**Data Monitor** rev_42

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    - Project: **Data Monitor**
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-07 23:02:34

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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
#include <dht11esp8266.h>   //https://github.com/Adish0016/dht11esp8266

/****** 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 *****/
float temperature = 0.0;
unsigned long previousMillis = 0; // Store last time temperature was read
const long interval = 1000; // Interval for reading temperature (1 second)

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Create instances for the LCD and Pulse Oximeter
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;

void setup(void)
{
    // put your setup code here, to run once:
    lcd.begin(16, 2); // Initialize the LCD
    Serial.begin(115200); // Initialize serial communication

    // Initialize Pulse Oximeter
    if (!pox.begin()) {
        Serial.println("Failed to initialize Pulse Oximeter");
        while (1);
    }
    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)
{
    // Non-blocking code to read temperature every second
    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= interval) {
        previousMillis = currentMillis;
        readTemperature(); // Read temperature
        displayCountdown(10); // Display countdown
    }

    pox.update(); // Update Pulse Oximeter readings
    // Display heart rate and SpO2 on the serial monitor
    Serial.print("Heart rate: ");
    Serial.print(pox.getHeartRate());
    Serial.print(" bpm / SpO2: ");
    Serial.print(pox.getSpO2());
    Serial.println(" %");
}

void readTemperature() {
    // Read temperature from DS18B20 sensor
    temperature = DS18B20::GetTemperature<float>(temperatureSensor_DS18B20_DQ_PIN_D4);
    lcd.clear();
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
}

void displayCountdown(int seconds) {
    for (int i = seconds; i > 0; i--) {
        lcd.setCursor(0, 1); // Set cursor to second line
        lcd.print("Countdown: ");
        lcd.print(i);
        delay(1000); // Wait for 1 second
    }
}

/* END CODE */