Raspberry Pi Projects: กุมภาพันธ์ 2018

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

Download on Github https://github.com/amphancm/RasberryPi_NodeJS_Control_LED

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

http://softpowergroup.net/

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

Google+ https://plus.google.com/+SoftpowergroupNetThailand/

Android and Arduino IoT

Android Arduino Control Hardware

Raspberry pi connect RFID Reader ( SL500 USB )

We 'd like to use RFID card with Raspberry pi board for eMoney or RFID cash card Application in canteen of school.

RFID Reader

We want to use USB RFID Reader. we choose RFID reader model SL500 USB.
For Thailand Shop http://arduinoandroid.lnwshop.com/product/4/rfid-nfc-reader-writer

RFID Card

Famous RFID tag is NXP Mifare MF-1.

Overview

NXP® has developed the MIFARE® MF1ICS50 to be used in a contactless smart card according to ISO/IEC 14443 Type A.

The MIFARE MF1ICS50 IC is used in applications like public transport ticketing where major cities have adopted MIFARE as their e-ticketing solution of choice.

1.1 Key applications

Public transportation
Access control
Event ticketing
Gaming & identity

1.2 Anticollision

An intelligent anticollision function allows to operate more than one card in the field simultaneously. The anticollision algorithm selects each card individually and ensures that the execution of a transaction with a selected card is performed correctly without data corruption resulting from other cards in the field.

1.3 Simple integration and user convenience

The MF1ICS50 is designed for simple integration and user convenience. Which could allow complete ticketing transactions to be handled in less than 100 ms. Thus, the MF1ICS50 card user is not forced to stop at the reader leading to a high throughput at gates and reduced boarding times onto busses. The MIFARE card may also remain in the wallet during the transaction, even if there are coins in it.

1.4 Security

Mutual three pass authentication (ISO/IEC DIS 9798-2)
Individual set of two keys per sector (per application) to support multi-application with key hierarchy
Unique serial number for each device

EEPROM

1 Kbyte, organized in 16 sectors with 4 blocks of 16 bytes each (one block consists of 16 byte)
User definable access conditions for each memory block
Data retention of 10 years.