DHT11 Temperature & Humidity sensor with Arduino - Tutorial
ฝัง
- เผยแพร่เมื่อ 7 ม.ค. 2015
- Let's read some temperature and humidity with the help of this DHT11 module and an Arduino UNO.
To download the library we used and the sketch please check out our tutorials page at : brainy-bits.com/tutorials/ - วิทยาศาสตร์และเทคโนโลยี
![[TH] VCT Masters Shanghai Swiss Stage DAY 2 // GEN vs LEV | TH vs DRG](http://i.ytimg.com/vi/0YUmNgqb604/mqdefault.jpg)
Everyone keep in mind that he used a sensor mounted on a pcb. If you have just the bare sensor, you need a resistor across the analog and 5v pins or it won't work correctly. His already had this resistor on the pcb.
i would like to know one thing. Is it mandatory to connect the data pin to A0 ?Can I connect it to any digital pin instead?
@@madmaddy9473 u need to connect the pin to any analog pin, it cannot be in digital, because the value is in analog format
I'm a bit confused, the DHT11 is supposed to deliver a digital reading, not analog?
Tried many videos ......Yours Worked (THANKS)
It helps me for my robotic project thank you.
Hey Brainy , super easy and fast! thank you , if you allow me to say something , there is a huge difference of volume of sound between the start of video and in the middle. thanks again!
+Cadu da toro Hi, this was one of our earlier videos, so I was still new to making videos for TH-cam and didn't have the best equipment :) Our newer videos are a little better I hope, but always learning to make them better... Thanks for watching btw!
Very helpful. I found a good sketch that logs DHT22 to an SD Card. Arduino forums haven't helped me though in terms of including pressure data from a BMP280 in the sketch I'd like to use. Is there any way you could help me with that?
thank you. it worked for me nice and well. thankyou for the library also
0q2bsyng💝💗💓💝💗💕💙👍💞💗
Can you please include library properties? I want to code it in arduino droid for Android. It asks for library.properties
it's nice and clean, thanks!
Really helped, thank you!
Thanks man.
That works.
Any tutorial to use the sensor and a ESP8266 to check the data through an internet connection?
Why can't my sensor be placed in a position facing the Arduino (just as the one in your video). My sensor can only be placed from the other side, where the Arduino is on its right side, not facing it.
after adding library, it also says error
Great video and instructions. One question, shouldn't there be a pull up resistor for this setup ?
The Pull up resistor is for the non PCB version of this sensor, I heard this from other tutorial, Saludos
*NOTE: If you use a DTH11 or DHT22 module, these might already have a PullUp resistor installed onboard, in that case you shouldn’t use the internal PullUp resistor of the Arduino.
www.brainy-bits.com/dht11-and-dht22-with-arduino/
hii i want to apply my own temparature formula on DHT.temparature so i assigned to a variable Vo = DHT.temparature but its not working can u suggest some solution
ho! my good, finally its woek, i tested many codes, thanks you!....
川崎春と Thanks for the comment! Always great to hear that it's working! :)
kindly suggest some temperature sensor which is made up of that materiel which cant b melt because in my project sensor is directly touch all the time with fire
I need to look at the datasheet for this. It shows humidity going from 63% up to 75% after only a few seconds. Seems like a large drift in a short period of time.
I'm pretty sure that it is due to the humidity sensor being a capacitative sensor. Right when you turn it on the sensor is powered through vcc and charge begins building up on the capacitor. This is what appears as your initial drift.
Maybe it's because you are breathing on the sensor
my output for temperature and humidity both are -999 always.. can u help??
Works like a charm
lovely tutorial thanks for this
the stability of the readings from your sensor seem to be very erratic!
Hello. Is it normal that the humidity sensor is getting hot? What is its operating temperature?
Hello brainy how do i make it so it takes the highest temp/humidity and lowest?
