How to use DHT22 AM3302 Temperature and Humidity sensor with Arduino

[@sconescon6691]

Out of every Arduino tutorial out there, from every site across the board - and I've been to em all (or so it feels like, it's a lot!!) - you are BY FAR, the best at explaining things. Thank you so much and please carry on :))

[@robojax]

You are very welcome. I am please that you found my tutorials helpful. I appreciate sharing my channel with your friends.

[@aminnonplus]

Thanks pal ! Love from France

[@ronnytoro3]

Awesome page ! thanks for all your advices and information that you share!

[@dr_akoto]

THIS IS MY SUCCESSFUL PRACTICAL TUTORIAL...THANKS ROBOJAX

[@robojax]

congratulations.

[@tonysicily2687]

Awesome video, No music Clean video Nice VO Lots of info Thank you, Subscribed, Liked and Saved

[@robojax]

Much appreciated!

[@projardgreen2568]

explain more videos like this, the code in detail, I subscribed because of how detailed explenation was.

[@aminkelate]

Thank you bro, you make my day..

[@robojax]

My pleasure

[@gamestv4875]

Good tutorial.Worked flawlessly. Thanks

[@robojax]

You are welcome.

[@truthseeker7775]

Thank you so much Robojax. What a great video. I wish you had continued on to tell us how to write the code so that the sensor could turn on or turn off a light or motor when the temperature reached or declined to a certain temperature.=====================================================================================

[@robojax]

You are welcome. I will make video on that as well.

[@UpSpider]

Amazing video. Really helpful.

[@robojax]

You are welcome.

[@danmusiceasy]

Great tutorial, very clearly explained! I just made my first air monitor :) Do you have any tutorials on particle sensors and VOC sensors, or plan to do any in the future?

[@robojax]

I am glad you found it useful. This was the first time I heard VOC sensors. I just checked it, very interesting sensor for Air quality. I might make videos in the future. thanks

[@cheikhanoumar9788]

thank you very match

[@robojax]

You are welcome. The best thank you for me is to subscribe to my channel. Thanks

[@alialvi419]

kindly tell me that while you run DHT tester ,your uno borad is connected or not?

[@robojax]

Of course it is connected. I connected to USB but you can connect it ot 6V to 15V power adapter .

[@alnoorratansi9364]

as always I love watching your videos, how do handle negative temp. what changes do you have make in the code ?

[@robojax]

thank you very much. For negative temperature, it should just work fine. No change it needed.

[@michaelmotis3580]

Thank you bro!! good job! it does work for me

[@robojax]

You're welcome!

[@jasperblase1374]

I know this is a bit of late but when I see the humidity readings on your video, it's very low. Is your room dry or just error from the sensor?

[@robojax]

I don’t remember what was the humidity but this sensor is very accurate.

[@fpt380]

Hello . Thank you for your nice video . I have a question: Are the sensors like LM35 and DH11-22 accurate and reliable? Are it need to calibrate? thank you

[@robojax]

You are welcome. I have not compared it with LM35. Because this is digital while LM35 is analogue, this should be much better. No calibration is needed. Datasheet/manual has been provided.

[@fpt380]

Robojax thank you for explain

[@videotronicmaker]

Thank you.

[@robojax]

You are welcome.

[@aniszed3641]

thanck you so much

[@robojax]

You are welcome.

[@patrickduhirwenzivugira4729]

Thank you for the video. Any idea how I can add a wifi module and send the data read as REST API ?

[@robojax]

You are welcome. I would have to make video that. I have no tested code or components in hand.

[@fatimamgaedeh4082]

Hello, great video and tutorial. My question is, when I have to use a resistor? So, if I want to connect 4 dht22 sensors together when I need a resistor?

[@robojax]

Hello Fatima, you don't need resistor if you have the module shown in the video. I have the code on our website robojax.com. I added the link to that page on the same page where you get the code. the link to code page is below this video in the description. good luck.

[@fatimamgaedeh4082]

@@robojax Thank you so much, appreciate your reply.

[@sreejithunnikrishnan8484]

should we connect a resistor of 10k if its an Arduino mega 2560? or jus direct connection

[@robojax]

you made me worry with your question. my videos are totally different. I never leave the details out. if you watch it fully, your project should work. So after watching the "wiring explained" section, I saw that I have shown it. you don't need anything expect the wires.

[@sreejithunnikrishnan8484]

@@robojax Ok thanks

[@mohammednidal5206]

can we code this along with autonomous obstacle avoiding code??

