arduino dht11 lcd display supplier

If you do not know about DHT11, DHT22 temperature sensor and LCD (pinout, how it works, how to program ...), learn about them in the following tutorials:

The above code also work for Arduino Nano. A grandfather, who learns through this tutorial to guide his grandchild has tested this code with Arduino Nano and send us the result like below:

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I have the dht11 reading and printing to lcd and serial monitor.I have the dht11 controlling two relays one for temp and one for humidity.When the relay turns on the dht11 stops sending readings and freezes and stops reading? Any way I can fix that ?thanks

The output is to the serial monitor, unless you have connected an LCD. The video will show you how to open the serial monitor if you don’t already know how to.

A quick question tho, do you have a tutorial on how to connect this to a wireless transceiver?? also in theory could i connect more then one humidity detector to an arduino in order to detect humidity from more then one spot? Thank you again and i’ve subscribed!

Hi Jose, you can definitely connect more than one sensor to a single Arduino. You would basically duplicate the code, and have a separate pins read the data from each sensor. As for connecting them to a wireless tranceiver, I’m sure it’s possible, but you would probably need to use another microcontroller as a hub to transmit the data. I haven’t tried it yet though, so don’t take my word for it!

Hello, I built my first arduino project (measuring the room temperature and humidity with the DHT11) during Christmas holidays. The readings of the values were shown on the screen of my laptop. The measured room temperature was correct, but the measured humidity was much too low (about 20%RH). What can be the reason for ithe low humidity? And how can the sensor (if needed) be recalibrated?

vcc is the left one, signal the middle one and ground is the round one, in case of a 3 pin DHT11. the diagram above is not right. i was getting the same problem here.

The diagram is correct for most three pin DHT11 modules. Depending on the manufacturer, the pins on the PCB might be different though. The pins should be labelled with S for signal and “-” or “GND” ground.

See the section “Output Humidity and Temperature Readings to an LCD Display” on a desktop… If you are viewing it on mobile, the full code might not display. Hope this helps

It sounds like you want to control the heater with the DHT11 and have the readings output to an LCD too… You can use the DHT11 to control the signal to a 5V relay, similar to what’s done in this article: https://www.circuitbasics.com/build-an-arduino-controlled-power-outlet/

Then you just need to add the code to initialize the LCD, include the LiquidCrystal library, and change the “serialprint()” functions to “lcd.print(). We have another article on setting up an LCD on the Arduino if you need help with it: https://www.circuitbasics.com/how-to-set-up-an-lcd-display-on-an-arduino/

i didnt have any trouble interfacing the arduino, lcd and the dht11 sensor and my codes were quite right since when i run it, nothing’s odd in the output. but when i connect the relay,in which an ac device is connected, as an output that turns on after a couple of minutes, the temperature and humidity dislayed on the lcd becomes odd, like chinese and numbers, after some time. i checked my codes but i cant figure out whats wrong with it.

please help me.. i won’t get Alarm temperature and humidity..and show in lcd display 16×2.. and changeing temperature, humidity alarm set point HOW IS DO… PLEASE HELP ME.

Any comments about DHTLib v0.1.14 vs. v0.1.21, and why this simple Arduino sketch works in the former, but not the latter? The brief history in the cpp file header for v0.1.21 looks like it took care of a few issues so my first instinct is to use that, but again, it results in all zero readings. Anyway, if no comments, well, I’ll have to take a look through the diffs between the two versions to see what might be causing the issue.

vcc is the left one, signal the middle one and ground is the right one, in case of a 3 pin DHT11. the diagram above is not right. i was getting the same problem here.

The diagram is correct, but your particular DHT11 could have a different pinout depending on the manufacturer. The DHT11 I used is from Keyes, what type do you have?

Are you using the four pin DHT11? If so you’ll need to put a 10K Ohm resistor between the Signal line and Vcc. I just added another diagram to the post to make it a bit clearer. That may be causing your issue.

Thanks a lot, may you please help me out, I am using a Mega 2560 with a DHT11 sensor, my problem is that both temperature and humidity reading is just being reed as 0.00 and they are not changing. What might i be doing wrongly, I have even tried the code that accompanies these tutorials

This seems like a really simple setup, but I’ve been having a lot of trouble setting this up. Have there been changes to this library? I have downloaded it, but arduino still refuses to recognize dht or any of the related functions, like temperature/humidity. It had a lot of trouble with line 3, dht DHT;. Any advice?