I had to troubleshoot my sensor for an hour before I found your library download link for DHT.h + the accompanying code., I have the stater kit from elegoo, it doesn't have the best file set. I tried adding the files from elegoo to the library manually and also thru the add .zip function, however this just did not work. Errors after everything I tried. Anyways what im saying is I appreciate what you do! Thanks alot!
I am impressed - Your videos are incredibly impressive and genuinely helpful😀
Hi Ivan, thanks for this. It did the job and got the thing working for me. I have one question, is there any way to increase the accuracy of the sensor? It is only showing the temperature in whole numbers, is the sensor capable of reading the temperature in half degree increments? Thanks!
KiteSurfingPaul In the code here: Serial.print(DHT.temperature)
If you insert a ",2" like this: Serial.print(DHT.temperature, 2);
It should display 2 decimal point.
Haven't tried it with the DHT11, so let me know if it works :)
Thanks for your comment and watching!
Brainy-Bits No, unfortunately that does not seem to work. The code still compiles without a problem and displays the 2 '0' decimals. But only shows the whole number. I am using a DHT11.
KiteSurfingPaul Hi again. Let's try this:
create a float variable to hold the temperature near the top:
float tempvar = 0; // variable for holding temperature (float for decimal points precision)
Then replace the Serial.print(DHT.temperature, 2) line with:
tempvar = DHT.temperature;
Serial.print(tempvar, 2);
Let me know if that works, I'm not near my bench right now so can't test it :)
Brainy-Bits Unfortunately no change. Again it compiles without a problem, but makes no change on the LCD display or in the Serial monitor. I appreciate your help with this. But it is a just for fun hobby project here! So no need to bust a gut trying to resolve it!! I have an LM35 temperature sensor running along side the DHT11 and the LM35 shows the temp to 2dp. I just wanted to compare the two sensors for accuracy out of sheer curiosity!
KiteSurfingPaul It's seem that the DHT11 doesn't support decimals (kinda hard to find definitive answer on this but...).
Although some say that the DHT22 version does! Again can't confirm but that's what I'm finding. I guess that's a limitation of the DHT11. Well at least we've learned something new today! :)
If you want to help me to compile a sensor humidity and temperature DHT22 on Arduino mega 2560
thanks
sir how do i download the library and sketch as clicking on the link pops up just another window with tutorial not any download link !!!!?
#include "dht.h"
#define dht_apin A0 // Analog Pin sensor is connected to
dht DHT;
void setup(){
Serial.begin(9600);
delay(500);//Delay to let system boot
Serial.println("DHT11 Humidity & temperature Sensor
");
delay(1000);//Wait before accessing Sensor
}//end "setup()"
void loop(){
//Start of Program
DHT.read11(dht_apin);
Serial.print("Current humidity = ");
Serial.print(DHT.humidity);
Serial.print("% ");
Serial.print("temperature = ");
Serial.print(DHT.temperature);
Serial.println("C ");
delay(5000);//Wait 5 seconds before accessing sensor again.
//Fastest should be once every two seconds.
}// end loop()
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
humidity sensor is pretty unreliable
Hi need help I am getting zero for both temp as well as humidity. Tried all possible connections with this code. I have 3 pin dht11. What could be the possible reason????
Need help
mee
too
thanks bro, it's work! :D
Can u help for me ?
I try make a ATM machine ( software process).In serial port just read one time only .But i need to read more time in one loop ( for to enter the password and the select the account types etc...)
thank you !! good video
hi,nice work
a little question please they usually use an integrated system SHT10 equiped with that sensor what for??
+mooh artita The SHTxx sensors are more accurate but also more expensive, I believe that the SHTxx versions are also good for outside use since they can handle up to 100% humidity levels, the DHT11 is only rated up to 95%. So if you want accuracy and use it outdoors the SHTxx are better. Hope that helps and thanks for watching!
+Brainy-Bits thanks a lot :-)
'dht' does not name a type how do i fix this?
For anyone with the ERROR: 'DHT.h' there is no such file:
Change DHT to dht (small letters) in the beginning of the file.
