Have you ever wanted to have sensors scattered all around your house and garden reporting their temperature regularly to a central server? Then, this IoT project might be the solid launching point for you!
It may look intimidating, but there are a few concepts you should be familiar with, before venturing further into this tutorial. If any of the concepts below sound foreign to you, consider reading at least skimming through that tutorial first:.
It has changed the way we work.
DHT11 sensor with ESP8266/NodeMCU using Arduino IDE
Physical objects and Start by placing the NodeMCU on to your breadboard, ensuring each side of the board is on a separate side of the breadboard. Now place the sensor on to your breadboard besides NodeMCU. Connect VCC pin on the sensor to the 3. If you happen to have a breakout board of the sensor, you need not add any external pull-up. It comes with a built-in pull-up resistor. And this protocol requires precise timing. The library is so powerful that it runs on both Arduino and ESP architecture.
There should be a couple entries. Look for DHT sensor library by Adafruit. Click on that entry, and then select Install. So, search the library manager for Adafruit Unified Sensor and install that too you may have to scroll a bit. Before you head for uploading the sketch, you need to make one change to make it work for you. You need to modify the following two variables with your network credentials, so that ESP NodeMCU can establish a connection with existing network. After uploading the sketch, open the Serial Monitor at a baud rate of Next, load up a browser and point it to the IP address shown on the serial monitor.
Finally we include DHT. Next, we need to define the type of DHT sensor we are using. Uncomment one of the lines below accordingly! The constructor of this object takes port where the server will be listening to as a parameter. Since 80 is the default port for HTTP, we will use this value. Now you can access the server without needing to specify the port in the URL.
So, that we can access special functions related to the DHT library. We also need to initialize the DHT object using begin function. Now, we need to join the WiFi network using WiFi. To do so, we use on method.
This method takes two parameters. Note that the URL specified is a relative path. We put this in a function as well, and use server.These sensors are very basic and slow, but are great for hobbyists who want to do some basic data logging.
The DHT sensors are made of two parts, a capacitive humidity sensor and a thermistor. There is also a very basic chip inside that does some analog to digital conversion and spits out a digital signal with the temperature and humidity. The digital signal is fairly easy to read using any microcontroller. We have two versions of the DHT sensor, they look a bit similar and have the same pinout, but have different characteristics.
Here are the specs:. Following output should be shown on the serial monitor. Hi, I'm Harshvardhan Mishra. I am a tech blogger and an IoT Enthusiast. I am eager to learn and explore tech related stuff!Blynk ESP8266 DHT11 Temperature Sensor
I generally appreciate learning by doing, rather than only learning. Thank you for reading my blog! Happy learning! Follow and send tweets me on harshvardhanrvm. If you want to help support me on my journey, consider sharing my articles, or Buy me a Coffee!
TickStack Tickscript? Skip to content. Like this: Like Loading Create host and browse documentation 30th March 20th February Harshvardhan Mishra 0. Leave a Reply Cancel reply.The objective of this post is to show how to connect the DHT11 sensor to an ESP and write a simple program to measure temperature and humidity. After proving the concept, then I start doing hardware optimizations, if they are needed.
DHT11 can measure both temperature and humidity and it is ideal for simple environment monitoring projects. The connection to the ESP is very simple, as shown in figure 2. Please check a detailed guide here if you have not already configured it to support ESP boards. Figure 3 — Installation of simple DHT sensor library through library manager. To import the newly installed library, put the following include on the top of your code:.
Also declare a global variable with the number of the GPIO pin, in order to make it easy to change.
In this case, we will use GPIO In your main loop declare two byte variables, one for the temperature and other for humidity:. We use byte variables since the DHT11 has only 8 bits resolution for both temperature and humidity . Finally, also in the main loop function, read the values and send them through serial:. Always check if the reading function returns an error before trying to use or send the data to other entity. Also, as stated before, double check your wiring, especially if you are using a nodeMCU.
If you open the serial monitor of the Arduino IDE, you should see something similar to figure 4. So, the sensor stays in a low power mode until receiving a start signal, to measure the temperature and the humidity.
It only takes a minute to sign up. Yes, it does work. Furthermore, anrieff's remarks regarding hardware-specific features are a good hint. As far as I see, the DHT sensor library does bit-banging, which is kind of expected given the ad-hoc nature of the protocol that DHT type of sensors utilize. It should be compatible, as the library doesn't use any Atmel-specific features of the MCU. Sign up to join this community. The best answers are voted up and rise to the top.
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Interface DHT11 DHT22 w/ ESP8266 NodeMCU Using Web Server
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Skip to content. Permalink Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Branch: master. Find file Copy path. Cannot retrieve contributors at this time. Raw Blame History. You can easily build graphic interfaces for all your projects by simply dragging and dropping widgets. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.
Download latest Blynk library here:. Blynk is a platform with iOS and Android apps to control. Arduino, Raspberry Pi and the likes over the Internet.
You can easily build graphic interfaces for all your. Blynk library is licensed under MIT license. This example code is in public domain. This example shows how value can be pushed from Arduino to. For this example you'll need Adafruit DHT sensor libraries:.
App project setup:.I'm Jeffrey Yu, an electronics beginner, I want to use ESP and DHT11 to make a temperature and humidity monitor, then I can monitor the data on the Internet,also I just want to get rid of Arduino and using ESP as a Microcontrollerso I dave into the materials which are talking about how to build one, but most of them are unreadable and quite confused because I tried some of them.
I will try to explain them clearly and easy to understand. Some soldering skills which I did very bad, you could see it later : - p may be neededcheck out this tutorial.
Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. ESP all models run on 3. OK, In this step you should get below materials:. You may ask, why we should use two capacitors? I thought, this is for ensuring a more clean DC output.
Looking the schematic of power supply and try to soldering them on the breadboard then test the outputs. Setting up ESP take me some time to figure out the right way. Now you have a 3. It's time to armour our soldier! Just four pins, that's all you need to wire up, now upload the sketch I uploaded or your sketch,test the result. I don't mention how to create a channel of ThingSpeak, you can easily google it. This is my first Instructable, I offer my apology for my bad grammar and misspelling, I'm glad hear your reply and correct my mistakes, leave your comments and advices.
I hope you will enjoying it and stay in creative! Hi, I see ESP as being 3. Reply 3 years ago. And if i have already uploaded a different program in arduino, so will the program in arduino be affected due to this program of esp? Like you I'm also trying to lean a bit more about the ESP So, I was wondering if its possibble to use this to control a relay, that will turn on a heater.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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This project brings support for the ESP chip to the Arduino environment. It lets you write sketches, using familiar Arduino functions and libraries, and run them directly on ESP, with no external microcontroller required.
Starting with 1. PlatformIO is an open source ecosystem for IoT development with a cross-platform build system, a library manager, and full support for Espressif ESP development. Using make instead of the Arduino IDE makes it easier to do automated and production builds. If you need help, have a "How do I If you find the forum useful, please consider supporting it with a donation. Please provide as much context as possible, as well as the information requested in the issue template:.
For minor fixes of code and documentation, please go ahead and submit a pull request. A gentle introduction to the process can be found here. Check out the list of issues that are easy to fix — easy issues pending. Working on them is a great way to move the project forward. Larger changes rewriting parts of existing code from scratch, adding new functions to the core, adding new libraries should generally be discussed by opening an issue first.
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Sign up. ESP core for Arduino. Branch: master. Find file. Sign in Sign up. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 3c9a75f Apr 28, Install the current upstream Arduino IDE at the 1.
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