Hi, you mentioned you added a piece of code to show the “degree” symbol,” lcd.print((char)223)”, can you tell me if the number 223 is from the ASCII table.

vcc is the left one, signal the middle one and ground is the right one, in case of a 3 pin DHT11. the diagram above is not right. i was getting the same problem here.

i am doing fire alarm system using dht and lcd and GSM sim800l how can i make argument to send message from gsm if the sensor reading is higher that the set temp and how to declare it thanks for your response

I am very happy to inform you that I fixed successfully the temp and humidity project with LCD display. I would like to subscribe but cannot find the link.Many thanks

C:\Users\mhine\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.2.0\cores\esp8266/Arduino.h:227:63: error: cannot convert ‘volatile uint32_t* {aka volatile unsigned int*}’ to ‘volatile uint8_t* {aka volatile unsigned char*}’ in initialization

Hi. I have the same issue with the same board. Did you get it to succeed in the end? I would be interested, but I feel that it may be a compatibility issue with a 3rd-party board. I have tried the exact code with other Arduinos that I have and it works just fine.

I get this same error when I try to use the Arduino 101 instead of the Uno. I think the library doesn’t support the board. I would try finding a different DHT library, there are several others out there.

I Have issues with the Arduino recognizing the file dht.h. Was told no such file exist, meanwhile I have uploaded the zip file into the Arduino IDE, which showed in the file directory.

Did you use the library in the zip file from the post, or did you download it from the Arduino.cc page? Version 0.1.21 has some issues and doesn’t appear to work. The zip file in the post is version 0.1.14, and it does work. Also, are you using the Uno, or another board? I couldn’t get the library to work on my Arduino 101…

In this language, does declaring an object variable (as in “dht DHT;”) automatically instantiate it? I am more used to other languages that would need to follow the declaration with something along the lines of “DHT = new dht(params, for, constructor);” Does this normally go without saying in C++, or is this something the Arduino environment automatically adds at the preprocessing** stage?

**: If not “preprocessing,” then whatever else Arduino parlance calls the process of converting/expanding the “Processing” (??) or “Wiring” (???) code into standard C/C++ ????

hey can you pls help me how to use rf module with the above project. i am using two arduino uno, DHT11, LCD, RF transmitter and receiver. please can u give me a code to display temperature and humidity on the receiver side lcd…

I connected the LCD and the DHT11 and copied and pasted the code. It uploaded and then I look at my LCD and all I see are white boxes on the top of the display. Can anyone help me?

I copied this exactly and got it to display temperature and humidity, but it flashes -999 for temp and -999 for humidity every other second. For example, it will display correct readings for one second, then the -999 for both readings the next second.. Flashing between the two. Any ideas why it might be doing this. I have been playing with the code, rechecking pins, etc, but I cant seem to pinpoint the problem. Any input is appreciated.

hello, i need some help, i want code for, if i m sending message from mobile (e.g. ABC) to arduino via gsm module then the values of temperature and humidity receiving specific number

I have arn Arduino y module that I am using to trgger an extractor fan in a shower. I was wondering whether this humidity sensor could be used to simply close the 5v circuit so teh fan runs on until teh humidity is below a set vaue. Is that possible simply?

Hi.recently i conduct sensor circuitry.in source code,i notice that it use \xF8 to display temperature in degree celcius.what is the function of that?

I followed the instructions exactly, wiring was good, code was an exact replica of that given. Everything was correct, but I got -999 error message every time. I was using a three pin sensor, triple checked my wiring against the diagram. I increased the delay time to 3000ms. I was definitely using the correct older version of the library. After throwing out the sensor thinking it faulty, I have since discovered that the diagram above is does not apply to every dht11, that there are some where the pins are in a different order.

What does this mean? in every other arduino program I can find that uses additional libraries, the library is called first, then the code goes straight on to initialising the variables and describing the setup. I have not been able to find any other mention of the library name mentioned twice like this. A few people have asked about this, with no answers given. I cant even search for it because I dont know what to search by.

You will get 100% humidity if you put the sensor in water and it works. Use an SHT31-D breakout board to detect humidity and temperature. I’m sure you didn’t mean you are going to submerge the sensor. The SHT31-D is more accurate and easier to install and costs about the same as the DHT11 /22 both of which really aren’t accurate at all.

