NodeMCU ESP8266 Tutorials

NodeMCU ESP8266 Board Installation in Arduino IDE and Onboard LED Blink Example


NodeMCU ESP8266 Board Installation in Arduino IDE and Onboard LED Blink Example- The NodeMCU ESP8266 board has rapidly gained popularity among enthusiasts and professionals working on Internet of Things (IoT) projects. Its widespread appeal can be attributed to several key factors: its affordability, which makes it accessible for hobbyists and educational purposes; its versatility in handling various tasks; and most importantly, its built-in Wi-Fi capabilities, which are essential for IoT applications. The NodeMCU ESP8266 essentially bridges the gap between low-cost simplicity and high-functionality, allowing users to create complex IoT solutions without a hefty investment.

In this comprehensive guide, we aim to walk you through the process of setting up the NodeMCU ESP8266 board with the Arduino Integrated Development Environment (IDE). This setup is crucial as it lays the foundation for programming the board and leveraging its full potential. The Arduino IDE is a well-known platform in the maker community, celebrated for its user-friendly interface and extensive support for various microcontrollers, including the NodeMCU ESP8266.

Our tutorial will begin with a step-by-step guide on installing the NodeMCU ESP8266 board in the Arduino IDE. This process involves downloading the necessary board manager, selecting the right board, and configuring the settings to ensure seamless compatibility. We will also address common issues that may arise during installation and provide tips for troubleshooting.

Following the installation, we’ll delve into a practical example to demonstrate the capabilities of the NodeMCU ESP8266. The example we have chosen is a simple yet fundamental project in the world of electronics and IoT: blinking an onboard LED. This project serves as an ideal starting point for beginners, as it illustrates basic concepts of programming and hardware control. We will provide detailed instructions and code snippets, ensuring you can easily follow along and replicate the project on your own board.

By the end of this article, you will have a solid understanding of how to integrate the NodeMCU ESP8266 with the Arduino IDE and execute a basic program. This knowledge forms the foundation for exploring more advanced IoT projects and unlocking the full potential of this versatile board. Whether you are a hobbyist, student, or professional, the skills you acquire here will be invaluable in your journey into the world of IoT.

NodeMCU ESP8266 Pinout:

NodeMCU ESP8266 Board Installation in Arduino IDE

The NodeMCU ESP8266 is a popular IoT (Internet of Things) development board based on the ESP8266 Wi-Fi SoC (System on Chip). It is well-known for its ease of use and wide range of applications in home automation, sensor networks, and other IoT solutions. The 30-pin version of the NodeMCU provides a variety of GPIO (General Purpose Input/Output) pins and power options. Let’s discuss each of the pins you’ve listed:

Vin: This is the input voltage pin. It can be used to power the NodeMCU when you’re not using a micro USB to supply power. Typically, it can accept a range of voltages (often 5V to 12V).

GND: Ground pins. These are used to complete circuits and are common reference points for all signals.

RST: The Reset pin. When pulled low, it resets the ESP8266 chip.

EN: Enable pin. It’s also known as CH_PD or Chip Power Down. Pulling this pin high (to 3.3V) is necessary for the ESP8266 to operate.

3v3: 3.3 Volt power pins. These supply the power necessary for the ESP8266 and other 3.3V components on the board.

CLK, SD0, CMD, SD1, SD2, SD3, RSV: These pins are primarily used for connecting flash memory and SDIO interface. They are less commonly used in general projects but are essential for deep hardware-level operations.

A0: Analog input. This pin can be used to read analog voltages.

D0 – D8: These are the digital GPIO pins. They can be used as input or output pins for interfacing with different sensors, LEDs, and other digital components. Each pin has specific functions:

  • D0 (GPIO16): Can be used for deep sleep wake-up.
  • D1 (GPIO5) and D2 (GPIO4): Often used for I2C communication.
  • D3 (GPIO0) and D4 (GPIO2): These have built-in pull-up resistors and are often used for flashing new firmware.
  • D5 (GPIO14), D6 (GPIO12), and D7 (GPIO13): Commonly used for SPI communication.
  • D8 (GPIO15): Has a built-in pull-down resistor.

RX and TX: These are the serial communication (UART) pins. RX is used for receiving serial data, and TX is for transmitting serial data.

Additional GND and 3v3 pins: These are extra power and ground pins distributed across the board for easier access when connecting multiple components.

When using the NodeMCU ESP8266, it’s important to remember that the ESP8266 operates at 3.3V logic and is not 5V tolerant, so care must be taken to convert voltage levels from sensors or other peripherals that operate at a higher voltage. Additionally, the ADC (Analog to Digital Converter) on A0 can only handle a maximum of 1V.

For specific applications or configurations, it’s always a good idea to refer to the detailed datasheet or specific documentation related to the version of NodeMCU you are using.

NodeMCU ESP8266 Board Installation

Installing the NodeMCU ESP8266 board in the Arduino IDE is a straightforward process, but it’s crucial for harnessing the capabilities of the board for your IoT projects. The following steps will guide you through this installation process, ensuring that you can start programming your NodeMCU board with ease.

Begin by launching the Arduino Integrated Development Environment (IDE) on your computer. If you don’t have the Arduino IDE installed, you can download it from the official Arduino website. It’s available for various operating systems, including Windows, macOS, and Linux.

