How to use DHT22 AM3302 Temperature and Humidity sensor with Arduino
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- เผยแพร่เมื่อ 19 มิ.ย. 2024
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In this video you will learn How to use DHT22 Temperature and Humidity sensor with Arduino code.
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Download the code: bit.ly/rjx-dht22
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If you wan to DHT22 to show temperature on 7-Segment Display, watch my other video:
• Using DHT22 Temperatur...
00:00 Start
00:44 Introduction
03:48 Wiring Explained
04:16 Downloading the library
06:34 Code explained
12:50 Demonstration
Tutorial by Ahmad Shamshiri form Canada
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Arduino Step by Step Course (over 100 lectures) Starts here • Lesson 00 What is Ardu...
Learn Arduino in 30 Minutes (video): robojax.com/L/?id=135
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#robojax #robojax_temperature - วิทยาศาสตร์และเทคโนโลยี
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 :))
You are very welcome. I am please that you found my tutorials helpful. I appreciate sharing my channel with your friends.
Awesome page ! thanks for all your advices and information that you share!
Thanks pal ! Love from France
explain more videos like this, the code in detail, I subscribed because of how detailed explenation was.
Good tutorial.Worked flawlessly.
Thanks
You are welcome.
Awesome video,
No music
Clean video
Nice VO
Lots of info
Thank you,
Subscribed, Liked and Saved
Much appreciated!
Amazing video. Really helpful.
You are welcome.
Thank you bro, you make my day..
My pleasure
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.=====================================================================================
You are welcome. I will make video on that as well.
as always I love watching your videos, how do handle negative temp. what changes do you have make in the code ?
thank you very much. For negative temperature, it should just work fine. No change it needed.
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?
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
thank you very match
You are welcome. The best thank you for me is to subscribe to my channel. Thanks
Thank you.
You are welcome.
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 ?
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.
Thank you bro!! good job! it does work for me
You're welcome!
Thank you for the video. Any idea how I can add a wifi module and send the data read as REST API ?
You are welcome. I would have to make video that. I have no tested code or components in hand.
Hi sir thanks for this helpful video i just wanna ask if the dht 22 can go faster than every 2 seconds loop?
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 .
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
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.
Robojax thank you for explain
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
You are welcome. This module doesn't need much power. Any wire will work.
Nice ! So just a basic USB wire is fine ? Thanks
tanks bro
You are welcome.
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?
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.
@@robojax Thank you so much, appreciate your reply.
Hello Robojax, Is it possible to have more than one DHT22 in the same project? Thanks
Yes. I will going to make a video on that but if you watch this video, it should work for you. th-cam.com/video/c90NszbNG8c/w-d-xo.html
kindly tell me that while you run DHT tester ,your uno borad is connected or not?
Of course it is connected. I connected to USB but you can connect it ot 6V to 15V power adapter .
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?
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 th-cam.com/video/JXCcmZUmzy8/w-d-xo.html
Thank you very much for your reply. It is OK.
Otherwise, you have very good, clear and understandable instructions.
(Sory,google translation)
@@robojax
Hi robojax, can i use this sensor and a mega arduino stand alone without connecting it to a pc ?
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 th-cam.com/video/-6qSrDUA5a8/w-d-xo.html
should we connect a resistor of 10k if its an Arduino mega 2560? or jus direct connection
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.
@@robojax
Ok thanks
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?
I don’t remember what was the humidity but this sensor is very accurate.
Please I would like to know if this temperature sensor can work on poultry farms. Thank you
Hello, it just senses the temperature and humidity and does not care about environment. Just make sure dirt does not cover it.
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?
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.
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)
either your are connecting the wires incorrectly or the sensor is bad. The only way to know is to connect another sensor.
Possible to provide the code if a turbidity sensor is used instead of temperature & humidity? my code doesn't seem to work.
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.
can we code this along with autonomous obstacle avoiding code??
Yes you can.
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 ?
I get the same thing! Did you get a solution for this problem?
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
Would it be possible to use two of these sensors simultaneously with Arduino?
Hello, yes you can use the idea from this video th-cam.com/video/L6ekl2ABcuY/w-d-xo.html to use two or more of this and here is how you can see it temperature from this sensor on mobile phone th-cam.com/video/1A4-6hDARQc/w-d-xo.html
@@robojax Thank you very much. I'm thinking of making a simple weather station that shows indoor and outdoor humidity and temperature
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
it means you have either incorrect wiring or dead module.
Plz name the library to be included there are many dht Libraries
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.
Hello
Can I take this code and make some changes to work with DHT11
have you looked at the code? there is DHT11. just comment (select) the right sensor.
@@robojax no I have not
Thanks
just the same.
22 is just an upgraded version
if the distance of the sensor is 20 meters with the arduino, can the sensor work?
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 TH-cam Video in a channel bit.ly/findTH-camVideo
Mine fails. In troubleshooting if found that "nan" is in temp_hum_val[0] and 0 is in temp_hum_val[1].
Nan means wiring is incorrect
Hi, why we had resistor in data pin
Hi, I have replied to this in one the comments earlier. Please scroll down.
i get this error "Error compiling for board Arduino/Genuino Mega or Mega 2560" how to solve it????
port problem. Try to select the right port.
Thanks for reply the error was due to missing library I download it and error disappear thank you
@@azwaqar which library i have the same problem
Hi, I'm using Dht 22, & I'm receiving *Nan%* errors, pls solve
bad wiring
Hi.. why did i get 'Failed to read from DHT sensor!' ?
Wiring problem. Check all 3 wires.
@@robojax ok.. thank you.. i'll try
Why do I get "Sync timeout"?
I haven't see it but google search showed this forum.arduino.cc/index.php?topic=91569.0
DHT22' was not declared in this scope
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
failed to read dht sensor what happenned
incorrect wiring, bad pin connection or bad modue.
Why does it read that my humidity 99.9% and temperature 129.9°C.
And both don’t change no matter what
It could be wiring problem
@@robojax and if it’s not a wiring problem, what other cause can it be?
Not sure, perhaps wrong model is selected in code.
@@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
@@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.
code pls
I just watch the video . You skipped the first 40 seconds where I mentioned how to get code.
code is wrong it says F1 is not declared
you did not folow the instuction or wrong library is used.
thanck you so much
You are welcome.
if the distance of the sensor is 20 meters with the arduino, can the sensor work?
Yes the distance of communication is 20m mentioned here www.aosong.com/en/products-22.html
@@robojax no need capasitor?
why you ask about resistor? if you have this sensor, just watch and you should get all answers.
@@robojax because the store that sells the sensor recommends if the distance is more than 2 meters requires a capacitor
Datasheet is always the most correct information because that is from manufacturer.