[@robojax]

Yes you can.

[@allan6952]

Thank you very much !! I have a question. Do you know the difference between the Temperature value and the Heat index value ? Which one is more accurate ?

[@robojax]

You are welcome. Please see the details for heat index from National Weather Services of USA: www.weather.gov/ama/heatindex#:~:text=The%20heat%20index%2C%20also%20known,sweat%20to%20cool%20itself%20off.

[@Sidnoi-w5r]

Hello Robojax, Is it possible to have more than one DHT22 in the same project? Thanks

[@robojax]

Yes. I will going to make a video on that but if you watch this video, it should work for you. kzbin.info/www/bejne/mWqTf6awl7N6bsU

[@JohnWick-id6pk]

Hi, thank you for the informative video. What do you think would be the cheapest cable tu use the sensor at 3 meters from Raspberry ? Thanks

[@robojax]

You are welcome. This module doesn't need much power. Any wire will work.

[@JohnWick-id6pk]

Nice ! So just a basic USB wire is fine ? Thanks

[@fauzanfikri4340]

Hi robojax, can i use this sensor and a mega arduino stand alone without connecting it to a pc ?

[@robojax]

when we say Arduino it means stand alone. We use PC to just upload it after that we don't need the PC. yes this module works with any Arduino board. including Arduino Mega. Here is Arduino Step by step course with 100 video and codes Arduino Step by Step course that starts here kzbin.info/www/bejne/Y2fUhKV6iqZol5o

[@jamesdumancas9597]

Hi sir thanks for this helpful video i just wanna ask if the dht 22 can go faster than every 2 seconds loop?

[@robojax]

Because it measure humidity, it makes it to read slowly and you will not get accurate data less than 2sconds. See page 9 robojax.com/learn/arduino/robojax-DHT22_manual.pdf if you just need temperature measurement, then use another sensor and there are a lot other sensors that can read much faster .

[@dtn2529]

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?

[@robojax]

of course it does. if you get incorrect reading, either you have not selected the sensor in the code or there is wiring issue. I am assuming you have followed the instruction and installed the library. You may use the code for DHT22 from this video ignoring the WiFi feature kzbin.info/www/bejne/gImmlKCQitKtr5o

[@dtn2529]

Thank you very much for your reply. It is OK. Otherwise, you have very good, clear and understandable instructions. (Sory,google translation) @@robojax

[@iamrrebel]

Please I would like to know if this temperature sensor can work on poultry farms. Thank you

[@robojax]

Hello, it just senses the temperature and humidity and does not care about environment. Just make sure dirt does not cover it.

[@Fubo777]

Would it be possible to use two of these sensors simultaneously with Arduino?

[@robojax]

Hello, yes you can use the idea from this video kzbin.info/www/bejne/gmfInJ9odqeWq7s to use two or more of this and here is how you can see it temperature from this sensor on mobile phone kzbin.info/www/bejne/Z3KXXmmeeaaFh8U

[@Fubo777]

@@robojax Thank you very much. I'm thinking of making a simple weather station that shows indoor and outdoor humidity and temperature

[@omar_eldewail]

when I connect it says failed to read from the dht sensor

[@robojax]

so check the wiring. if you have another sensors also try different sensor.

[@mohdfarezsamin1493]

Possible to provide the code if a turbidity sensor is used instead of temperature & humidity? my code doesn't seem to work.

[@robojax]

I would have to have the device, then I would be able to say it it works or not. i just add it to my "to do " list.

[@kikoinvents]

tanks bro

[@robojax]

You are welcome.

[@ilhamrahmatmuharam8501]

when i running this program and open serial monitor "Failed to read from DHT sensor!" you have an idea ? i have try with different device but same result

[@robojax]

it means you have either incorrect wiring or dead module.

[@jrsbrothers6724]

if the distance of the sensor is 20 meters with the arduino, can the sensor work?

[@robojax]

I did the search, found the information for you with the link from manufacturer. read the datasheet and id you did not find, it contact the manufacturer. Use ESP32 or ESP8266 to read it over wifi. Search my channel. Here is how to find Specific KZbin Video in a channel bit.ly/findKZbinVideo

[@shecterelectric432]

I have this error when I trie to run it. I t says ´error compling for board Arduino/genuino uno.´ I am using an Arduino uno board with the 1.8.11 version. Do you think you can help me?

[@robojax]

it means you have not selected the right COM Port for your Arduino. when your Arduino is connected click on Tools->Port and select another port and the try to upload.

