Arduino Project: Temperature and Humidity monitor Tutorial with DHT11 (or DHT22) sensor LCD shield.
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- เผยแพร่เมื่อ 6 มิ.ย. 2024
- Arduino Project: Temperature and Humidity monitor Tutorial using DHT11 (or DHT22) sensor and LCD shield.
In this video we are building a Temperature and humidity monitor, using an Arduino Mega, an LCD Display Shield with a DHT11 sensor. If you have a DHT22 sensor, the wiring is exactly the same.
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Ah very good explanation! I've done this project years ago still I like to build it again with DHT22.
OMG thanks man. You really helped me in my arduino projects.
Hello, thank you for sharing your code! I built your project on an Arduino Uno rev3 (Chinese clone with CH340T USB interface) and works as a charm.
*
Note1)
For all of those asking about problems in compiling or libraries, I have one single advice:
*** please download the DHT11 library from the Adafruit GitHub (press "See more* at the start of the description and follow the URL given by the author) ***
-----------------------------------------
Note2)
The code is made for Arduino Mega. To work on Arduino Uno (rev3), you have to change the number of the pin where Arduino is reading the data from the DHT sensor. Simply compare the pinmappings of Arduino Mega with those of Arduino Uno. You will see that pin22 of ArduinoMega board is connected to PA0(AD0) of the microcontroller. Now look in the schematic diagram of the Arduino Uno rev3 board and identify the corresponding AD0 of the Atmega328 processor; it's at the pin 23. On the pinmapping, you will find it at A0 (that is numbered as "14"). So, you will have to change the original code as here:
#define DHTPIN 14 // what pin we're connected to
If you use the LCD Keypad Shield from DFRobots, you may solder a female connector there, with the corresponding pin soldered directly to A0 on the LCD board (there is no hole for A0). Then, you may use some bulk female-to-male wires and another piece of female connector to plug the sensor.
This is the single modification that I've made, to make the original code to work on Arduino Uno. And as I said before, it works as a charm !
Good luck and thanks again to Educ8s.com !
Amateur Radio Club YO3KXL (Bucharest, Romania)
yo3kxl.netxpert.ro
Hey at last, Found something that works, just like it says on the tin, Great Tutorial, Thank you.
Arduino Noob You are welcome!
you right man, after i searching and reading a blogs, measuring humidity was quiet hard. and try comparing with dht22 or another sensors, the different was so far!
This is great!!! I made it work with an 20X4 LCD screen with an I2C 2 pin connection and an Arduino UNO. the only thing I had to modify was to add this lcd.setBacklight(HIGH); right at the begining of the void loop command. Thank you!
TBM tech You are welcome!
Thank you very much Man for your sharing..it helped me a lot. that was a good job.
Hello . Thank you for your nice explanation.
I have a question:
Are the sensors like LM35 and DH11-22 accurate and reliable?
Are it need to calibrate?
thank you
I got this working, but have a bad sensor. Will this code work for the dht22 as well?
I figured if I was getting another I might as well get the one with better range.
hey bro! ur videos r awesome..... can u pls tell how to use a separate humidity,temperature and pressure sensor??
cool, he measures power too
excelente vídeo saludos
works, only sometimes says that you can not read the data from the sensor "Failed to read from DHT sensor!". The resistor is set to 4.7 - did not help. Used DHT-22
hello! can this be used for controll temperature and humidity using a relay board?
how to set up code that you can adjust parameters via buttons on LCD board?
i planing to build one for my greenhouse. thanks in advance. regards, Mario
Good video
Outdoor DHT sensor doesnot read minus values at winter.
Please ,how can we fix the temperature from -50 to +50
can you help me about a temperature controller using atmega16 and DHT11 through keypad and lcd?
hi i have a question . i need to implement Temperature and humidity monitor, on atmega2560 with C language. do you think this source code will help me?
I have a Arduino Uno and don't know which pins to connect on the lcd module. A connection diagram wolud be nice at least in the other tutorials.
hi, does the lcd is enough to display rain, and dht data? and how is the code? im new to arduino. hope u can guide me. tq.
is LCD TFT Display applicable for the arduino ? do they differ in coding?
