/*

int ldrPin = A0;
int ldrVal = 0;
int ledPin = 2;

float GAMMA = 0.7;
float RL10 = 50;

void setup(){
  Serial.begin(9600);
  pinMode(ldrPin, INPUT);
  pinMode(ledPin,OUTPUT);
}

void loop(){
  ldrVal = analogRead(ldrPin);
  float voltage = (ldrVal/1024)*5;
  float resistance = 2000 * voltage/(5-voltage);
  float lux = pow(RL10 * 1e3 * pow(10,GAMMA) / resistance , (1/GAMMA));

  if(lux<200){
    digitalWrite(ledPin, HIGH);
  }
  else{
    digitalWrite(ledPin, LOW);
  }

  Serial.print("Lux value: ");
  Serial.print(lux);
  Serial.print(" | ");
  Serial.print("Resistance: ");
  Serial.print(resistance);
  Serial.print(" | ");
  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println("\n");
  delay(1000);
}

*/


int ldrPin = A0;    // Pin connected to the LDR sensor
int ldrVal = 0;     // Variable to store LDR value
int ledPin = 2;     // Pin connected to the LED

float GAMMA = 0.7;  // Gamma value for LDR
float RL10 = 50;    // Resistance at 10 lux (in kΩ)

void setup() {
  Serial.begin(9600);          // Start serial communication
  pinMode(ldrPin, INPUT);      // Set LDR pin as input
  pinMode(ledPin, OUTPUT);     // Set LED pin as output
}

void loop() {
  ldrVal = analogRead(ldrPin);            // Read LDR value
  float voltage = (ldrVal / 1024.0) * 5;  // Convert to voltage
  float resistance = 2000 * voltage / (5 - voltage);  // Calculate resistance
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));  // Calculate lux

  if (lux < 200) {
    digitalWrite(ledPin, HIGH);  // Turn LED ON if lux < 200
  } else {
    digitalWrite(ledPin, LOW);   // Turn LED OFF otherwise
  }

  // Print values for debugging
  Serial.print("Lux value: ");
  Serial.print(lux);
  Serial.print(" | Resistance: ");
  Serial.print(resistance);
  Serial.print(" | Voltage: ");
  Serial.println(voltage);
  
  delay(1000);  // Wait for 1 second
}