Digital Outing System Using RFID

It's a simple digital outing system which uses RFID technology to register the details of the student moving across the college campus gate.

IntermediateShowcase (no instructions)3 days2,956

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

Raspberry Pi 3 Model B

LED (generic)

Jumper wires (generic)

Breadboard (generic)

Buzzer

Resistor 221 ohm

SparkFun Pushbutton switch 12mm

RFID card tags

RFID Card Reader

Software apps and online services

MQTT

Django

SQLite

Story

In colleges and schools we have seen the usage of registers for making the entry when someone leaves the campus or enters inside the campus. This project uses RFID technology to mark the entry on a web page. See the videos for complete understanding.

Idea implemented by the project.

Components used

Working

Code

void setup() 
{
  Serial.begin(9600);// Initiate a serial communication
  SPI.begin();      // Initiate  SPI bus
  ESP.wdtEnable(4);
  client.setServer(mqtt_server,1883);
  client.setCallback(callback);
  ESP.wdtDisable();
  pinMode(2,INPUT);
  pinMode(3,OUTPUT);
  pinMode(0,INPUT);
  pinMode(16,OUTPUT);
  pinMode(15,OUTPUT);
  pinMode(10,OUTPUT);
  mfrc522.PCD_Init();// Initiate MFRC522
    WiFi.begin(ssid, wifi_password);

  // Wait until the connection has been confirmed before continuing
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
 if (client.connect(clientID)) {
    Serial.println("Connected to MQTT Broker!");
  }
  else {
    Serial.println("Connection to MQTT Broker failed...");
  }
}
void loop() 
{
    client.loop();
  // Look for new cards
  digitalWrite(3,LOW);
  digitalWrite(16,LOW);
  digitalWrite(15,LOW);
  digitalWrite(10,HIGH);
  while(!initcard())ESP.wdtFeed();
  //Show UID on serial monitor
  String content= "";
  byte letter;
  for (byte i = 0; i < mfrc522.uid.size; i++) 
  {
     content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? "0" : " "));
     content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  content.toUpperCase();
  data+="{";
  data+="\'";
  data+="ID";
  data+="\'";  
  data+=":";
  data+="\'";
  data+=content;
  data+="\'";
  data+="}";
  Serial.println(data);
  char c[25];
  for (int q=0;q<25;q++)
  c[q]=data[q];
  client.connect("First");
  client.publish("Data2",c);
  w = "z";
  ESP.wdtDisable();
  while(w=="z")
  {
    client.subscribe("Data3");
    if (w!="z")
    { 
      client.disconnect();
      break;
      }
      
   }
  ESP.wdtEnable(4); 
  memset(&c[0], 0, sizeof(c)); 
  Serial.println("Exited from loop 1"); 
  data ="";
  if(w=="0")
  { 
    client.connect(clientID);
    w="z";
  Serial.println("Reached in loop2");  
  y=digitalRead(2);
  z=digitalRead(0);
  Serial.println();
  digitalWrite(10,LOW);
while((y==HIGH) && (z==HIGH))
{  
   y=digitalRead(2);
   z=digitalRead(0);
   digitalWrite(3,HIGH);
   ESP.wdtFeed();
   if((y==LOW)||(z==LOW))
   {
   if (y==LOW) 
   {p="Home";
   digitalWrite(16,HIGH);}
   else{
   p="Market";
   digitalWrite(15,HIGH);}
  data+="{";
  data+="\'";
  data+="ID";
  data+="\'";  
  data+=":";
  data+="\'";
  data+=content;
  data+="\'";
  data+=",";
  data+="\'";
  data+="Purpose";
  data+="\'";
  data+=":";
  data+="\'";
  data+=p;
  data+="\'";
  data+="}";
  Serial.println(data);
   char c[100];
   for (int q=0;q<data.length();q++)
   c[q]=data[q];
  digitalWrite(3,LOW);
  if (client.publish(mqtt_topic,c)) {
      Serial.println("Button pushed and message sent!");
    }
     else {
      Serial.println("Message failed to send. Reconnecting to MQTT Broker and trying again");
      client.connect(clientID);
      delay(1000); // This delay ensures that client.publish doesn't clash with the client.connect call
      client.publish(mqtt_topic,c);
    }
  data="";
  memset(&c[0], 0, sizeof(c));
  delay(1000);
   break;
   }
  }
 }
}

def on_message(client, userdata, message):
    if message.topic == "Data":
        e=""
        c=message.payload
        for i in range(37):
            e+=c[i]
        q=0
        d=ast.literal_eval(e)
        y=time()
        if (d['Purpose']=="Mrkt"):
            d['Purpose']="Market"
        conn=sqlite3.connect('db.sqlite3')
        c=conn.cursor()
        c.execute("""CREATE TABLE IF NOT EXISTS student_nodemcu (RFID varchar(30),Purpose varchar(20),Status varchar(20), In_Time varchar(20), Out_Time varchar(20))""")
        c.execute("SELECT * FROM student_nodemcu")
        fetch = c.fetchall()
        for f in fetch:
            if (str(f[1])==str(d['ID'])):
                       q=1
                       c.execute("UPDATE student_nodemcu SET Status= 'OUT' WHERE RFID=(?)",(str(f[1]),))
                       c.execute("UPDATE student_nodemcu SET Purpose= (?) WHERE RFID=(?)",(d['Purpose'],str(f[1])))
                       c.execute("UPDATE student_nodemcu SET Out_Time= (?) WHERE RFID=(?)",(y,str(f[1])))
                       c.execute("UPDATE student_nodemcu SET In_Time= (?) WHERE RFID=(?)",("-",str(f[1])))

        if q==0: 
           c.execute("""INSERT INTO student_nodemcu (RFID,Purpose,Status,Out_Time,In_Time) VALUES((?), (?),(?),(?),(?))""", (d['ID'],d['Purpose'],'OUT',y,"-") )
        conn.commit()
        conn.close()