Is this compatible with a raspberry pi 3?
WORKS EXCELLENT ..THANKS BUT IF I WANT IN FARENHEIT..
cool.
My name is reghu I like your video too
Hello, thank You very match! Can I use Arduino Uno for this shield?
please make a new one with the new lib and a dht22
Hello.
I copyed your code exactly and i get a list of errors.
Im using uno with input from sensor on D3 with srew shield.
@edu8s.tv i tried this code on r3 esp8266. I am getting error : DHT does not name a type. Can you help?
Hi. Thanks for the code. However, NAN is getting displayed on lcd. Pl can you tell the solution to solve this problem.?
Question....The dhtt22 working great so somewhat...they are about 10 to 20ft away and I tested voltage. the voltage on the far one is 4.9v. one problem I am having is that sometimes the the temp drop from 70 degrees to 51.1 degrees. is there a way to correct this problem?
Is the sensor on it's own board like in the vid?
Amigo,você vende um esquema de de um termostato que controle a temperatura e umidade com temporizador.
I am trying to get this working on an Esp32 wroom. The ESP has built in wifi and Bluetooth so I can send the data gathered to another computer.
I have a project using dht22 sensor and transmit uses NRF24L01 transmitter module. Do you have reference about NRF24L01 for 2 way communication?
+guntur noor fadhly I am going to make a video about that soon,.
Just watched was cool, just got one trying to see what it can do. Will subscribe to your chanel.
It is easy. Try it, and please come back if you need any help, or want to share your success!
if I use a sensor dht22, and arduino uno . whether the same way ?
thanks for your videos its really helpful :)
Hanna Febriandini Yes it is the same way. You only have to change the code a little.
how diplay data of this sensor on web page using shield ethernet ?
HOW TO MAKE a RobotDyn LCD Keypad Shield 1602 16x2 Display Module for Arduino Uno - Blue IT WORK WHIT a wemos d1?
I got the code to compile without any issues, but I am getting the readings as T: NAN C H: NAN. I know that NAN stands for Not a Number, but I don't know how to resolve the issue. Could this be indicative of a bad sensor? What else could cause this?
Check your connections again, or try a new sensor.
thnx. i m getting output. but temperature is not varying very hardly!!!
need control temp use this set and modifly code??
i think when i playeed with these last year reading the data raw iand not using libraries that the sensor works in 1/3 of a degree C so returned like 10.0, 10.3, 10.6, 11.0 etc
I usually avoid the libraries for being slow
Hello, I have the code up and running but how can I change Celsius to Fahrenheit? It would be good help, thanks.
Carlos M Canjura Mayes you can use a math formula to change the final ouput variable
Thanks a million, I have been trying to get mine working for awhile now with some but limited results. Been playing with a DHT11 but got my DHT22 in the mail today, that combined with your stuff and a bit of my Americanization of it, I now have mine working giving me the Temp in F instead of the dreaded C that we in American look upon with fear and loathing. Here is my sketch, well your sketch but with a bit of modification:
#include
// DHT code from:
// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
#include "DHT.h"
#define DHTPIN 13 // what pin we're connected to
// Uncomment whatever type you're using!
// #define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
DHT dht(DHTPIN, DHTTYPE);
// LCD
// LCD RS=3, EN=4, DS4=5, DS5=6, DS6=7, DS7=8
#include
LiquidCrystal lcd( 8,9,4,5,6,7);
void setup() {
Serial.begin(9600);
// set up the LCD's number of columns and rows:
lcd.begin(16,2);
dht.begin();
}
void loop() {
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
int h = dht.readHumidity();
int t = dht.readTemperature();
// set the cursor to (0,0):
lcd.setCursor(0, 0);
// print from 0 to 9:
lcd.print("Temp: ");
lcd.print(t*9/5+32);
lcd.print("F");
// set the cursor to (16,1):
lcd.setCursor(0,1);
lcd.print("Humidity: ");
lcd.print(h);
lcd.print("%");
delay(200);
}
omg i cant thank u enough i was sitting the whole night in front of my pc and had the dht.h all most wanted to burn it down xD ps. welcome from germany
Glad it helped you out, my Grandfather came here from Germany back in the 1910's and began farming in North Dakota.