NodeMCU ESP8266 Board Installation in Arduino IDE

Once the Arduino IDE is open, navigate to the “File” menu at the top-left corner of the screen. From the dropdown menu, select “Preferences” to open the settings window. This window allows you to customize various settings of the Arduino IDE to suit your needs.

NodeMCU ESP8266 Board Installation in Arduino IDE

Enter the Board Manager URL: In the “Preferences” window, you’ll find a field labeled “Additional Boards Manager URLs”.

NodeMCU ESP8266 Board Installation in Arduino IDE

Here, you need to enter the URL for the ESP8266 board manager copy the below URL, and paste

This URL links to the package that allows the Arduino IDE to recognize and program the NodeMCU ESP8266 board.

NodeMCU ESP8266 Board Installation in Arduino IDE

Save the Preferences: After entering the URL, click “OK” to save your preferences. This action ensures that the Arduino IDE can retrieve the necessary files to support the ESP8266 board.

Open Boards Manager: Now, go to the “Tools” menu, hover over the “Board” submenu, and then select “Boards Manager” from the options. The Boards Manager is a feature within the Arduino IDE that allows you to add support for various microcontrollers and boards.

NodeMCU ESP8266 Board Installation in Arduino IDE

In the Boards Manager window, there’s a search bar located at the top. Type “esp8266” into the search bar. This action will filter the list of available boards and display those related to the ESP8266.

NodeMCU ESP8266 Board Installation in Arduino IDE

Install ESP8266 Board Package: In the search results, you’ll find an entry named “esp8266” by ESP8266 Community. Click on this entry, and then press the “Install” button.

NodeMCU ESP8266 Board Installation in Arduino IDE

This process will download and install all the necessary files required for the NodeMCU ESP8266 board. The installation might take a few minutes, depending on your internet speed.

NodeMCU ESP8266 Board Installation in Arduino IDE

Once the installation process is complete, you will receive a notification in the Boards Manager. This confirmation indicates that the ESP8266 board package is now installed and ready to use.

To start using the NodeMCU board, close the Boards Manager. Go back to the “Tools” menu, hover over the “Board” submenu again, and this time, you should be able to find the NodeMCU 1.0(ESP-12E Module). Select it, and you are now ready to program your NodeMCU board using the Arduino IDE.

NodeMCU ESP8266 Board Installation in Arduino IDE

Now that you have successfully installed the NodeMCU ESP8266 board, let’s proceed with the Onboard LED blink example.

Onboard LED Blink Example

Blinking the onboard LED is a basic but essential task that will help you understand how to control GPIO pins on the Nodemcu ESP8266. GPIO pins, or General Purpose Input/Output pins, are the digital pins on the board that can be used for both input and output operations.

Here’s a step-by-step guide to blink the onboard LED:

Connect your Nodemcu ESP8266 to your computer using a USB cable.

Open the Arduino IDE (Integrated Development Environment) on your computer.

Select the appropriate board and port for your Nodemcu ESP8266 in the Arduino IDE.

NodeMCU ESP8266 Board Installation in Arduino IDE

Open a new sketch in the Arduino IDE and copy the following code:

Code Explanation:

This line defines a preprocessor macro named LED and sets it equal to D0. This means that wherever LED is used in the code, it will be replaced with D0 during compilation. D0 refers to one of the digital pins on the NodeMCU board, specifically GPIO16.

This function is called once when the program starts. It’s used to initialize variables, pin modes, libraries, etc.

pinMode(LED, OUTPUT);: This line sets the digital pin (D0, which is represented by LED here) as an output pin. This is necessary to control an LED or any other output device connected to this pin.

This function runs repeatedly after setup() is finished. It’s the core of most Arduino sketches and is where the main logic of the code resides.

digitalWrite(LED, HIGH);: This line turns the LED on. It sends a HIGH signal (or 3.3V for NodeMCU) to the D0 pin.

delay(1000);: This line pauses the program for 1000 milliseconds, or 1 second. During this time, the LED remains on.

digitalWrite(LED, LOW);: This turns the LED off by sending a LOW signal (0V) to the D0 pin.

Another delay(1000);: This again pauses the program for 1 second, but now with the LED off.

Once you’ve copied the code, upload it to your Nodemcu ESP8266 by clicking on the “Upload” button in the Arduino IDE.

NodeMCU ESP8266 Board Installation in Arduino IDE

After the code is successfully uploaded, you should see the onboard LED blinking at a one-second interval. This indicates that the code is running correctly and the LED is being controlled by your Nodemcu ESP8266.

NodeMCU ESP8266 Board Installation in Arduino IDE

Expanding on the Onboard LED Blink

Now that you have successfully blinked the onboard LED, you can start exploring different variations and applications.

For example, you can modify the delay time in the code to change the blinking frequency. Try decreasing the delay time to make the LED blink faster, or increasing it to make it blink slower.

You can also use the onboard LED as a status indicator for other components or sensors connected to your Nodemcu ESP8266. For instance, you can make the LED blink faster when a certain condition is met, or turn it on or off based on sensor readings.

Additionally, you can connect external LEDs to other GPIO pins on the Nodemcu ESP8266 and control them in a similar manner. This allows you to create more complex lighting patterns or even build a multi-colored LED display.


In this article, we have discussed the process of installing the NodeMCU ESP8266 board in the Arduino IDE and provided a step-by-step guide for the LED blink example. By following these instructions, you can easily get started with the NodeMCU ESP8266 board and begin exploring its capabilities for your IoT projects. Have fun experimenting and creating!


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