Thanks dude you're a lifesaver
i am still facing the erroe.(error compiling for arduino genuino uno)
even though i change to small letter still got the same error on that
@@m.iinnovations8229 any fix for that
@@yusufabubakar9862 ^
posso collegare il sensore al campanello di casa? vorrei capire la temperatura dai miei ospiti
...how do I code a 5 sec delay DHT function to 1 second loop ...since 1second loop is printing inaccurate temperature reading...x2 the Celsius.....if corporates with 12c LCD ..Time Elapsed counter since PC bootup project
@DHT.readll(dht_apin);
exit status 1
expected unqualified-id before '.' token
please help Dx
Any chance you know if this would work with MIT App inventor 2, I'm trying to temp, humidity, gps, and prewritten message send to someone as a project. Thanks to anyone that can guide me to any kind of solution.
i am having this error..
please help
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.
sir can u please tell me the connections when arduino mega 2560 connected.
I saw some other websites explaining this and they have used a resistor(10k ohm) between the VCC and Data pins, is that necessary to use as you haven't done it hence the doubt
No meed, the DHT11 has 1k pull-up resistor onboard.
it says i need Adafruit_sensor may you help it would be appreciated
can you show us how to transmit this data wirelessly? Perhaps using a bluetooth module or something....
I’m using an Arduino DingMia Uno R3
When selecting a board “Arduino Uno” don’t come up as an option nether dos Arduino DingMia Uno R3. The closest board is “Arduino/Genuino Uno. What board would you selector or how would you get the right board to come up as an option?
Choose "Arduino/Genuino". This represents any board based on the Uno design. Thanks for watching!
Thank you for the reply
An error still comes up.
It reads: Error compelling for Board Arduino/ Genuino UNO
exit status 1
error compiling for board Arduino/Genuino Uno
Could this error have something to do with my Version of the Arduino software being a different version then your? I have the 1.8.5 for windows 1.8-10.0. Just a thought
Sorry can you help me? I'm using a nrf24l01 for arduino, but is very complicated, I don't understand very good the English manuals I can't use it, I only need send hello from arduino nano and receive it in arduino mega, but I can't , you know how make a simple code for transmission? Thanks for yours videos are very amazing!!
Awesome thank you brother
Thanks for taking the time to comment and for watching Tony. Cheers!
I've got a project to read humidity from DHT11 using multimeter. I believe I should convert the digital output of DHT11 into analog, but I am lost and dont have anymore ideas. Could you help me ? Thanks.
+Riszky Mf Can't help you with that one my friend, maybe someone here can. Thanks for watching!
Hi!! Thank you for the video... I had this error when compiling, compiler says: "'dht' does not name a type"
Download github.com/RobTillaart/Arduino/archive/master.zip
Copy the Arduino-master/libraries/DHTstable subfolder of the downloaded file to the libraries subfolder of your sketchbook folder. You can find the location of your sketchbook folder at File > Preferences > Sketchbook location in the Arduino IDE.
how can i set up my own using windows operating system not arduino and DHT11
my dht11 sensor is reading 0 for everything. Do you know why this might be?
You should probably use another pin connection. I suppose you got 3 pins. (Left to right: Analog input - 5V - Ground)
I had the same error and that helped me. Thanks!
