Raspberry Pi - NFC door opener

As shown in the previous tutorial, using the MFRC522-python library (https://github.com/mxgxw/MFRC522-python.git) and the data read example script, I'm able to read the UniqueID (UID) of my NFC card.

On GPIO17 (= pin 11) I have the 220v relay signal that open the electric door lock. Therefore, editing the read example script, if an allowed UID is read than the door will be opened!

I add also a log file to control if somebody try to force the system

import RPi.GPIO as GPIO

import MFRC522

import signal

import time

import logging

# Logging

logging.basicConfig(filename='/var/www/nfc.log',

                            filemode='a',

                            format='%(asctime)s %(levelname)s %(message)s',

                            datefmt='%d/%m/%Y %H:%M:%S',

                            level=logging.DEBUG)

logging.info("script initialized")

# Create an object of the class MFRC522

MIFAREReader = MFRC522.MFRC522()

# 220v relay - electric door opener

GPIO.setmode(GPIO.BOARD) ## Use board pin numbering

GPIO.setup(11, GPIO.OUT) ## Setup GPIO17 -> pin 11 to OUT

GPIO.output(11,1)

# This loop keeps checking for chips. If one is near it will get the UID and authenticate

while true:

    

    # Scan for cards    

    (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)

    # If a card is found

    if status == MIFAREReader.MI_OK:

    

          # Get the UID of the card

          (status,uid) = MIFAREReader.MFRC522_Anticoll()

          # If we have the UID, continue

          if status == MIFAREReader.MI_OK:

          # My card UID

myUID = [141,113,243,56, 231]

# Check if authenticated

          if uid == myUID:

                  # open the door

                 GPIO.output(11,0)

                 time.sleep(1)

                 GPIO.output(11,1)

                  # save to log file

                  logging.info('Authenticated uid = %s' % uid)

else:

                 logging.error('Authentication failed uid = %s' % uid)

RFID-RC522 on Raspberry PI (Python)

Enable SPI interface

Edit /boot/config.txt and add the following lines

device_tree_param=spi=on
dtoverlay=spi-bcm2708

Reboot  the device.

Install Python header files

sudo apt-get install python-dev

Install SPI libraries

git clone https://github.com/lthiery/SPI-Py.git
cd SPI-Py
sudo python setup.py install

Test RFID-RC522

Use the following schema to link the RFID-RC522 to the GPIO

Name	Pin #	Pin name
SDA	24	GPIO8
SCK	23	GPIO11
MOSI	19	GPIO10
MISO	21	GPIO9
IRQ	None	None
GND	Any	Any Ground
RST	22	GPIO25
3.3V	1	3V3

Download the RFID-RC522 interface and test it

git clone https://github.com/mxgxw/MFRC522-python.git
cd MFRC522-python
sudo python Read.py

Touching the reader with a card, the output must be

Welcome to the MFRC522 data read example
Press Ctrl-C to stop.
Card detected
Card read UID: 141,113,243,56
Size: 8
Sector 8 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Install Tomcat8 on Raspberry Pi

Install tomcat from apt-get

sudo apt-get install tomcat8

Check if the installation is successful by accessing the raspberry from a web browser and port 8080 (in my case http://192.168.1.200:8080/)

The following page is returned

It works !

If you're seeing this page via a web browser, it means you've setup Tomcat successfully. Congratulations!
This is the default Tomcat home page. It can be found on the local filesystem at: /var/lib/tomcat8/webapps/ROOT/index.html
Tomcat8 veterans might be pleased to learn that this system instance of Tomcat is installed with CATALINA_HOME in /usr/share/tomcat8 and CATALINA_BASE in /var/lib/tomcat8, following the rules from /usr/share/doc/tomcat8-common/RUNNING.txt.gz.
You might consider installing the following packages, if you haven't already done so:
tomcat8-docs: This package installs a web application that allows to browse the Tomcat 8 documentation locally. Once installed, you can access it by clicking here.
tomcat8-examples: This package installs a web application that allows to access the Tomcat 8 Servlet and JSP examples. Once installed, you can access it by clicking here.
tomcat8-admin: This package installs two web applications that can help managing this Tomcat instance. Once installed, you can access the manager webapp and the host-manager webapp.
NOTE: For security reasons, using the manager webapp is restricted to users with role "manager-gui". The host-manager webapp is restricted to users with role "admin-gui". Users are defined in /etc/tomcat8/tomcat-users.xml.

