#define TEMP_PIN 34
#define LIGHT_PIN 35
#define PIR_PIN 32

#define LED_PIN 25
#define BUZZER_PIN 26

float prevTemp = 0;
float alpha = 0.7;  // smoothing factor

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

  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

float readTemperature() {
  int value = analogRead(TEMP_PIN);
  float voltage = value * (3.3 / 4095.0);
  float temp = voltage * 100;  // simulated temp
  return temp;
}

void loop() {
  // 🔹 Read sensors
  float temp = readTemperature();
  int light = analogRead(LIGHT_PIN);
  int motion = digitalRead(PIR_PIN);

  // 🔹 Smooth temperature
  float filteredTemp = alpha * temp + (1 - alpha) * prevTemp;

  // 🔹 Decision logic
  String stress = "LOW";

  if (filteredTemp > 30 && light < 1500 && motion == 0) {
    stress = "HIGH";
  } else if (filteredTemp > 28) {
    stress = "MEDIUM";
  }

  // 🔹 Output control
  if (stress == "HIGH") {
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  // 🔹 Serial output
  Serial.print("Temp: ");
  Serial.print(filteredTemp);
  Serial.print(" | Light: ");
  Serial.print(light);
  Serial.print(" | Motion: ");
  Serial.print(motion);
  Serial.print(" | Stress: ");
  Serial.println(stress);

  prevTemp = filteredTemp;

  delay(1000);
}