David Hawiger you're welcome :)
Plug the output into digital pin 2 and use this program. Not mine i just got it working with this example program
/*
Board int.0 int.1 int.2 int.3 int.4 int.5
Uno, Ethernet 2 3
Mega2560 2 3 21 20 19 18
Leonardo 3 2 0 1
Due (any pin, more info arduino.cc/en/Reference/AttachInterrupt)
*/
#include
int idDHT11pin = 2; //Digital pin for comunications
int idDHT11intNumber = 0; //interrupt number (must be the one that use the previus defined pin (see table above)
//declaration
void dht11_wrapper(); // must be declared before the lib initialization
// Lib instantiate
idDHT11 DHT11(idDHT11pin,idDHT11intNumber,dht11_wrapper);
void setup()
{
Serial.begin(9600);
Serial.println("idDHT11 Example program");
Serial.print("LIB version: ");
Serial.println(IDDHT11LIB_VERSION);
Serial.println("---------------");
}
// This wrapper is in charge of calling
// mus be defined like this for the lib work
void dht11_wrapper() {
DHT11.isrCallback();
}
void loop()
{
Serial.print("
Retrieving information from sensor: ");
Serial.print("Read sensor: ");
//delay(100);
DHT11.acquire();
while (DHT11.acquiring())
;
int result = DHT11.getStatus();
switch (result)
{
case IDDHTLIB_OK:
Serial.println("OK");
break;
case IDDHTLIB_ERROR_CHECKSUM:
Serial.println("Error
\tChecksum error");
break;
case IDDHTLIB_ERROR_ISR_TIMEOUT:
Serial.println("Error
\tISR Time out error");
break;
case IDDHTLIB_ERROR_RESPONSE_TIMEOUT:
Serial.println("Error
\tResponse time out error");
break;
case IDDHTLIB_ERROR_DATA_TIMEOUT:
Serial.println("Error
\tData time out error");
break;
case IDDHTLIB_ERROR_ACQUIRING:
Serial.println("Error
\tAcquiring");
break;
case IDDHTLIB_ERROR_DELTA:
Serial.println("Error
\tDelta time to small");
break;
case IDDHTLIB_ERROR_NOTSTARTED:
Serial.println("Error
\tNot started");
break;
default:
Serial.println("Unknown error");
break;
}
Serial.print("Humidity (%): ");
Serial.println(DHT11.getHumidity(), 2);
Serial.print("Temperature (oC): ");
Serial.println(DHT11.getCelsius(), 2);
Serial.print("Temperature (oF): ");
Serial.println(DHT11.getFahrenheit(), 2);
Serial.print("Temperature (K): ");
Serial.println(DHT11.getKelvin(), 2);
Serial.print("Dew Point (oC): ");
Serial.println(DHT11.getDewPoint());
Serial.print("Dew Point Slow (oC): ");
Serial.println(DHT11.getDewPointSlow());
delay(2000);
}
I am not getting any errors but the Serial Monitor only gives me 0,00% Humidity and 0 C. The Library must be broken somehow
I managed to get it working. I used a diffrent library and changed arround the vcc and the signal Pin. Most charts online are actually wrong!!
@@theIfrit552 can you give me your lib bro?
Ya we need ur library 🥺
Thank you Thank you Thank you Thank you Thank you Thank you So much
My humidity sensor shows the same reading 95% ...its not changing...temp sensing is ok...what might be the problem?
Gracias por el video!!
I check my Arduino library and there is no such file as DHT or dht. what should I do?
I have that same problem and I've been searching for hours. did you ever figure out what to do
Do the 3 pin DHT11 and 22's not require the 10k resistor?
+Rob Stroh Since we are using a DHT11 "module", the required components are included on the module PCB. If you are using the bare "DHT11" sensor, then yes, you would have to include those before connecting to your Arduino. Thanks for watching!
I just had the same issue. Didn't work witz 10k ether. The solution: I used the 5V pin of the arduino nano, instead of 3.3v output pin (powered via usb). Dont need a pull up resistor, although I used the plain sensor (without PCB).
can program an arduino but cant get volume right on a video. maybe cc will work
Hi there...I am having two problems and I hope someone can help me as soon as possible. I did everything in that video but when I took the measurements, they are all -999. And the other problem is that my humidity sensor overheats soooo much to the extent that one time it started to melt, I mean the plastic blue part of it. Help, please!
same
Something is wrong here.. mine is overheats and melt too...
Try a resistor maybe
Use a resistor between the Voltage and the Data Pin to stop it from melting
this gives a nice overview for dht11
www.circuitbasics.com/how-to-set-up-the-dht11-humidity-sensor-on-an-arduino/@@sahandeepdas3627
also has a circuit diagram that shows how to put the resistor (if you scroll down)
(im a beginner so sorry if this was obvious to everyone except me^^)
Nevermind, everything has worked properly. However, why does it always give me values of 0 for temperature and humidity ?