RaspberryPi Webcam Server

Plugin a USB Webcam

Install the webcam server

sudo apt-get install motion

Edit the configuration file /etc/motion/motion.conf

daemon on
output_normal off
ffmpeg_cap_new off
webcam_localhost off

Edit /etc/default/motion to enable daemon service

start_motion_daemon = yes

Start motion

sudo service motion start 

Now you can open the streaming at raspberry address on 8081 port (http://xx.xx.xx.xx:8081)
ATTENTION! Try different browsers since it doesn't work on my laptop's Chrome

HTML EMBEDDED

You can embed the streaming on your custom page adding the following line

<img src="http://xx.xx.xx.xx:8081" />

where xx.xx.xx.xx is the raspi address. (127.0.0.1 doesn't work - I don't know why!)

RaspberryPi and Arduino - PHP Serial Communication

ARDUINO SIDE

Connect Arduino to Raspberry through USB.

Load on Arduino this simple sketch that sends back everything on serial port.

byte input;
void setup() {
        Serial.begin(9600);
}
void loop() {
        if (Serial.available()) {
                input = Serial.read();
                Serial.write((char)input);
        }
}

Test the Arduino connection using screen. Probably Arduino interface is /dev/ttyACM0

sudo screen /dev/ttyACM0 9600

RASPBERRY SIDE

To use serial port within PHP I suggest this library PhpSerial.php

Load on the WebServer this php page

<?php
  include 'include/PhpSerial.php';
  $serial = new phpSerial;
  $serial->deviceSet("/dev/ttyACM0");
  $serial->confBaudRate(9600);
  $serial->confParity("none");
  $serial->confCharacterLength(8);
  $serial->confStopBits(1);
  $serial->confFlowControl("none");
  $serial->deviceOpen();
  $serial->sendMessage("Hello World!");
  $read = $serial->readPort();
  echo $read;
  $serial->deviceClose();
?>

That's all!

PHP and MySQL on RaspberryPi

PHP

Install PHP and apache library.

sudo apt-get install php5 libapache2-mod-php5

MySQL 

Install MySQL server, client and php library.

sudo apt-get install mysql-server mysql-client php5-mysql

It will ask you a root password during the installation wizard. Remember it!

MySQL admin page

To easy manage the DB download "phpMyAdmin" from its site and extract it in /var/www/admin folder.

Restart the raspi.

Now you can control the DB from http://your.address/admin with MySQL root user and password. 

Control Raspberry Pi GPIO from web

WiringPi

The best way to control the GPIO interface is to use WiringPi library. See https://projects.drogon.net/raspberry-pi/wiringpi/ for installation instructions and some basic examples.

In this case I connect a LED to the GPIO 17 (pin 0 for WiringPi)

So the command to turn on the led is

gpio mode 0 out
gpio write 0 1

CGI script

Default Apache script directory  is /usr/lib/cgi-bin. Save here the scripts

ledOn.cgi

#!/bin/bash

#ledOn.cgi
#Turn on led on GPIO 17

gpio mode 0 out
gpio write 0 1
echo -e "Content-type: text/html\n\n"
echo "<h1>LED ON</h1>"

ledOff.cgi

#!/bin/bash
#ledOff.cgi
#Turn off led on GPIO 17
gpio mode 0 out
gpio write 0 0
echo -e "Content-type: text/html\n\n"
echo "<h1>LED OFF</h1>"

The echo commands are used to print HTML text on the browser.

IMPORTANT! Don't forget to make files executable:

sudo chmod +x /usr/lib/cgi-bin/ledOn.cgi
sudo chmod +x /usr/lib/cgi-bin/ledOff.cgi

Web Interface

This is the web page, with a javascript that run CGI scripts

<html>
<head>
<script>
function ledOn()
{
document.location="cgi-bin/ledOn.cgi";}
function ledOff()
{
document.location="cgi-bin/ledOff.cgi";}
</script>
</head>
<body>
<h1>GREEN LED</h1>
<button onclick="ledOn()">ON</button>
<button onclick="ledOff()">OFF</button>
</body></html>

The Result