**Data Display** rev_61

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    - Project: **Data Display**
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-10 17:13:17

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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 <MAX30100_PulseOximeter.h> //https://github.com/gabriel-milan/Arduino-MAX30100

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void readTemperature(); // Function to read temperature
void displayTemperature(); // Function to display temperature
void countdown(); // Countdown function
void readPulseOximeter(); // Read from pulse oximeter

/***** 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 OUTPUT PHYSICAL VARIABLES *****/
float temperature = 0.0; // Variable to store temperature
unsigned long countdownStart = 0; // Start time for countdown
bool countdownActive = false; // Is countdown active?
int countdownValue = 10; // Countdown value

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Create instances for the sensors
DS18B20 ds18b20(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;

void setup(void)
{
    Serial.begin(9600);
    lcd.begin(16, 2); // Initialize LCD
    ds18b20.resetSearch(); // Prepare DS18B20 for reading
    pulseOximeter.begin(); // Initialize pulse oximeter
}

void loop(void)
{
    // Read temperature and display it
    readTemperature();
    displayTemperature();

    // Handle countdown if active
    if (countdownActive) {
        countdown();
    } else {
        // Start countdown after displaying temperature
        countdownActive = true;
        countdownStart = millis();
    }

    // Read pulse oximeter data
    readPulseOximeter();
}

void readTemperature() {
    temperature = ds18b20.getTempC(); // Read temperature
}

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

void countdown() {
    unsigned long currentMillis = millis();
    if (currentMillis - countdownStart >= 1000) { // Check if a second has passed
        countdownValue--;
        countdownStart = currentMillis; // Reset countdown start time
    }
    lcd.setCursor(0, 1); // Set cursor to second row
    lcd.print("Countdown: ");
    lcd.print(countdownValue); // Display countdown value
    if (countdownValue <= 0) {
        countdownActive = false; // Stop countdown
        countdownValue = 10; // Reset countdown value
    }
}

void readPulseOximeter() {
    pulseOximeter.update(); // Update pulse oximeter readings
    Serial.print("Heart rate: ");
    Serial.print(pulseOximeter.getHeartRate());
    Serial.print(" bpm / SpO2: ");
    Serial.println(pulseOximeter.getSpO2());
}

/* END CODE */