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	- Project: **Sensor Data**
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-09 23:03:18

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

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void readTemperatureAndDisplay();
void countdown(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 LIBRARIES CLASS INSTANCES*****/
// Create instances for the sensors and LCD
DS18B20 tempSensor(temperatureSensor_DS18B20_DQ_PIN_D4);
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);
PulseOximeter pox;

// Countdown variables
unsigned long previousMillis = 0;
int countdownTime = 10;
bool countingDown = false;

void setup(void)
{
    // Initialize serial communication
    Serial.begin(9600);

    // Initialize the LCD
    lcd.begin(16, 2);
    lcd.print("Initializing...");

    // Initialize the DHT sensor
    dht.begin();

    // Initialize the 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_DHT22_DOUT_PIN_D9, INPUT_PULLUP);
    pinMode(PulseOximeter_MAX30100_INT_PIN_D2, INPUT_PULLUP);
    pinMode(temperatureSensor_DS18B20_DQ_PIN_D4, INPUT);
}

void loop(void)
{
    // Read temperature and display it on the LCD
    readTemperatureAndDisplay();

    // Perform a countdown of 10 seconds if not already counting down
    if (!countingDown) {
        countingDown = true;
        previousMillis = millis();
        countdownTime = 10; // Reset countdown
    }

    // Non-blocking countdown logic
    if (countingDown) {
        unsigned long currentMillis = millis();
        if (currentMillis - previousMillis >= 1000) { // Check if 1 second has passed
            previousMillis = currentMillis;
            if (countdownTime > 0) {
                lcd.setCursor(0, 1); // Set cursor to the second line
                lcd.print("Countdown: ");
                lcd.print(countdownTime);
                countdownTime--;
            } else {
                countingDown = false; // Stop countdown when it reaches 0
            }
        }
    }
}

void readTemperatureAndDisplay()
{
    // Read temperature from DS18B20
    float temperature = tempSensor.getTempC();
    lcd.clear();
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
}

/* END CODE */