วันพุธที่ 14 กุมภาพันธ์ พ.ศ. 2561

Raspberry pi Node.JS Webserver + WebSocket Control LED


Raspberry pi NodeJS Webserver + WebSocket Control LED

This article show how to use raspberry pi to be NodeJS webserver and control LED via websocket.

What is WebSocket?

WebSocket enables bidirectional communication in real time over the web.
WebSocket can be run together with a normal HTTP server. You can click a button in a web browser, and enable a GPIO on your Raspberry Pi which turns on a light in your house. All in real time, and with communication going both ways!

System Diagram



Wiring Diagram

Hardware
Raspberry Pi Board
LED
Push Button Switch
Resistor 100 - 470 Ohm ( for LED )
Resistor 1K - 50K Ohm ( for Pull-up switch )



This is my raspberry pi development board.






Software and Library

Check Node Version

$ node -v 

If you don't have node. Install Node first

curl -sL https://deb.nodesource.com/setup_10.x | sudo bash -

 sudo apt-get install nodejs

Then install npm

Install From Source
curl https://www.npmjs.com/install.sh | sudo sh

or install linux package
sudo apt-get install npm


check npm version

$ npm -v  

Install the onoff Module

To interface with the GPIO on the Raspberry Pi using Node.js, we will use a Module called "onoff".
Install the onoff module using npm:

$ npm install onoff


Install socket.io for Node.js

To download and install newest version of socket.io, use the following command:

$ npm install socket.io --save



Source Code


webserver.js

Public/index.html


Demo

Run Node.js Webserver 

$ node webserver.js


Open on Web Browser on your Raspberry pi IP address and port 8080


Control on Checkbox on Web Browser or Push Button Switch on Raspberry pi Board.
End the program with Ctrl+c.



Reference

https://www.w3schools.com/nodejs/nodejs_raspberrypi.asp


My Website

email : info@softpowergroup.net  ,amphancm@gmail.com  Tel .+6681-6452400

Android and Arduino IoT

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