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	- Project: **Data Display**
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-12 22:04:21

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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>    // DS18B20 library for temperature sensor
#include <LiquidCrystal.h>    // LiquidCrystal library for LCD
#include <MAX30100_PulseOximeter.h>    // MAX30100 library for pulse oximeter

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void readTemperature();
void displayCountdown();

/***** DEFINITION OF DIGITAL INPUT PINS *****/
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*****/
// DS18B20 instance
DS18B20 ds(temperatureSensor_DS18B20_DQ_PIN_D4);
// LiquidCrystal 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);
// MAX30100 Pulse Oximeter instance
PulseOximeter pox;

unsigned long lastReadTime = 0;
const unsigned long readInterval = 10000; // Read every 10 seconds
unsigned long countdownStartTime = 0;
bool countdownActive = false;

void setup(void)
{
    Serial.begin(9600);
    lcd.begin(16, 2); // Initialize the LCD
    ds.selectNext(); // Initialize DS18B20 sensor

    // Set up pins
    pinMode(PulseOximeter_MAX30100_INT_PIN_D2, INPUT_PULLUP);
    pinMode(temperatureSensor_DS18B20_DQ_PIN_D4, INPUT);

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

void loop(void)
{
    // Check if it's time to read the temperature
    unsigned long currentMillis = millis();
    if (currentMillis - lastReadTime >= readInterval) {
        lastReadTime = currentMillis;
        readTemperature(); // Read temperature and display
    }

    if (countdownActive) {
        unsigned long elapsed = millis() - countdownStartTime;
        int remaining = 10 - (elapsed / 1000);
        if (remaining >= 0) {
            lcd.setCursor(0, 1); // Move to the second line
            lcd.print("Countdown: ");
            lcd.print(remaining);
        } else {
            countdownActive = false; // Stop countdown after 10 seconds
            lcd.clear(); // Clear LCD after countdown
        }
    }

    pox.update(); // Update the pulse oximeter
}

void readTemperature() {
    float temperature = ds.getTempC(); // Get temperature from DS18B20
    lcd.clear();
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
    countdownStartTime = millis(); // Start countdown timer
    countdownActive = true; // Activate countdown
}

/* END CODE */