**Sensor Data** rev_60

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    - Project: **Sensor Data**
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-10 17:03:19

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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 readTemperatureAndDisplay();
void countdownTimer();

/***** 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 RAW VARIABLES *****/
bool    myLCD_LCD1602_RS_PIN_D3_rawData     = 0;
bool    myLCD_LCD1602_D4_PIN_D5_rawData     = 0;
bool    myLCD_LCD1602_D5_PIN_D6_rawData     = 0;
bool    myLCD_LCD1602_D6_PIN_D7_rawData     = 0;
bool    myLCD_LCD1602_D7_PIN_D8_rawData     = 0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Instantiate the DS18B20 sensor
DS18B20 ds(temperatureSensor_DS18B20_DQ_PIN_D4);
// Instantiate the LiquidCrystal display
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);
// Instantiate the PulseOximeter
PulseOximeter pulseOximeter;

unsigned long previousMillis = 0; // Store last time temperature was read
const long interval = 10000; // Interval for reading temperature (10 seconds)
bool timerActive = false; // Timer status
int countdown = 10; // Countdown variable
unsigned long countdownMillis = 0; // Store last time countdown was updated

void setup(void)
{
    // put your setup code here, to run once:

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

    pinMode(myLCD_LCD1602_RS_PIN_D3,     OUTPUT);
    pinMode(myLCD_LCD1602_D4_PIN_D5,     OUTPUT);
    pinMode(myLCD_LCD1602_D5_PIN_D6,     OUTPUT);
    pinMode(myLCD_LCD1602_D6_PIN_D7,     OUTPUT);
    pinMode(myLCD_LCD1602_D7_PIN_D8,     OUTPUT);

    lcd.begin(16, 2); // Initialize the LCD
    pulseOximeter.begin(); // Initialize the Pulse Oximeter
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    unsigned long currentMillis = millis();

    // Check if it's time to read the temperature
    if (currentMillis - previousMillis >= interval) {
        previousMillis = currentMillis; // Save the last time temperature was read
        readTemperatureAndDisplay(); // Read temperature and display it
        timerActive = true; // Activate the countdown timer
        countdown = 10; // Reset countdown
        countdownMillis = currentMillis; // Reset countdown timer
    }

    // If the timer is active, perform countdown
    if (timerActive) {
        countdownTimer(currentMillis);
    }

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

void readTemperatureAndDisplay() {
    float temperature = ds.getTempC(); // Get temperature in Celsius
    lcd.clear(); // Clear the LCD
    lcd.print("Temp: "); // Display temperature label
    lcd.print(temperature); // Display temperature value
    lcd.print(" C"); // Display unit
}

void countdownTimer(unsigned long currentMillis) {
    if (currentMillis - countdownMillis >= 1000) { // Check if 1 second has passed
        countdownMillis = currentMillis; // Reset the countdown timer
        if (countdown > 0) {
            lcd.setCursor(0, 1); // Set cursor to the second line
            lcd.print("Countdown: "); // Display countdown label
            lcd.print(countdown); // Display countdown value
            countdown--; // Decrement countdown
        } else {
            timerActive = false; // Deactivate the timer
        }
    }
}

void updateOutputs() {
    digitalWrite(myLCD_LCD1602_RS_PIN_D3, myLCD_LCD1602_RS_PIN_D3_rawData);
    digitalWrite(myLCD_LCD1602_D4_PIN_D5, myLCD_LCD1602_D4_PIN_D5_rawData);
    digitalWrite(myLCD_LCD1602_D5_PIN_D6, myLCD_LCD1602_D5_PIN_D6_rawData);
    digitalWrite(myLCD_LCD1602_D6_PIN_D7, myLCD_LCD1602_D6_PIN_D7_rawData);
    digitalWrite(myLCD_LCD1602_D7_PIN_D8, myLCD_LCD1602_D7_PIN_D8_rawData);
}

/* END CODE */