Digital Lock Utilizing Internet Serial

A digital lock utilizing WebSerial leverages fashionable microcontroller expertise to create a safe and handy entry management system. This setup sometimes includes an ESP32 microcontroller, which hosts an online interface accessible by way of a neighborhood Wi-Fi community. Customers can connect with this community and enter a pre-set password by way of the WebSerial interface. The microcontroller processes the enter and controls a relay that prompts the lock mechanism. If the right password is entered, the relay is triggered, unlocking the door for a specified interval earlier than robotically re-locking. This technique enhances safety by permitting real-time, distant entry management and monitoring by way of a easy internet interface, making it an progressive answer for contemporary entry management wants.

Functions of the Digital Lock utilizing Webserial

• Enhances the safety of residential properties by offering distant entry management and real-time monitoring of entry factors.
• Utilized in workplace buildings to handle worker entry, guaranteeing that solely approved personnel can enter sure areas.
• Utilized in sensible locker programs for parcel supply and storage, enabling customers to securely entry their parcels utilizing an online interface.
• Permits lodge employees to remotely management and monitor room entry, bettering visitor safety and operational effectivity and plenty of extra.

Invoice of Supplies (BoM)

Elements	Description	Amount
Indus Board	3cm sized dev board	1
LED	5mm LED	1
Breadboard	3.5 cm x 4.5 cm breadboard	1
Wires	Jumper wires	4
Battery	3V Battery	1

Coding

#embody <Arduino.h>
#if outlined(ESP8266)
  #embody <ESP8266WiFi.h>
  #embody <ESPAsyncTCP.h>
#elif outlined(ESP32)
  #embody <WiFi.h>
  #embody <AsyncTCP.h>
#endif
#embody <ESPAsyncWebServer.h>
#embody <WebSerial.h>

AsyncWebServer server(80);

const char* ssid = "ESP Wifi"; // Your WiFi AP SSID
const char* password = "12345678"; // Your WiFi Password

// Password
String presetPassword = "1234"; // Pre-set password
String inputPassword = ""; // Consumer enter password

bool accessGranted = false;
unsigned lengthy unlockTime = 0;
const unsigned lengthy unlockDuration = 5000; // 5 seconds

/* Message callback of WebSerial */void recvMsg(uint8_t *knowledge, size_t len){
  WebSerial.println("Obtained Knowledge...");
  String d = "";
  for(int i=0; i < len; i++){
    d += char(knowledge[i]);
  }
  WebSerial.println(d);

  // Append the acquired knowledge to the enter password
  inputPassword += d;

  // If 4 digits have been entered
  if (inputPassword.size() == 4) {
    // Verify if the enter password matches the pre-set password
    if (inputPassword == presetPassword) {
      WebSerial.println("Entry Granted");
      // Unlock the door (activate the relay)
      digitalWrite(5, HIGH);
      accessGranted = true;
      unlockTime = millis();
    } else {
      WebSerial.println("Entry Denied");
    }

    // Clear the enter password for the subsequent try
    inputPassword = "";

    // digitalWrite(5, LOW);

    // Immediate the consumer to enter the password once more
    WebSerial.println("Enter the 4-digit password:");
  }
}

void setup() {
  Serial.start(115200);


  // Set relay pin as output
  pinMode(5, OUTPUT);  // Use GPIO 5 for instance, change if wanted
 
  // Initially flip off the relay (lock the door)
  digitalWrite(5, LOW);

  WiFi.softAP(ssid, password);

  IPAddress IP = WiFi.softAPIP();
  Serial.print("AP IP tackle: ");
  Serial.println(IP);

  // WebSerial is accessible at "<IP Handle>/webserial" in browser
  WebSerial.start(&server);
  /* Connect Message Callback */  WebSerial.msgCallback(recvMsg);
  server.start();

  // Immediate the consumer to enter the password
  WebSerial.println("Enter the 4-digit password utilizing the online interface:");
}

void loop() {
   if (accessGranted && (millis() - unlockTime >= unlockDuration)) {
    // Flip off the relay (lock the door) after 5 seconds
    digitalWrite(5, LOW);
    accessGranted = false;
   }
  // Do nothing right here as WebSerial handles the incoming knowledge
  WebSerial.print(F("IP tackle: "));
    WebSerial.println(WiFi.localIP());
    WebSerial.printf("Millis=%lun", millis());
    WebSerial.printf("Free heap=[%u]n", ESP.getFreeHeap());
    delay(1000);
}

Connection

Testing

Now we join the board with the USB and add the code within the indus board and examine output after giving command on internet serial. To attach indus board with internet serial sort (192.168.4.1/webserial) in internet browser. Then we can provide command 1234 which is password for the entry. If the password is right then it exhibits “Entry Granted” and open the door additionally LED begins glowing. Then if the password is wrong then it exhibits “Entry Denied” and the door is not going to open.

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Writer(s): Manjeet Vishwakarma,  Abhay Verma and Satywanti Kundu are B.Tech ECE college students at GJUS&T HISAR