Ine is set up exactly as you show. I get -999.00 for both humidity and temperature. I have 2 different sensors (both DHT11) and I get the same readings. I even set this up on an RPI 3B+ and the readings were similar. 1.0 temp and humidity. What am I doing wrong?

I can not keep my display from blinking the temp and humidity values. It displays the value but blinks back and forth to -999.00. Thanks for the help I’m new

Still getting -999.00 on both temperature and humidity with LCD. If I connects ONLY DTH11 to Arduino with serial monitor it works fine, BUT if I connect it to LCD as described above it shows -999.00 In both LCD and serial monitor. It looks like it disables the DTH11 when connected to LCD. It does not work with dely(2000); or any other value.

i don’t know why but the LCD shows me white circles and within them the text is written also the temp and humidity are a constant 0 even with the serial monitor

It’s good idea for projects. I am thinking of building my own weather unit soon. Please can someone help me with a simulation circuit that will show the response graphs of dht11 for temperature and humidity

How would you configure Celsius to Fahrenheit when doing the LCD version? I read others commenting how with out the LCD but not with the code for using the LCD.

Recently I started playing around with DHT11 Temperature and Humidity sensor, at that time around, I had an idea to make a small yet effective Weather Station, so in this project, we will use the DHT11 sensor from the previous tutorial and turn it into mini weather station for our desk, so follow up this tutorial to build this awesome Weather Station for yourself!

I have previously covered the very basics of Arduino Micro controllers in a video, please go through it to understand the very basics of Arduino Boards.

we will be using i2c lcd in this project, to understand its basics and working, lets refer this video of mine, which explains very basics of writing i2c code in easy steps.

DHT 11 sensor is a Temperature and Humidity sensing module, which uses NTC - i.e. negative temperature coefficient to convert the temperature into equivalent resistance change. watch the following video for more detailed Tutorial and Working of DHT11 Sensor.

for this project, we are using an i2c lcd for display and DHT 11 sensor, along with Arduino Nano, so complete this circuit, I first designed and created a PCB design according to simple connections as shown in attached pictures, using a free software tool called "Easy EDA " but I could not order the PCB due to time constrains, so I rather used a breadboard, and connected the following pins to arduino, but if you want to order the PCB, you can use the following gerber files to order the pcb / make it for yourself

In this project, I wanted a startup animation screen which would display the my Channel name and Project name, next I needed to display the data from DHT11 sensor, so I set the cursor position on my LCD according the convenience and simply dumped the Temperature and Humidity values from the Variables that hold the data from sensor on the LCD screen using lcd.print command and that’s pretty much it, you can download and read the code, it’s pretty simple and straight forward. download the code and read it for better understanding.

after all these steps, I simply powered the arduino nano using USB, and tested the project, once the power is connected, the project takes around 1 second to startup and initialize, once the lcd"s backlight is on, the project says Mission Critical, Weather Station for around 600 microseconds and then the second screen loads up showing the room temperature in degree Celsius (°C) unit and Humidity in percentage (%)

Using a display to view the temperature and humidity of your environment can be possible using the DHT11 or DHT22 sensor with the easy to use Arduino microcontroller platform and that’s the goal of this project. For this project, we will be using the 16×2 LCD display module to display the temperature and humidity readings gathered from the environment using the DHT11 temperature and humidity sensor.

Although the DHT11 temperature and humidity sensor isn’t the fastest temperature and humidity sensor around, it has fair level of accuracy, +-5% for humidity readings and +-2% for temperature readings. With the DHT we will be able to measure temperature and humidity of the environment with a very fair degree of accuracy.

The LCD Keypad shield makes connecting the 16×2 LCD module to any system quite easy as it simply just plugs on the Arduino mega which is being used for this project.

Putting the component together is very easy if using the LCD keypad shield. All you just need to do is plug the LCD in as shown below and connect the DHT as described in the schematics above.

Note that the RW pin is connected to GND because we will be writing only to the LCD and not to read from it, for this to be possible the RW pin has to be pulled LOW

Pin connection of the dht11 to the arduino is as illustrated below. All DHT11 sensors have three main functional pins. The DHT types with four pins always have a void pin which is never connected to anything.

Before we start, we have to download DHT library and set its type. The required library is available on github. Download it and extract it into Arduino libraries folder, then open Arduino IDE. Its probably important to note at this point that the library will not be visible to an Arduino IDE instance that was already running before installation, you have to restart the Arduino IDE after installing the library.

