// ESP32 Smart Temperature & Heart Rate Alert System
// Sensor behavior simulated using potentiometers

#define TEMP_PIN 34
#define HR_PIN 35
#define BUZZER_PIN 25
#define LED_PIN 26

#define BUZZER_CHANNEL 0
#define BUZZER_FREQ 2000      // 2 kHz
#define BUZZER_RESOLUTION 8   // 8-bit PWM

const float TEMP_HIGH = 37.5;
const float TEMP_LOW = 36.0;
const int HR_LOW = 60;
const int HR_HIGH = 100;

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

  pinMode(LED_PIN, OUTPUT);

  // ✅ PWM
  ledcAttach(BUZZER_PIN, BUZZER_FREQ, BUZZER_RESOLUTION);

  digitalWrite(LED_PIN, LOW);
  ledcWrite(BUZZER_PIN, 0);   // Buzzer OFF

  Serial.println("Vital Signs Monitoring Simulation Started");
}

void loop() {
  int tempRaw = analogRead(TEMP_PIN);
  int hrRaw = analogRead(HR_PIN);

  float temperature = map(tempRaw, 0, 4095, 30, 42);
  int heartRate = map(hrRaw, 0, 4095, 50, 120);

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C | Heart Rate: ");
  Serial.print(heartRate);
  Serial.println(" bpm");

  if (temperature > TEMP_HIGH || temperature < TEMP_LOW ||
      heartRate < HR_LOW || heartRate > HR_HIGH) {

    digitalWrite(LED_PIN, HIGH);
    ledcWrite(BUZZER_PIN, 128);  // 🔊 Sound ON
    Serial.println("⚠ ALERT: Abnormal Condition Detected");

  } else {

    digitalWrite(LED_PIN, LOW);
    ledcWrite(BUZZER_PIN, 0);    // 🔇 Sound OFF
    Serial.println("✔ Status: Normal");
  }

  Serial.println("----------------------------------");
  delay(2000);
}