**Countdown Display** rev_55

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    - Project: **Countdown Display**
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-09 23:09:33

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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(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 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 OUTPUT PHYSICAL VARIABLES *****/
float   myLCD_LCD1602_RS_PIN_D3_phyData     = 0.0;
float   myLCD_LCD1602_D4_PIN_D5_phyData     = 0.0;
float   myLCD_LCD1602_D5_PIN_D6_phyData     = 0.0;
float   myLCD_LCD1602_D6_PIN_D7_phyData     = 0.0;
float   myLCD_LCD1602_D7_PIN_D8_phyData     = 0.0;

/****** 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;

/****** VARIABLES FOR COUNTDOWN TIMER *****/
unsigned long previousMillis = 0; // Store last time countdown was updated
int countdownTime = 10; // Countdown time in seconds
bool countdownActive = false;

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);

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

void loop(void)
{
    // put your main code here, to run repeatedly:
    updateOutputs(); // Refresh output data
    readTemperature(); // Read temperature from DS18B20

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

    // Check if countdown is active
    if (countdownActive) {
        unsigned long currentMillis = millis();
        if (currentMillis - previousMillis >= 1000) { // Check if a second has passed
            previousMillis = currentMillis;
            countdownTime--;
            if (countdownTime <= 0) {
                countdownActive = false; // Stop countdown
            }
        }
    }

    // Display countdown if active
    if (countdownActive) {
        displayCountdown(countdownTime);
    }
}

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);
}

void readTemperature()
{
    // Start temperature conversion
    ds.doConversion();
    // Read temperature in Celsius
    float temperature = ds.getTempC();
    // Display temperature on LCD
    lcd.clear();
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
    // Start countdown after reading temperature
    countdownTime = 10; // Reset countdown time
    countdownActive = true; // Start countdown
}

void displayCountdown(int seconds)
{
    lcd.setCursor(0, 1); // Set cursor to the second line
    lcd.print("Countdown: ");
    lcd.print(seconds);
}

/* END CODE */