With the next line, we create an LCD object,  passing in the Arduino pin numbers to which our LCD pins are connected as follows in the format lcd (RS, E, D4, D5, D6, D7).

In the setup function, we call the LCD begin method, passing in the LCD size which is a 16×2. Next, we print a message to indicate the device has commenced reading data from the sensor on the first line of the LCD then call the DHT begin method.

Moving on to the loop() function, we create two variables of type float which will hold the temperature and humidity value, give it a delay of two seconds after reading values into them and then clear the LCD.

Next we create two character arrays both of size six and then we use the dtostrf function to convert our temperature and humidity value from type float to string and then we print it on the LCD. Note that the explicit typecasting used in the lcd.print() function ((char)223) is used to print the degree symbol on the display.

Save your code, connect your Mega to your computer and make sure under your tools menu, the board picked is “Arduino/Genuino Mega or Mega 2560” and also ensure the right COM port is selected. Click upload when done and you should have something like the Image below.

If you’ve ever tried to connect an LCD display to an Arduino, you might have noticed that it consumes a lot of pins on the Arduino. Even in 4-bit mode, the Arduino still requires a total of seven connections – which is half of the Arduino’s available digital I/O pins.

The solution is to use an I2C LCD display. It consumes only two I/O pins that are not even part of the set of digital I/O pins and can be shared with other I2C devices as well.

True to their name, these LCDs are ideal for displaying only text/characters. A 16×2 character LCD, for example, has an LED backlight and can display 32 ASCII characters in two rows of 16 characters each.

If you look closely you can see tiny rectangles for each character on the display and the pixels that make up a character. Each of these rectangles is a grid of 5×8 pixels.

At the heart of the adapter is an 8-bit I/O expander chip – PCF8574. This chip converts the I2C data from an Arduino into the parallel data required for an LCD display.

If you are using multiple devices on the same I2C bus, you may need to set a different I2C address for the LCD adapter so that it does not conflict with another I2C device.

An important point here is that several companies manufacture the same PCF8574 chip, Texas Instruments and NXP Semiconductors, to name a few. And the I2C address of your LCD depends on the chip manufacturer.

So your LCD probably has a default I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it.

Connecting an I2C LCD is much easier than connecting a standard LCD. You only need to connect 4 pins instead of 12. Start by connecting the VCC pin to the 5V output on the Arduino and GND to ground.

Now we are left with the pins which are used for I2C communication. Note that each Arduino board has different I2C pins that must be connected accordingly. On Arduino boards with the R3 layout, the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. They are also known as A5 (SCL) and A4 (SDA).

After wiring up the LCD you’ll need to adjust the contrast of the display. On the I2C module you will find a potentiometer that you can rotate with a small screwdriver.

Plug in the Arduino’s USB connector to power the LCD. You will see the backlight lit up. Now as you turn the knob on the potentiometer, you will start to see the first row of rectangles. If that happens, Congratulations! Your LCD is working fine.

To drive an I2C LCD you must first install a library called LiquidCrystal_I2C. This library is an enhanced version of the LiquidCrystal library that comes with your Arduino IDE.

The I2C address of your LCD depends on the manufacturer, as mentioned earlier. If your LCD has a Texas Instruments’ PCF8574 chip, its default I2C address is 0x27Hex. If your LCD has NXP Semiconductors’ PCF8574 chip, its default I2C address is 0x3FHex.

So your LCD probably has I2C address 0x27Hex or 0x3FHex. However it is recommended that you find out the actual I2C address of the LCD before using it. Luckily there’s an easy way to do this, thanks to the Nick Gammon.

But, before you proceed to upload the sketch, you need to make a small change to make it work for you. You must pass the I2C address of your LCD and the dimensions of the display to the constructor of the LiquidCrystal_I2C class. If you are using a 16×2 character LCD, pass the 16 and 2; If you’re using a 20×4 LCD, pass 20 and 4. You got the point!

First of all an object of LiquidCrystal_I2C class is created. This object takes three parameters LiquidCrystal_I2C(address, columns, rows). This is where you need to enter the address you found earlier, and the dimensions of the display.

In ‘setup’ we call three functions. The first function is init(). It initializes the LCD object. The second function is clear(). This clears the LCD screen and moves the cursor to the top left corner. And third, the backlight() function turns on the LCD backlight.

