makes it different. The one I shown has no "F". I have updated the page where the code is the created image explaining that. See the links.

[@7skies246]

How could i use this sensor (HTU21D) with an Attiny85 board? The i2c scanner for attiny doesn't recognize the sensor...

[@robojax]

Here use this for I2C scanner for digispark: th-cam.com/video/4HWkUrehXbY/w-d-xo.html and I have shown how to use I2C display: th-cam.com/video/U95hw-ec6nY/w-d-xo.html learn and use it. good luck.

[@OMARSANCHEZ-cm4mf]

How would be the programming using two HTU21D sensors?

[@robojax]

Hi, I just wrote code to use 2 more of HTU21D sensor the link is in the description and here for you robojax.com/L/?id=274 for I2C, you need to take wires from A4 and A5 and share it with both sensors. I will try to put an image if I can.

[@johanjoju3801]

How yo interface this sensor with pic microcontroller

[@robojax]

Hopefully someone will replay. I have no experience that PIC. (yet)

[@fatimamgaedeh4082]

Can I have four of HTU21D sensors at same time with one Mega Arduino?

[@robojax]

Yes you can. You may learn it from different item but principles is the same th-cam.com/video/L6ekl2ABcuY/w-d-xo.html

[@adamwalter2573]

Is it really so good module that I paid for it $14 or was it overpriced ?
Is there a simple python/C code I can use without adafruit sh...t ?

[@robojax]

get the datasheet and write your own code.

[@deleted8961]

Download link not working

[@robojax]

we are sorry, today we are migrating to a new system and many links are dead. I've just fixed this link. try it and if you faced problem, try it later today or tomorrow. We do our best to fix this issue.

[@bollie9752]

lol minus 6% humidity. But the device is impressively low power and accurate. Except for the humidity calculation...

[@robojax]

Yes. If I used absolute value, then we didn't know if it was actual 6% or some incorrect value.