NodeMCU ESP8266 สัปดาห์ที่ 16

 

ระบบ Digital Outing ด้วย RFID

เป็นระบบการออกนอกบ้านแบบดิจิทัลที่เรียบง่ายซึ่งใช้เทคโนโลยี RFID เพื่อลงทะเบียนรายละเอียดของนักเรียนที่เคลื่อนผ่านประตูรั้วมหาวิทยาลัย

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;

   }

  }

 }

}

เว็บ  https://www.hackster.io/clashers/digital-outing-system-using-rfid-d1dc3f