// Wokwi Simulation - ESP32 with LDR and Exponential Smoothing
// α = 0.2 for noise reduction

const int ldrPin = 34;       // LDR connected to GPIO34 (Analog Input)
const float alpha = 0.2;     // Smoothing factor (0.0 to 1.0)
float smoothedValue = 0;     // Stores the smoothed value
unsigned long lastRead = 0;  // For timing
const int readInterval = 50; // Read every 50ms

void setup() {
  Serial.begin(115200);
  pinMode(ldrPin, INPUT);
  
  // Initial reading to start the smoothing
  int rawValue = analogRead(ldrPin);
  smoothedValue = rawValue;
  
  Serial.println("ESP32 LDR with Exponential Smoothing (α=0.2)");
  Serial.println("Time(ms)\tRaw\tSmoothed");
}

void loop() {
  unsigned long currentTime = millis();
  
  if (currentTime - lastRead >= readInterval) {
    lastRead = currentTime;
    
    // Read raw value from LDR
    int rawValue = analogRead(ldrPin);
    
    // Apply exponential smoothing
    smoothedValue = alpha * rawValue + (1 - alpha) * smoothedValue;
    
    // Print results
    Serial.print(currentTime);
    Serial.print("\t");
    Serial.print(rawValue);
    Serial.print("\t");
    Serial.println(smoothedValue);
  }
  
  // Small delay to prevent busy-waiting
  delay(1);
}