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	- Project: **Health Monitor**
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-12 22:31:48

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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 *****/


/********* User code review feedback **********
#### Feedback 1 ####
- display also max pulse oximeter
********* User code review feedback **********/

/* 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 updateOutputs();
void readTemperature();
void displayCountdown(int seconds);
void displayPulseOximeterData(); // New function prototype

/***** 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 RAW VARIABLES *****/
float temperature = 0.0; // Variable to store temperature
bool displayReady = true; // Flag to check if display is ready for next update

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// DS18B20 sensor instance
DS18B20 ds(temperatureSensor_DS18B20_DQ_PIN_D4);
// LCD instance
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);
// Pulse Oximeter instance
PulseOximeter pox;

void setup(void)
{
    // put your setup code here, to run once:
    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 Pulse Oximeter
    pox.setOnBeatDetectedCallback([]() {
        Serial.println("Beat detected!");
    });
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    pox.update(); // Update pulse oximeter readings

    if (displayReady) {
        readTemperature(); // Read temperature from DS18B20
        displayCountdown(10); // Display countdown
        displayPulseOximeterData(); // Display pulse oximeter data
    }
}

void readTemperature() {
    // Read temperature from DS18B20
    temperature = ds.getTempC();
    lcd.clear();
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
    displayReady = false; // Set flag to false until countdown is complete
}

void displayCountdown(int seconds) {
    for (int i = seconds; i > 0; i--) {
        lcd.setCursor(0, 1); // Move cursor to the second line
        lcd.print("Countdown: ");
        lcd.print(i);
        delay(1000); // Wait for 1 second
    }
    displayReady = true; // Set flag to true after countdown
}

void displayPulseOximeterData() {
    // Display heart rate and SpO2 on the LCD
    lcd.clear();
    lcd.setCursor(0, 0); // Move cursor to the first line
    lcd.print("HR: ");
    lcd.print(pox.getHeartRate());
    lcd.print(" bpm");
    
    lcd.setCursor(0, 1); // Move cursor to the second line
    lcd.print("SpO2: ");
    lcd.print(pox.getSpO2());
    lcd.print(" %");
}

/* END CODE */