Jerry Ericsson Fahrenheit is shit
do you have the circuit?
plzzz need it
can we use arduino uno r3 for this and can it connect with dht11
Yes and yes, Just make sure to wire your module according to how the schematic tells you to. Make sure ground IS ground and 5v/VCC is actually 5v/VCC
Good information. I am wondering how we can add 2 library (One for Display and another one for Temp Sensor) in Arduino UNO IDE? Thank you..
Probably you have the LCD library already (after installing the IDE, which is my case) and you just have to #include it.
Just check ...Arduino/Libraries/LiquidCrystal. If you have it you're good to go, otherwise download it and create a folder called LiquidCrystal in that location (...Arduino/Libraries) and paste it there.
Hi Gulherme, Thank you for the answer. Here are the details about my project. I am using Arduino Uno with Nokia 5110 LCD Display and DS18B20 Thermal Sensor Probe. If i connect them separately then it works file. I would like to pull the temp reading on Nokia LCD 5110 Display which is not possible because i can not add (merge) both the library (5110 Display & One wire temperature sensor ) in Arduino IDE. Any suggestion. Thank you.
is it necessary to calibrate the sensor or it is auto calibrated??
I think they calibrate them at the factory
can i use the same code for arduino uno r3 (except the pin mode. i will change it.)
Raj Wadia no u cant get the dht.h lib any more only the DHT.h
nice projects
but you when convert float to string why we use number 0 and 2 and 5 and 1 in forumal
mustafa kenany I explain: dtostrf(temperature, 5, 1, tempF);
the 5 is the max digits. Temperature can be -10.1 for example which has 5 digits. The 1 is how many digits after the dot we want. We want only one digit for precision.
For humidity, it is simpler. We can't have negative values, we can have values for 00 to 99, so we only need 2 digits and we don't care about float numbers, so we put 0 for the digits after the dot. We only need to print integers.
can i use with arduino uno
yes
please Tell me one thing that is this project compatable for arduino Uno???
i have a ardunio Uno , in this microcontroller pins are less compared to the Arduino mega ,so i am getting confused as how to use this Arduino Uno...
udayan pandey Yes it is compatible with Arduino Uno.
+educ8s.tv
this is a helpful tutorial but could you add a fan and a relay to activate heating element
and use the Lcd along with the buttons to set and control the temperature it will be active station
or maybe with TFT touch screen ;)
thanks (y)
+Akrout Osama Hello, using a relay is not difficult. Also I am planning on using project with a touch screen soon!
+educ8s.tv Hi;
yes but setting the temp value and store it in the Eeprom this i found it difficult .
using a touch screen with GUI it id gonna be awesome ... i can't wait (y) ;)
thanks
i have this solution but with microcontroller PIC 16F887
I copied you code but a warning comes at the beginning. # include "DHT.h" it say that there is no such thing. Please help.
AAI30 Please, check that you have installed the DHT library correctly.
i am using a arduino uno with lcd screen and the same sensor as in video but i donot have same inputs for sensor on arduino can anyone help?
On the video description it state : "In this video we are building a Temperature and humidity monitor, using an Arduino Mega." Arduino Mega = more pins . Peoples should get used to read imho.
Looks great is there a download for the code??
Yes of course the is. In the description of the video. Everything is posted there. Thanks!
Many thx, great instructable
210jrd Thank you!
How many degrees are there?
There are as many degrees up as you have nickles for. On the way down though, they get rarer and rarer until they transform entirely into turtles. From there, it's turtles all the way down.
θέλω το Power supplyνα είναι 24 V DC (3.3-6V DC)
και το
Output signal να είναι
analogue 0-10 V ή 4-20 mA
(digital signal via single-bus) έχεις καμιά ιδέα; ευχαριστώ Θεοτόκης από Κύπρο .
Δυστυχώς Θεοτόκη δεν μπορώ να σε βοηθήσω σε αυτό.
Σε ευχαριστώ πολύ.
