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	- Project: **Data Monitor**
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-07 23:19:15

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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);

/***** 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);
PulseOximeter pox;
DS18B20 ds18b20(temperatureSensor_DS18B20_DQ_PIN_D4); // Initialize DS18B20 with the data pin

// Non-blocking timing variables
unsigned long previousMillis = 0;
const long interval = 1000; // Interval for reading temperature and updating display
bool countdownActive = false;
int countdownSeconds = 10;

void setup(void)
{
    // Initialize Serial for debugging
    Serial.begin(115200);

    // Initialize LCD
    lcd.begin(16, 2);
    lcd.clear();

    // Initialize Pulse Oximeter
    if (!pox.begin()) {
        Serial.println("Failed to initialize pulse oximeter");
        while (1);
    }

    // Set up the DS18B20 sensor
    ds18b20.Update(); // Start temperature conversion
}

void loop(void)
{
    unsigned long currentMillis = millis();

    // Check if it's time to read temperature and update display
    if (currentMillis - previousMillis >= interval) {
        previousMillis = currentMillis;

        // Read temperature and display it
        readTemperature();
        
        // Start countdown
        countdownActive = true;
        countdownSeconds = 10; // Reset countdown
    }

    // Perform countdown if active
    if (countdownActive) {
        displayCountdown(countdownSeconds);
        countdownSeconds--;

        if (countdownSeconds < 0) {
            countdownActive = false; // Stop countdown when done
        }
    }

    // Update pulse oximeter readings
    pox.update();
    
    // Display heart rate and SpO2
    Serial.print("Heart rate: ");
    Serial.print(pox.getHeartRate());
    Serial.print(" bpm / SpO2: ");
    Serial.print(pox.getSpO2());
    Serial.println(" %");
}

void readTemperature()
{
    float temperature = ds18b20.GetTemperature();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
}

void displayCountdown(int seconds)
{
    lcd.setCursor(0, 1);
    lcd.print("Countdown: ");
    lcd.print(seconds);
}

/* END CODE */