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	- Project: **Health Monitor**
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-08 14:26:57

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Read temperature from DS18B20 sensor and display */
	/* on LCD screen. */
/****** SYSTEM REQUIREMENT 2 *****/
	/* Perform a countdown of 10 seconds after each */
	/* temperature reading using LiquidCrystal library */
	/* for display control. */
/****** SYSTEM REQUIREMENT 3 *****/
	/* use max pulse oximeter */
/****** SYSTEM REQUIREMENT 4 *****/
	/* use non blocking code. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include 
#include     // https://github.com/matmunk/DS18B20
#include     // https://github.com/arduino-libraries/LiquidCrystal
#include     // https://github.com/adafruit/DHT-sensor-library
#include     // https://github.com/gabriel-milan/Arduino-MAX30100

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs();
void readTemperature();
void displayCountdown(int seconds);
bool countdownActive = false; // Flag to indicate countdown status
unsigned long countdownStartTime; // Start time for countdown
int countdownDuration = 10; // Countdown duration in seconds

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t temperatureSensor_DHT22_DOUT_PIN_D9 = 9;
const uint8_t PulseOximeter_MAX30100_INT_PIN_D2 = 2;
const uint8_t temperatureSensor_DS18B20_DQ_PIN_D4 = 4;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t myLCD_LCD1602_RS_PIN_D3 = 3;
const uint8_t myLCD_LCD1602_D4_PIN_D5 = 5;
const uint8_t myLCD_LCD1602_D5_PIN_D6 = 6;
const uint8_t myLCD_LCD1602_D6_PIN_D7 = 7;
const uint8_t myLCD_LCD1602_D7_PIN_D8 = 8;

/***** DEFINITION OF OUTPUT VARIABLES *****/
LiquidCrystal lcd(myLCD_LCD1602_RS_PIN_D3, myLCD_LCD1602_D4_PIN_D5, myLCD_LCD1602_D5_PIN_D6, myLCD_LCD1602_D6_PIN_D7, myLCD_LCD1602_D7_PIN_D8);
DHT dht(temperatureSensor_DHT22_DOUT_PIN_D9, DHT22);
DS18B20 ds18b20(temperatureSensor_DS18B20_DQ_PIN_D4);
PulseOximeter pulseOximeter;

/****** SETUP FUNCTION *****/
void setup(void)
{
    Serial.begin(115200);
    
    // Initialize LCD
    lcd.begin(16, 2);
    lcd.clear();
    
    // Initialize DHT sensor
    dht.begin();
    
    // Initialize DS18B20 sensor
    ds18b20.Update();
    
    // Initialize Pulse Oximeter
    if (!pulseOximeter.begin()) {
        Serial.println("Failed to initialize Pulse Oximeter!");
        while (1);
    }
}

/****** LOOP FUNCTION *****/
void loop(void)
{
    // Read temperature and display it
    readTemperature();
    
    // Check if countdown is active
    if (countdownActive) {
        // Check if countdown is finished
        if (millis() - countdownStartTime >= countdownDuration * 1000) {
            countdownActive = false; // Stop countdown
            lcd.clear(); // Clear the display after countdown
        } else {
            // Display remaining time
            int remainingTime = countdownDuration - ((millis() - countdownStartTime) / 1000);
            lcd.setCursor(0, 1);
            lcd.print("Countdown: ");
            lcd.print(remainingTime);
        }
    } else {
        // Start countdown after reading temperature
        countdownActive = true;
        countdownStartTime = millis(); // Record start time
    }
    
    // Update pulse oximeter readings
    pulseOximeter.update();
    
    // Display heart rate and SpO2
    Serial.print("Heart rate: ");
    Serial.print(pulseOximeter.getHeartRate());
    Serial.print(" bpm / SpO2: ");
    Serial.print(pulseOximeter.getSpO2());
    Serial.println(" %");
}

/****** FUNCTION TO READ TEMPERATURE *****/
void readTemperature() {
    float temperature = dht.readTemperature();
    if (isnan(temperature)) {
        Serial.println("Failed to read from DHT sensor!");
    } else {
        lcd.setCursor(0, 0);
        lcd.print("Temp: ");
        lcd.print(temperature);
        lcd.print(" C");
    }
}

/* END CODE */