**Sensor Data** rev_57

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    - Project: **Sensor Data**
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-09 23:23:56

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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(); // Function to read temperature
void performCountdown(); // Function to perform countdown
void readPulseOximeter(); // Function to read pulse oximeter data

/***** 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 temperature = 0.0; // Variable to store temperature
unsigned long countdownStartTime = 0; // Variable to track countdown start time
bool countdownActive = false; // Flag to check if countdown is active
unsigned long pulseOximeterReadTime = 0; // Variable to track pulse oximeter read time

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Instantiate library objects
DS18B20 ds18b20(temperatureSensor_DS18B20_DQ_PIN_D4);
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 pulseOximeter;

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 LCD
    pulseOximeter.begin(); // Initialize Pulse Oximeter
}

void loop(void)
{
    // put your main code here, to run repeatedly:
    readTemperature(); // Read temperature from DS18B20
    if (countdownActive) {
        performCountdown(); // Perform countdown if active
    }
    readPulseOximeter(); // Read pulse oximeter data
    updateOutputs(); // Refresh output data
}

void readTemperature() {
    // Read temperature from DS18B20 sensor
    temperature = ds18b20.getTempC();
    lcd.clear();
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
    countdownStartTime = millis(); // Start countdown timer
    countdownActive = true; // Activate countdown
}

void performCountdown() {
    // Perform a countdown of 10 seconds
    unsigned long currentTime = millis();
    if (currentTime - countdownStartTime < 10000) { // 10 seconds countdown
        int remainingTime = 10 - (currentTime - countdownStartTime) / 1000; // Calculate remaining time
        lcd.setCursor(0, 1); // Move to the second line
        lcd.print("Countdown: ");
        lcd.print(remainingTime);
        lcd.print(" s");
    } else {
        countdownActive = false; // Deactivate countdown after 10 seconds
        lcd.clear(); // Clear LCD
        lcd.print("Done!");
        countdownStartTime = 0; // Reset countdown start time
    }
}

void readPulseOximeter() {
    // Read data from the pulse oximeter
    if (millis() - pulseOximeterReadTime > 1000) { // Read every second
        pulseOximeter.update();
        float heartRate = pulseOximeter.getHeartRate();
        uint8_t spo2 = pulseOximeter.getSpO2();
        lcd.setCursor(0, 0);
        lcd.print("HR: ");
        lcd.print(heartRate);
        lcd.print(" bpm");
        lcd.setCursor(0, 1);
        lcd.print("SpO2: ");
        lcd.print(spo2);
        lcd.print(" %");
        pulseOximeterReadTime = millis(); // Update read time
    }
}

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 */