Lux meter using Photoresistor (LDR), Arduino and 10kΩ resistor

/*connection diagram

----------5v
|
|
resistor (10K)
|
|
----------A0
|
|
LDR
|
|
GND

*/

const int transmitInterval = 1000; // Time interval for transmitting data (in milliseconds)

const int ldrPin = A0;  // LDR connected to A0

void setup() {
  // Setup Serial Monitor for debugging
  Serial.begin(115200);
}

void loop() {
  int ldrValue = analogRead(ldrPin);  // Read LDR value
  float voltage = (5.0 / 1023.0) * ldrValue;  // Convert the analog value to voltage
  int lux = (250.0 / voltage) - 50.0;  // Convert voltage to lux (adjust these values according to your LDR and lighting conditions)

  Serial.print("Lux: ");
  Serial.println(lux);
  delay(transmitInterval);
}