Hello. When I Try to download the code from the website, I am having this problem: The requested URL /Arduino/WeatherStation/code.zip was not found on this server.
Sorry for that, I will fix it soon.
educ8s.tv thank you!
The problem is now fixed! Cheers!
DHT dht(DHTPIN, DHTTYPE); ----> 'DHT' does not name a type ?
this is the error i get when verify... can anyone help me?
In file included from C:\Program Files (x86)\Arduino\libraries\DHT\DHT_U.cpp:22:0:
C:\Program Files (x86)\Arduino\libraries\DHT\DHT_U.h:25:29: fatal error: Adafruit_Sensor.h: No such file or directory
#include
^
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Mega or Mega 2560.
\
Arduino: 1.8.2 (Windows 7), Board: "Arduino/Genuino Uno"
C:\Users\Tapalla\Desktop\AlarmClock2\AlarmClock2.ino:3:17: fatal error: DHT.h: No such file or directory
#include "DHT.h"
^
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
Hope you could also help me ;(
Need to send out a warning about the DHT11 relative humidity-sensor. Its measurement values are very inaccurate. When humidity goes down below ~45% it fails badly. Check this graph that I posted on my Twitter account:
twitter.com/Diodens/status/640440428173639680
Note that you need a +13 offset for the DHT11 to even measure somewhat correct at any humidity.
+Diodens Thank you, very helpful!
+Educ8s.com Hi! You should check my tests of the DHT11 vs DHT22 here:
plus.google.com/+RickardBergstr%C3%B6m/posts/VxCPt5cv3b4
Seems to be way much better than the DHT11.
i keep having problems with this. it keeps telling me that dht was not declared in this scope. I even downloaded the library.
It seems from what you say, that the library is not set up correctly. Try to close Arduino IDE and reload it. If it is still not working, have you unzipped the library in the correct folder?
i know what i did. i added the library after i wrote the code so it didnt properly put the library in the code
Jake Lampada So now it works?
yes. it works great. I even added to the code to convert the celsius to fahrenheit.
Jake Lampada Where can you find that code?
iparxi kapio video gia na me efkolini parakalo;
Arduino:1.8.3 (Windows 8.1), Kart:"Arduino/Genuino Uno"
In file included from C:\Program Files (x86)\Arduino\libraries\DHT\DHT_U.cpp:22:0:
C:\Program Files (x86)\Arduino\libraries\DHT\DHT_U.h:25:29: fatal error: Adafruit_Sensor.h: No such file or directory
#include
^
compilation terminated.
"DHT.h" için birden fazla library bulundu
Kullanılıyor: C:\Program Files (x86)\Arduino\libraries\DHT
Kullanılmıyor: C:\Users\EyyüpEnsar\Documents\Arduino\libraries\DHT-sensor-library-master
exit status 1
Error compiling for board Arduino/Genuino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
???????
i have dht21
Goog evening, I download, and upload ( educ8.com/arduino/weatheratst, ) but not working. come error message. please, help me
Can someone show me how to/write me a code for the temperature in F rather than C
+jeremy williams °C x 9/5 + 32 = °F
+Christopher Sheffield thanks, but I really have no clue what I'm doing so I don't know where to put that and get the screen to read out the temp in F
+jeremy williams I will prepare the code for the F in a few days. I will include it in the file that you can download in the description. Stay tuned.
+educ8s.tv thank you so much I greatly appreciate you taking the time to help me
+educ8s.tv Sorry to bother you again, but the code still reads off in C even though it should be in F. I dont know what to do.
Why my lcd show me NAN
Then there is something wrong with the connection with the sensor, check your connections again
Your fucking setup melted my sensor
You probably did something wrong!
Make sure to double check that YOUR work looks correct to YOUR module and don't follow along blindly.
for example, MY module reads (from left to right, looking at the front) GROUND, DATA, VCC
dude are you sick your voice is not alive or expressive
Bernard, Could you give the tutor a break, he is speaking to you in his second language, I take it your Greek is faultless? I joke but you need really to take the lesson not the delivery seriously. Sorry to be so preachy but it helps to keep a neutral mind and look at the subject matter and usefulness, Best wishes to you and good luck with your learning.