**Health Monitor** rev_59

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    - Project: **Health Monitor**
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-09 23:36:06

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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>    //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();

/***** 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 ds(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);
PulseOximeter pulseOximeter;

// Non-blocking countdown variables
unsigned long countdownStartTime = 0;
bool countdownActive = false;
int countdownSeconds = 10;

void setup(void)
{
    Serial.begin(9600);
    lcd.begin(16, 2); // Initialize the LCD
    lcd.clear(); // Clear the LCD

    pinMode(temperatureSensor_DHT22_DOUT_PIN_D9, INPUT_PULLUP);
    pinMode(PulseOximeter_MAX30100_INT_PIN_D2, INPUT_PULLUP);
    pinMode(temperatureSensor_DS18B20_DQ_PIN_D4, INPUT);

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

void loop(void)
{
    // Read temperature from DS18B20
    readTemperature();

    // Check if countdown is active
    if (countdownActive) {
        unsigned long currentMillis = millis();
        if (currentMillis - countdownStartTime >= 1000) { // Check if 1 second has passed
            countdownSeconds--;
            countdownStartTime = currentMillis; // Reset the timer
            if (countdownSeconds <= 0) {
                countdownActive = false; // Stop countdown when it reaches 0
                lcd.setCursor(0, 1);
                lcd.print("Done!       "); // Clear the line after countdown
            } else {
                displayCountdown(); // Update countdown display
            }
        }
    }

    // Update pulse oximeter readings
    pulseOximeter.update();

    // Start countdown if not active
    if (!countdownActive) {
        countdownActive = true;
        countdownSeconds = 10; // Reset countdown to 10 seconds
        countdownStartTime = millis(); // Start the countdown timer
    }
}

void readTemperature() {
    float temperature = ds.getTempC(); // Get temperature in Celsius
    if (temperature != DEVICE_DISCONNECTED_C) {
        lcd.setCursor(0, 0);
        lcd.print("Temp: ");
        lcd.print(temperature);
        lcd.print(" C");
    } else {
        lcd.setCursor(0, 0);
        lcd.print("Temp: Error");
    }
}

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

void updateOutputs()
{
    // This function can be used for other output updates if needed
}

/* END CODE */