Temperature Countdown rev_72

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    - Project: Temperature Countdown
    - Source Code compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-13 10:30:11

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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_E_PIN_D5        = 5;
const uint8_t myLCD_LCD1602_D4_PIN_D6       = 6;
const uint8_t myLCD_LCD1602_D5_PIN_D7       = 7;
const uint8_t myLCD_LCD1602_D6_PIN_D8       = 8;
const uint8_t myLCD_LCD1602_D7_PIN_D10      = 10;

/***** DEFINITION OF OUTPUT RAW VARIABLES *****/
bool    myLCD_LCD1602_RS_PIN_D3_rawData     = 0;
bool    myLCD_LCD1602_E_PIN_D5_rawData      = 0;
bool    myLCD_LCD1602_D4_PIN_D6_rawData     = 0;
bool    myLCD_LCD1602_D5_PIN_D7_rawData     = 0;
bool    myLCD_LCD1602_D6_PIN_D8_rawData     = 0;
bool    myLCD_LCD1602_D7_PIN_D10_rawData        = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
float   myLCD_LCD1602_RS_PIN_D3_phyData     = 0.0;
float   myLCD_LCD1602_E_PIN_D5_phyData      = 0.0;
float   myLCD_LCD1602_D4_PIN_D6_phyData     = 0.0;
float   myLCD_LCD1602_D5_PIN_D7_phyData     = 0.0;
float   myLCD_LCD1602_D6_PIN_D8_phyData     = 0.0;
float   myLCD_LCD1602_D7_PIN_D10_phyData        = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// DS18B20 temperature sensor instance
DS18B20 ds(temperatureSensor_DS18B20_DQ_PIN_D4);
// LiquidCrystal instance
LiquidCrystal lcd(myLCD_LCD1602_RS_PIN_D3, myLCD_LCD1602_E_PIN_D5, myLCD_LCD1602_D4_PIN_D6, myLCD_LCD1602_D5_PIN_D7, myLCD_LCD1602_D6_PIN_D8, myLCD_LCD1602_D7_PIN_D10);
// MAX30100 pulse oximeter instance
PulseOximeter pox;

unsigned long previousMillis = 0; // Store last time temperature was read
const long interval = 10000; // Interval to read temperature (10 seconds)
int countdown = 10; // Countdown timer

void setup(void)
{
    // Initialize pins
    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_E_PIN_D5, OUTPUT);
    pinMode(myLCD_LCD1602_D4_PIN_D6, OUTPUT);
    pinMode(myLCD_LCD1602_D5_PIN_D7, OUTPUT);
    pinMode(myLCD_LCD1602_D6_PIN_D8, OUTPUT);
    pinMode(myLCD_LCD1602_D7_PIN_D10, OUTPUT);

    // Initialize the LCD
    lcd.begin(16, 2);
    // Initialize the pulse oximeter
    if (!pox.begin()) {
        lcd.print("MAX30100 Error");
        while (1);
    }
}

void loop(void)
{
    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
        readTemperature(); // Read temperature
        displayCountdown(countdown); // Display countdown
    }

    updateOutputs(); // Refresh output data
}

void readTemperature()
{
    float temperature = ds.getTempC(); // Get temperature in Celsius
    lcd.clear();
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print(" C");
}

void displayCountdown(int seconds)
{
    for (int i = seconds; i > 0; i--) {
        lcd.setCursor(0, 1); // Set cursor to second line
        lcd.print("Countdown: ");
        lcd.print(i);
        delay(1000); // Wait for 1 second
    }
    lcd.clear(); // Clear the display after countdown
}

void updateOutputs()
{
    // Update LCD display outputs
    digitalWrite(myLCD_LCD1602_RS_PIN_D3, myLCD_LCD1602_RS_PIN_D3_rawData);
    digitalWrite(myLCD_LCD1602_E_PIN_D5, myLCD_LCD1602_E_PIN_D5_rawData);
    digitalWrite(myLCD_LCD1602_D4_PIN_D6, myLCD_LCD1602_D4_PIN_D6_rawData);
    digitalWrite(myLCD_LCD1602_D5_PIN_D7, myLCD_LCD1602_D5_PIN_D7_rawData);
    digitalWrite(myLCD_LCD1602_D6_PIN_D8, myLCD_LCD1602_D6_PIN_D8_rawData);
    digitalWrite(myLCD_LCD1602_D7_PIN_D10, myLCD_LCD1602_D7_PIN_D10_rawData);
}

/* END CODE */