Kids School Control

Preparation:

RFIDConnection

Pins:

We need this to connect our RFID module to Raspberry pi 3.

• Preparation

$ sudo nano /etc/modprobe.d/raspi-blacklist.conf
#blacklist spi-bcm2708
$ sudo apt-get install python-dev
$ git clone https://github.com/lthiery/SPI-Py.git
$ cd SPI-Py
$ sudo python setup.py install

• read.py When the script finds authorized card, it turns on the green led and send sms.

  import MFRC522
  import signal
  import os
  import time
  continue_reading = True
  MIFAREReader = MFRC522.MFRC522()
  cardA = [224,96,42,137,35]
  cardB = [176,203,130,124,133]
  cardC = [20,38,121,207,132]
  def end_read(signal, frame):
    global continue_reading
    continue_reading = False
    print "Ctrl+C captured, ending read."
    MIFAREReader.GPIO_CLEEN()
  signal.signal(signal.SIGINT, end_read)
  while continue_reading:
    (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
    if status == MIFAREReader.MI_OK:
      print "Card detected"
    (status,backData) = MIFAREReader.MFRC522_Anticoll()
    if status == MIFAREReader.MI_OK:
      print "Card read UID: "+str(backData[0])+","+str(backData[1])+","+str(backData[2])+","+str(backD$
      if  backData == cardA:
        print "Vasea Pupkin"
        os.system("python /home/pi/SPI-Py/MFRC522-python/greenled.py 2>/dev/null")
        date_string = time.strftime("%Y-%m-%d-%H:%M:%S")
        os.system("./sending.sh telnumber 'Vasea at school-'" + date_string)
      elif backData == cardB:
        print "Kris"
        os.system("python /home/pi/SPI-Py/MFRC522-python/greenled.py 2>/dev/null")
        date_string = time.strftime("%Y-%m-%d-%H:%M:%S")
        os.system("./sending.sh telnumber 'Kris at school-'" + date_string)
      elif backData == cardC:
        print "is Card C"
      else:
        print "wrong Card"
        os.system("python /home/pi/SPI-Py/MFRC522-python/redled.py 2>/dev/null")
  

• Using Example

$ git clone https://github.com/rasplay/MFRC522-python.git
$ cd MFRC522-python
$ sudo python read.py

$ sudo python read.py

Led Connection

Connect your led to any gpio you want + GND. In my case i used GPIO16 for green led and GPIO26 for red. When you are done, test it:

Create 2 simple python scripts for green and red led with following content:

• greenled.py

  from gpiozero import LED
  from time import sleep
  led = LED(16)
  while True:
      led.on()
      sleep(3)
      led.off()
      led.cleanup()
  

• redled.py

  from gpiozero import LED
  from time import sleep
  led = LED(26)
  while True:
      led.on()
      sleep(3)
      led.off()
      led.cleanup()
  

• And then test it. If led's are glowing, then everything works good.

python greenled.py
python redled.py

Sending SMS

 Here 3 steps are necessary:

1. Get session id
2. Get token
3. Send / receive sms

Step 1 - Get session id For getting the session id I use the following command in an own shell script. Create shell script session.sh :

#!/bin/bash

curl -b session.txt -c session.txt http://192.168.8.1/html/index.html > /dev/null 2>&1

Step 2 - Get token

For getting the token I use the following commands, also in an own shell script token.sh :

#!/bin/bash

TOKEN=$(curl -s -b session.txt -c session.txt http://192.168.8.1/html/smsinbox.html)
TOKEN=$(echo $TOKEN | cut -d'"' -f 10)
echo $TOKEN > token.txt

Step 3 Part A - Send SMS

Finally a third shell script "sending.sh" for sending the sms, which also invokes the two other scripts:

#!/bin/bash

NUMBER=$1
MESSAGE=$2
./session.sh
./token.sh
LENGTH=${#MESSAGE}
TIME=$(date +"%Y-%m-%d %T")
TOKEN=$(<token.txt)
SMS="<request><Index>-1</Index><Phones><Phone>$NUMBER</Phone></Phones><Sca/><Content>$MESSAGE</Content><Length>$LENGTH</Length><Reserved>1</Reserved><Date>$TIME</Date></request>"
echo $SMS
curl -v -b session.txt -c session.txt -H "X-Requested-With: XMLHttpRequest" --data "$SMS" http://192.168.8.1/api/sms/send-sms --header "__RequestVerificationToken: $TOKEN" --header "Content-Type:text/xml"

Now test it:

./sending.sh yourtelnumber "Hello World!"