// Smart led control  with security lock
#define pot  A0
#define led  9

String password = "123"; // password to unlock led control
bool accessGranted = false; // track if the user typed the correct passwd

void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  Serial.begin(31250);
  Serial.println("Enter password to control led:" );

}

void loop() {
  // put your main code here, to run repeatedly:
  if (!accessGranted)
  {
    // check if user typed in serial monitor
    if(Serial.available())
    {
      String input = Serial.readStringUntil('/n'); // read until end of line 
      input.trim(); //remove spaces or new line chars

    // Check if the input matches the correct password
      if (input == password) {
        Serial.println("Access granted :) You can control the LED!");
        accessGranted = true;
      } else {
        Serial.println("Access denied. Try again.");
      }
    }
  } else {
    // when access is granted:
    //read the potentiometer value
    int potValue = analogRead(pot);  // Read value (0 - 1023)
    
    // map pot value to brightness level (0 to 200 for safety).
    int brightness = map(potValue, 0, 1023, 0, 200);

    // Apply the brightness to the LED using PWM
    analogWrite(led, brightness);

    
    delay(100);
  }
}