Where can I find that sensor?
thank's a lot it work like a charm,
+Vicreo Legarreta Glad it helped :) thank you for watching!
Not workinf for me dht.H nO SUCH FULE OR DIRECTORY WTH I DOWNLOADED THE LIBRARY
where did get the code?
the code is correct. Connect the data pin to A0 on the Arduino Uno Board.
+Brainy-Bits Hi there. What about if I want to get the information of 2 or more DHT11 sensor. How does it change my program?
+Arturo Chunga Saavedra Hi, well my guess is that you just have to declare more variables at the top :
#define dht_apin0 A0 // Analog Pin Of DHT11 #1
#define dht_apin1 A1 // Analog Pin Of DHT11 #2
Etc...
Then print out each one by one:
DHT.read11(dht_apin0);
Serial.print("Current humidity 1 = ");
Serial.print(DHT.humidity);
Serial.print("% ");
Serial.print("temperature 1 = ");
Serial.print(DHT.temperature);
Serial.println("C ");
delay(5000);//Wait 5 seconds before accessing sensor again.
DHT.read11(dht_apin1);
Serial.print("Current humidity 2 = ");
Serial.print(DHT.humidity);
Serial.print("% ");
Serial.print("temperature 2 = ");
Serial.print(DHT.temperature);
Serial.println("C ");
delay(5000);//Wait 5 seconds before accessing sensor again.
+I haven't tried it, but I believe it should work! :)
Let me know! Thanks for watching!
+Brainy-Bits I will be trying in these days. Thank you for answer me so fast!! I'm really glad! :)
Arturo Chunga Saavedra You're welcome buddy! :) Let me know how it turns out!
It worked fine.
I downloaded the library, but when I try to activate the code, it displays an error message as if the library isn't there. But it's downloaded though. Need help, thanks.
So basically how do I extract the library inside the software ?
Sketch - include library - DHT (Mine is under contriubted library) Hope this helps
thanks dude!!
wokwi.com/arduino/libraries/DHT-sensor-library if this seems interesting, pls give a like and visit wokwi.com
Do you have a program?
Thank you so much
Thanks alot for your efforts....
But how can I send this data to another arduino through xbee model.
Please tell me if you Know any information about it ...
Im using RF modules to transmit data between multiple arduinos, their cheap as well.
+mike Rf like what?
I want to use xbee model but I still have many problem
did you get an answer to this question , i will like to use this . ive been searching
id kabasa I still do not have answer until now
Hi, sorry for the delay :(, don't have xbee available for testing right now, but I have a tutorial in the work to use some 2.4ghz wireless modules to send data between arduinos. Stay tuned... Sorry couldn't help with the Xbee...
You have help me greate
pls help, when i connect the 5v pin when ground is connected ,my arduino turns off (disconnects from my computer) and i am not able to upload the code and when i connect to 3.3v so it dosnt turn off but it doesn't work, pls help as fast as you can
thanks in advance
im not sure, but you should try to switch the pins. The same have happened to med with another component.
@@oliverstvold7397 thanks for the help but that was 2 years ago and the problem with me was i put the sensor and pins horizontally on the breadboard so all the Arduino pins were connected with each other which led to a short circuit (i know that's dumb)
Why did it start at 12 degrees C and go up to 19 so fast?
I did everything right but my arduino keeps outputting 0 on both temperature and humidity. What can I do?
same with me but i dont know whats wrong either
did you ever figure out why the output was 0? I keep getting 0 for my outputs.
for me .. it was bcz the wiring was wrong .. my sensor had 3 pins the first from the left is Analog input and the middle one was 5v and the right one was ground
yes thanks for your help is working
dhth say me no find in libreries
hello sir,
Can i use the same program with a DHT22 sensor?