After that we set the cursor position to the third column of the first row by calling the function lcd.setCursor(2, 0). The cursor position specifies the location where you want the new text to be displayed on the LCD. The upper left corner is assumed to be col=0, row=0.

There are some useful functions you can use with LiquidCrystal_I2C objects. Some of them are listed below:lcd.home() function is used to position the cursor in the upper-left of the LCD without clearing the display.

lcd.scrollDisplayRight() function scrolls the contents of the display one space to the right. If you want the text to scroll continuously, you have to use this function inside a for loop.

lcd.scrollDisplayLeft() function scrolls the contents of the display one space to the left. Similar to above function, use this inside a for loop for continuous scrolling.

If you find the characters on the display dull and boring, you can create your own custom characters (glyphs) and symbols for your LCD. They are extremely useful when you want to display a character that is not part of the standard ASCII character set.

CGROM is used to store all permanent fonts that are displayed using their ASCII codes. For example, if we send 0x41 to the LCD, the letter ‘A’ will be printed on the display.

CGRAM is another memory used to store user defined characters. This RAM is limited to 64 bytes. For a 5×8 pixel based LCD, only 8 user-defined characters can be stored in CGRAM. And for 5×10 pixel based LCD only 4 user-defined characters can be stored.

Creating custom characters has never been easier! We have created a small application called Custom Character Generator. Can you see the blue grid below? You can click on any 5×8 pixel to set/clear that particular pixel. And as you click, the code for the character is generated next to the grid. This code can be used directly in your Arduino sketch.

After the library is included and the LCD object is created, custom character arrays are defined. The array consists of 8 bytes, each byte representing a row of a 5×8 LED matrix. In this sketch, eight custom characters have been created.

A few years back, I created a new home automation course at Santiago Canyon College in Orange, Calif. where I taught Computer Science and Robotics. I wanted to introduce my programming students to microcontrollers so they could have some fun controlling things around their home. The students never built anything like that so I came up with a couple introductory level lab projects for them to try out. I decided to make a simple "weather station" project so they could learn how to build a circuit on a breadboard, learn to program an Arduino, and how to write some code that could read multiple sensors and display the readings on a small LCD display.

You will discover that you must have the correct Arduino libraries installed for your particular sensor. This is especially true when working with LCD displays. The one we use in this project is version 1.2 so be sure to download both the LCD and the DHT-11 temperature libraries from my websitehere. Unzip them on your desktop and copy each folder to your Documents | Arduino | Library folder. Be sure to delete any existing libraries with the same name.

Always choose wire colors that make sense to you. Use red for power, black for ground, and another color for the output of your sensors. Be very careful when you wire up the LCD. On the connector, you must connect wires to the right place. For some reason, LCD"s even from the same manufacturer have the connector pins in different positions. Look at my comments under the LCD section below to see how I wired it. I also added a closeup photo of my connections.

Notice how I added the resistors to the breadboard and how the green and yellow wires go from the LCD connector to those resistors and THEN connect to the Arduino. The SCL & SDA pins on the LCD each need a pull--up resistor or it won"t display properly! The resistors provide a small amount of current to the LCD so the Arduino signals are interpreted correctly.

In this tutorial, we will learn how to interface DHT11 with ESP32 DevKit Development Board. If you want to build a Web based Temperature and Humidity Monitoring System using ESP32, then DHT11 and DHT22 are the best choice as the Sensor. Learn how ESP32 DHT11 Humidity and Temperature Sensor interface works, setup Arduino IDE, display the humidity and temperature on an LCD. Additionally, you can design a simple ESP32 Web Server which continuously displays the humidity and temperature from DHT11 Sensor.

We already used DHT11 Temperature and Humidity Sensor in a couple of earlier projects involving Arduino, Raspberry Pi, ESP8266 and STM32F103C8T6. DHT11 is a digital Humidity and Temperature Sensor, which consists of a resistive type Humidity Sensor, an NTC Type Temperature Sensor and an 8-bit Microcontroller.[ESP32 Projects for Beginners]

It can measure Humidity in the range of 20% to 80% Relative Humidity and temperatures in the range of 00C to 500C. The microcontroller in the DHT11 Sensor performs all the ADC related stuff and provides the Digital data through a single wire.

