DHT11 & DHT22 Sensors Temperature and Humidity Tutorial using Arduino

In this Arduino Tutorial we will learn how to use the DHT11 or the DHT22 sensor for measuring temperature and humidity with the Arduino board.

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[ruitfsilva]

Thanks,
You have by far the best Arduino tutorial projects.

[waleedishaq]

I am running the same code but getting an error of No such file or directory . Can you please help me with that thanks.

[pademo]

I know most of the previous comments are 2 years old or more but I just started and like all the others it was very clear and easy to follow. Thanks for a great tutorial.

[justovelarde]

Hi, congratulations on your video. But I get the error that "the dht.h library is missing. There are several libraries, I don't know which one to install. In my Arduino the dht sensor library is installed, but it doesn't work with this library. Any suggestions? Thanks.

[jorgefantin]

Excellent! You provide a vital service to the Arduino community. Keep up with the good work!

[dtn]

The DHT22 sensor enables temperature measurement in the range of -40 to 80°Celsius
Does your program accept this? I.e it also shows negative temperatures?

[Messerwerkstatt]

the dht11 works fine without a pullup resistor...thanks for this super tutorial.

[albertanasoul]

I am brand new to arduino, can you hook this and a MQ9 up to a single arduino uno? Thanks for this video.

[emresagr]

if i change the delay to lower than 2000 ms, is error occure? or it gives the earlier calculation.

[Presso]

can we design with an Arduino to read 2 Max6675 temperature and send the data to the computer?

[u]

This video is excellent. Educational, clear, and concise, and interesting. Thank you so much! I wish could subscribe 100 times

[misharains]

Where do I download the library for my DHT22?

[mateuszk]

Can you tell me exactly which library to download?
DHT only? Or the Adafruit-sensor-master as well?


sketch_oct30b:14:1: error: 'dht' does not name a type

dht DHT;

[roystervi]

hi, if you don't use the resistor what will happen, I have mines setup with a 10k but the temp is off 10 degrees. do you have any idea why I am off so much degrees? I am using the DHT22 with 3.3V. also can this be power by only by 3.3v or it can be power by 5v?

[talespimentel]

My DHT22 started measuring wrong humidity. It was supposed to be around 60% (as used to be) and now a 4%. I am new to electronics, is that a way to fix it?

[grahamevans]

I can see others seem to have had the error ‘ dht ‘does not name a type, but no solution seems to appear, does anyone have an answer please ?

[donprefontaine]

I could not get the DHT11 single wire protocol to work with a 20x4 I2C display. The display works fine with just a display sketch, and the DHT11 works fine with just a DHT11 sketch, but the two could not be carefully combined to work together. Using the serial monitor display as well as the LCD display simultaneously, I can see the sensor working properly but there is no change whatsoever to the LCD - nothing displays. I suspect that with the on-board pull-up resistor pulling the DHT11 high and ready for communication, it may have been preventing I2C from starting up. I don't know. Ideas?

[mri]

Can I use this sensor on the industry level?

[amityungerman]

Dejan thanks for your stuff it is clearly and understandable as always! I would like to ask if you know how can l schedule two dht22 to take their measure every 2 sec, l mean to synchronized the measures at the same time (cause l need to calculate a gradient )?

[cylurian]

@dejan Nedelkovski Do you know if the DHT11's readings of the humidity and temperature can be float variable and give an accurate value, just like the DHT22 you showed in the video?

thx