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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 */