+Jhonex Balatayo The library supports the DHT11, DHT21, DHT22, DHT33 and DHT44. Althought I only tested it with the DHT11 it should work the same with others. Hope that helps and thank you for watching!
hi. i'm using mega 2560 board instead of uno. i already follow your tutorial. but serial data com doesnt show the reading. the error as follows. can u help me on this?
Arduino: 1.8.12 (Windows Store 1.8.33.0) (Windows 10), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"
Sketch uses 4846 bytes (1%) of program storage space. Maximum is 253952 bytes.
Global variables use 293 bytes (3%) of dynamic memory, leaving 7899 bytes for local variables. Maximum is 8192 bytes.
Board at null is not available
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
Tq
Datasheet shows we need to use pull up resistor for DHT11, Can you explain it? Thanks
there is a 1k ohm resistor on the module
how do i get the code for the program
Sir can you please tell us the pin connections for Arduino Mega 2560 and how to display the temperature and humidity values on 1.8 TFT st7735
I've made a newer video about the DHT11 and DHT22, check it out here: th-cam.com/video/8tfj0ZfADcE/w-d-xo.html and also here's the tutorial page for more information:www.brainy-bits.com/dht11-and-dht22-with-arduino/ Hope that helps and thanks for watching!
Hi,
I have just got the sensor and did all the procedures as instructed. In the serial monitor, I receive 0% humidity and 0 C temperature. And if i unhook and hook up the sensor, I get 255% and 255C. Kindly help me fix the problem.
Thanks
+Suresh Natarajan Hard to say, but check the connections to the sensor, change the wires to make sure none of them are faulty and not making good contact. Make sure you are connected to the right pins using the right voltage etc... hope it helps, but it's hard to say what could be wrong... Hopefully it's not a bad sensor :( Thanks for watching btw!
Thanks for the reply. I have requested for the return of sensors in Amazon. They accepted it.
+Suresh Natarajan same problem here..then how u solve this problem?
it works but how to connect a lcd screen to it `?
Does it work with soil too?
enda en seevana vanguradhukune vareenga, mutta payale idhu humidity sensor da , soil ku poi soil moisture sensor
vei da pae payalae
For whatever reason, the temp and humidity both keep showing only zero
Hi !
Thanks for the tutorial. I got an error
DHT11:8: error: 'dht' does not name a type
Make sure the DHT library is uploaded and that you select it from the already uploaded libraries before you compile+upload the code to the Arduino.
can you please keep the DHT library plzzzz
me too
my library doesn't work with the line
#include "DHT.h"
or #include
but works with #include
or #include "dht.h"
the name is case sensitive
@@lukemagdalin6169 thanks
Anyway to calibrate this sensor ?
Thanks for the video! Your website doesn't work any more, do you still have the code?
Hi Willy, yes our site went down like 2 hours ago and we are working very hard to get it back online. We might have to switch Host provider since this has happened before :( We will let you know when we are back up, and we have the site backed up so the code will be available as soon as we're back up... Sorry for this! Thanks for watching!
Thanks so much, good luck!
Please give direct link to this project of your website
Thanks much!
Thanks much for watching :)
My sensor has the center pin as positive once I switched the data and positive it worked well.
Thanks for sharing your experience and for watching of course!
The same worked for me my sensor came from the Elegoo super starter kit.
Thank you Sir, IT worked for me too! Just interchanged the Analog and positive. LOVE YOU! I got kit from RobuIn
all code was dump...output does not show...what to do???
SAME HERE BRO
thanks a lot!!
+강상호 You're welcome and thanks for watching!
yeahhhhhhhhhhhhhhhhh thank thank thank you very much...... I love you bro
+Nguyễn Ngọc Quang Love you too man :) Thanks for watching!
+Brainy-Bits you don't have to do it ^^. i am very appriciate
Hey man. Would i ask some question ? It will not take a long time
Great Job
+Jay Zelsmite Thank you and thanks for watching!
Hi bro getting error in program..... 1 row getting error DHt.h
Thank You