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	- Project: **Health Monitor**
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-07 22:53:43

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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 */
/****** END SYSTEM REQUIREMENTS *****/


/********* User code review feedback **********
#### Feedback 1 ####
- use a non blocking countdown
********* User code review feedback **********/

/* 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
#include "custom_functions.h" // Include the custom functions for non-blocking countdown

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs();
void displayTemperature(float temperature);

/***** 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 LIBRARIES CLASS INSTANCES*****/
// Create instances for the sensors and display
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); // Assuming DHT22 sensor
PulseOximeter pox;
NonBlockingCountdown countdownTimer; // Instance of the countdown timer

void setup(void)
{
    Serial.begin(115200);
    
    // Initialize LCD
    lcd.begin(16, 2);
    lcd.clear();
    
    // Initialize DHT sensor
    dht.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!");
    });

    // Set pin modes
    pinMode(temperatureSensor_DS18B20_DQ_PIN_D4, INPUT);
}

void loop(void)
{
    // Read temperature from DHT sensor
    float temperature = dht.readTemperature(); // Use DHT for temperature reading

    // Display temperature
    displayTemperature(temperature);

    // Start countdown if not already counting
    if (countdownTimer.isFinished()) {
        countdownTimer.start(10); // Start a new countdown of 10 seconds
    }

    // Update countdown
    countdownTimer.update(lcd);

    // Update Pulse Oximeter readings
    pox.update();
    
    // Output heart rate and SpO2 values
    Serial.print("Heart rate: ");
    Serial.print(pox.getHeartRate());
    Serial.print(" bpm / SpO2: ");
    Serial.print(pox.getSpO2());
    Serial.println(" %");
}

void displayTemperature(float temperature) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
}

/* END CODE */