Additionally, the DHT11 Temperature and Humidity Sensor can have a cable length up to 20 meters. This means you can easily implement a wired Sensor system which can go into lengthy places.

In the Arduino DHT11 Tutorial, I explained in detail how the data from DHT11 Sensor looks like and how to extract this data without using any library. This is very useful if you are writing your drivers for DHT11 Sensor for any other microcontroller.

I won’t go into the details but the output of DHT11 is a 40-bit data divided as 8-bit Relative Humidity Integer Data + 8-bit Relative Humidity Decimal Data + 8-bit Temperature Integer Data + 8-bit Temperature Decimal Data + 8-bit Checksum.

Now that we have seen a little bit about DHT11 Humidity and Temperature Sensor, let us now proceed with understanding how to interface DHT11 with ESP32. The first thing you have to remember is that DHT is a Digital Sensor (with an internal microcontroller performing the data acquisition and ADC conversion).

The next important thing to remember is it requires a single wire for communication. This means we can use any Digital GPIO Pin of ESP32 to send and receive data to / from DHT11 and we need only one wire for proper communication.

NOTE: I got a DHT11 Module with a 1 KΩ Pullup resistor on the Data Line already installed. If you are using just the sensor, then this pull-up resistor is important. A 5 KΩ Pullup is recommended by the manufacturer.

Next, the DATA pin. This pin should be pulled HIGH. As I have a module with a 1 KΩ Pullup already connected, I don’t need to make any additional connections. In case you are using only the DHT11 Sensor, then connect a 4.7 KΩ Resistor between Data Pin and VIN (or 3.3V) of ESP32.

You need to download a couple of libraries so that ESP32 will properly communicate with DHT11 Sensor. First is main DHT11 Sensor Library. Go to Tools -> Manage Libraries… in Arduino IDE.

After making the proper connections and installing the necessary libraries as mentioned above, we will now see how to read the humidity and temperature data from DHT11 Sensor using ESP32 and display the result on the Serial Monitor.

I wrote a simple code which will assign a pin to DHT11 Sensor, initialize the DHT11 Sensor and reads the humidity and temperature data from the sensor.

Displaying humidity and temperature values from DHT11 Sensor on Serial Monitor is useful just for testing the connections and the code itself. To build a practical “Embedded System” application, you have to use a display module of some kind (OLED, 16×2 Character LCD, Nokia 5110 LCD, graphical LCD etc.) to view the humidity and temperature readings.

I used a regular 16×2 Character LCD Display Module in combination with PCF8574 I2C LCD Module to display the temperature readings from ESP32 DHT11 Interface.

I made a dedicated tutorial on how to use an I2C LCD with ESP32. Check out that tutorial for in-depth information. I also discussed the necessary libraries you have download to successfully connects I2C LCD with ESP32 in that tutorial.

The additional components you require are a 16×2 LCD Display and an I2C LCD Module (based on PCF8574). Plug-in the I2C LCD Module at the back of the 16×2 LCD Display. The I2C LCD Module needs only four connections (two of them are for power and two are for data).

All the necessary connections between ESP32 and I2C LCD Module as well as between ESP32 and DHT11 Humidity and Temperature Sensor are shown in the following circuit diagram.

The code for ESP32 DHT11 Interface with I2C LCD is very simple. The initialization part of the sensor is similar to the previous code. Only the LCD related code is additionally added.

A beginner’s tutorial on interfacing DJT11 Humidity and Temperature Sensor with ESP32 is implemented here. You learned some basic information about DHT11 Sensor, how ESP32 DHT11 Interface works, necessary libraries for communicating with DHT11, how to display humidity and temperature data on Serial Output and also how to connect I2C LCD with ESP32 and display the humidity and temperature readings.

As far as a Web based Humidity and Temperature Monitoring System using ESP32 and DHT11 Sensor is considered, I will update this page shortly with the code for Web Server.

We have specific tutorials about DHT11, DHT22 temperature sensor and LCD. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:

This tutorial is all about Humidity & Temperature Monitoring using DHT11 & NodeMCU on ThingSpeak. It explains how to log Humidity & Temperature data on the cloud. We can use Thingspeak as a cloud service provider and DHT11 to measure temperature and humidity.

You just need NodeMCU ESP-12E WiFi Development board and a humidity sensor DHT11 or DHT22. In addition to this breadboard and connecting wires are required.

The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed).