nodejs install gpio

Preface

The Raspberry Pi is a single-board computer that is very suitable for developing small electronic projects, and Node.js is a very popular server-side JavaScript running environment. It is very convenient to use Node.js for GPIO (General Purpose Input and Output) operations on the Raspberry Pi, and you can also install various GPIO-related libraries and modules through NPM.

In this article, I will introduce you how to install GPIO on Raspberry Pi and use Node.js for GPIO operations.

Step 1: Install Node.js

If you haven’t installed Node.js on your Raspberry Pi yet, please follow these steps:

1. Open a terminal or SSH to your Raspberry Pi and enter the following command:

curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -

This command will download and install the latest version of Node.js (12.x). If you wish to install a different version of Node.js, change "12.x" in the command to your desired version number.

2. Install Node.js. Enter the following command:

sudo apt-get install -y nodejs

After the installation is complete, you can check whether the Node.js version is installed correctly:

node -v

If you see the version number of Node.js, it means it has been installed successfully.

Step 2: Install GPIO

GPIO on the Raspberry Pi requires the use of special libraries and modules to operate. There are many different GPIO libraries to choose from, including wiringPi, pigpio, etc.

In this article, we will install the wiringPi library. wiringPi is a very popular GPIO library that allows you to write GPIO applications in C, C++, and Python, among other languages. And it also contains some practical GPIO tools, such as gpio reading and writing.

The following are the steps to install wiringPi:

1. Enter the following command in the terminal to download wiringPi:

git clone git://git.drogon.net/wiringPi

2. Copy all the files in the downloaded wiringPi folder Copy to the /usr/local directory. Enter the following command in the terminal:

cd wiringPi ./build

3. Enter the following command in the terminal to check whether wiringPi is installed correctly:

gpio -v

If you see output similar to the following, wiringPi Correctly installed:

gpio version: 2.46 Copyright (c) 2012-2018 Gordon Henderson This is free software with ABSOLUTELY NO WARRANTY. For details type: gpio -warranty

Step 3: Use Node.js for GPIO operations

Now, we have successfully installed Node.js and wiringPi libraries, and can use Node.js for GPIO operations .

1. Open a terminal or SSH connection to your Raspberry Pi and create a new Node.js project.

2. Install the wiringPi library in the project directory. Open the terminal and enter the following command:

npm install wiring-pi --save

3. Create a file named "index.js" and add the following code in it:

const wpi = require('wiring-pi'); wpi.setup('wpi'); // 设置GPIO引脚为输出模式 wpi.pinMode(1, wpi.OUTPUT); // 打开LED wpi.digitalWrite(1, 1);

4. Go to the project directory in the terminal And execute the following command to run the Node.js application:

node index.js

If your application runs successfully, the LED will flash. This code will set GPIO pin 1 to output mode and set a 1 (high) on the pin to turn on the LED.

Conclusion

In this article, I introduced you how to use Node.js for GPIO operations on Raspberry Pi. The process of installing GPIO can be a bit tedious, but once completed, you can easily use Node.js for various GPIO application development. Furthermore, by using the various available GPIO libraries and modules, you can further extend the GPIO functionality and use the Raspberry Pi as a powerful tool for electronics project development.

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