// Smart Health Monitoring and Alert System

#include <Servo.h>
#include <LiquidCrystal_I2C.h>

// Initialize components
Servo servoMotor;
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pins for sensors and actuators
int heartRateSensorPin = A4;
int tempSensorPin = A5;
int waterButtonPin = 2;
int ledPin = 3;

// Variables for simulation
int simulatedHeartRate = 75;
int waitTime = 1000; // Time to wait in milliseconds

void setup() {
  servoMotor.attach(9); // Servo motor for medicine dispenser
  pinMode(heartRateSensorPin, INPUT);
  pinMode(tempSensorPin, INPUT);
  pinMode(waterButtonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);

  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
}

void loop() {
  simulateHeartRate();
  simulateTemperature();
  checkWaterIntake();
  
  delay(waitTime); 
}

void simulateHeartRate() {

  simulatedHeartRate = random(70, 91); 
  
  lcd.setCursor(0, 0);
  lcd.print("HR: ");
  lcd.print(simulatedHeartRate);
  lcd.print(" bpm    ");
}

void simulateTemperature() {
  // temperature variability
  int temperature = random(0, 15); 
  
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C    ");
}

void checkWaterIntake() {
  static unsigned long lastDebounceTime = 0;
  static bool isServoOpen = false;
  int reading = digitalRead(waterButtonPin);
  
  if (reading == LOW && (millis() - lastDebounceTime > 200)) { 
    lastDebounceTime = millis(); // Update the last debounce time
    
    if (!isServoOpen) {
      simulatedHeartRate += 5; // Increase heart rate due to activity
      servoMotor.write(0); 
      digitalWrite(ledPin, HIGH); // Turn on the LED
      isServoOpen = true;
      delay(waitTime); 
    }
  }
  
  if (isServoOpen && (millis() - lastDebounceTime > waitTime)) {
    servoMotor.write(90); // Close the servo
    digitalWrite(ledPin, LOW); // Turn off the LED
    isServoOpen = false;
    simulatedHeartRate = 75; // Reset to default heart rate
  }
}