[@sachinsadhale1789]

Plz name the library to be included there are many dht Libraries

[@robojax]

I have provided the library from original source and from my own with my own code. I mentioned the link in the video and have provided the link under the video description.

[@ezstudio3d]

I getting "Failed to read from DHT sensor!". I am using the dht22 but mine doesn't have the black and adapter and I use a 10k omh resistor to 5v any suggestions ?

[@farenhartman5559]

I get the same thing! Did you get a solution for this problem?

[@ezstudio3d]

I did, I bought one with the little black thing that has the resistor and maybe some thing extra www.amazon.com/gp/product/B01N9BA0O4/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

[@zhouri7758]

Hello Can I take this code and make some changes to work with DHT11

[@robojax]

have you looked at the code? there is DHT11. just comment (select) the right sensor.

[@zhouri7758]

@@robojax no I have not Thanks

[@arjaysibug843]

just the same. 22 is just an upgraded version

[@rianhamman6187]

The DTH22 sensor isn't working with this setup for me, the sensor is pulling to much power from my arduino, any idea why it would (in the exact same setup as the video)

[@robojax]

either your are connecting the wires incorrectly or the sensor is bad. The only way to know is to connect another sensor.

[@ELKopps11]

Mine fails. In troubleshooting if found that "nan" is in temp_hum_val[0] and 0 is in temp_hum_val[1].

[@robojax]

Nan means wiring is incorrect

[@divakarans8015]

Hi, why we had resistor in data pin

[@robojax]

Hi, I have replied to this in one the comments earlier. Please scroll down.

[@scottwaters7286]

Why do I get "Sync timeout"?

[@robojax]

I haven't see it but google search showed this forum.arduino.cc/index.php?topic=91569.0

[@divakarans8015]

Hi, I'm using Dht 22, & I'm receiving *Nan%* errors, pls solve

[@robojax]

bad wiring

[@azwaqar]

i get this error "Error compiling for board Arduino/Genuino Mega or Mega 2560" how to solve it????

[@robojax]

port problem. Try to select the right port.

[@azwaqar]

Thanks for reply the error was due to missing library I download it and error disappear thank you

[@Paul7mac]

@@azwaqar which library i have the same problem

[@mikahjbvf8166]

Hi.. why did i get 'Failed to read from DHT sensor!' ?

[@robojax]

Wiring problem. Check all 3 wires.

[@mikahjbvf8166]

@@robojax ok.. thank you.. i'll try

[@humanfromthefuture4430]

failed to read dht sensor what happenned

[@robojax]

incorrect wiring, bad pin connection or bad modue.

[@stelaririna]

Why does it read that my humidity 99.9% and temperature 129.9°C. And both don’t change no matter what

[@robojax]

It could be wiring problem

[@stelaririna]

@@robojax and if it’s not a wiring problem, what other cause can it be?

[@robojax]

Not sure, perhaps wrong model is selected in code.

[@stelaririna]

@@robojax can the sensor be broken? Cause I checked the wires and the voltage and amps are good, the code is good, I picked the right model, but the reading won’t change no matter what I do

[@robertomalatesta6604]

@@stelaririna na You might try and reload the bootloader. Then run the Blink scketch and if it cycles a few times only or not at all, the board might have gone astray.

[@chawinchokchaimongkolkij563]

DHT22' was not declared in this scope

[@robojax]

You have not downloaded the library. Make sure to download and add it to the Arduino library folder. or if you have included the library make sure to uncomment the line // #define DHTTYPE DHT22 // DHT 22 by removing the // from the beginning of the line. Watch video for instrcution

[@gabrielebarbaraci3161]

code is wrong it says F1 is not declared

[@robojax]

you did not folow the instuction or wrong library is used.

[@aswathy1609]

code pls

[@robojax]

I just watch the video . You skipped the first 40 seconds where I mentioned how to get code.

[@jrsbrothers6724]

if the distance of the sensor is 20 meters with the arduino, can the sensor work?

[@robojax]

Yes the distance of communication is 20m mentioned here www.aosong.com/en/products-22.html

[@jrsbrothers6724]

@@robojax no need capasitor?

[@robojax]

why you ask about resistor? if you have this sensor, just watch and you should get all answers.

[@jrsbrothers6724]

@@robojax because the store that sells the sensor recommends if the distance is more than 2 meters requires a capacitor

[@robojax]

Datasheet is always the most correct information because that is from manufacturer.