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	- Project: **Health Monitor**
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-13 10:16:55

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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 <Wire.h>
#include <DS18B20.h>	//https://github.com/matmunk/DS18B20
#include <LiquidCrystal.h>	//https://github.com/arduino-libraries/LiquidCrystal
#include <DHT.h>	//https://github.com/adafruit/DHT-sensor-library
#include <MAX30100_PulseOximeter.h>	//https://github.com/gabriel-milan/Arduino-MAX30100

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void readTemperature();
void displayCountdown(int 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 *****/
float temperature = 0.0;
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);
DS18B20 ds(temperatureSensor_DS18B20_DQ_PIN_D4);
PulseOximeter pox;

void setup(void)
{
    // Initialize serial communication
    Serial.begin(9600);
    
    // Initialize LCD
    lcd.begin(16, 2);
    lcd.clear();
    
    // Initialize DS18B20
    ds.begin();
    
    // Initialize Pulse Oximeter
    if (!pox.begin()) {
        Serial.println("Failed to initialize Pulse Oximeter");
        while (1);
    }
    
    // Set up the Pulse Oximeter
    pox.setOnBeatDetectedCallback([]() {
        Serial.println("Beat detected!");
    });
}

void loop(void)
{
    // Read temperature from DS18B20
    readTemperature();
    
    // Display temperature on LCD
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
    
    // Perform countdown
    displayCountdown(10);
    
    // Update Pulse Oximeter
    pox.update();
    
    // Add a delay to avoid flooding the serial output
    delay(1000);
}

void readTemperature() {
    // Get temperature from DS18B20
    temperature = ds.getTempC();
}

void displayCountdown(int seconds) {
    for (int i = seconds; i > 0; i--) {
        lcd.setCursor(0, 1);
        lcd.print("Countdown: ");
        lcd.print(i);
        delay(1000); // Wait for 1 second
    }
    lcd.clear(); // Clear the LCD after countdown
}

/* END CODE */