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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 
#include 	//https://github.com/matmunk/DS18B20
#include 	//https://github.com/arduino-libraries/LiquidCrystal
#include 	//https://github.com/adafruit/DHT-sensor-library
#include 	//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 */