Temperature Monitor rev_01

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    - Project: Temperature Monitor
    - Source Code compiled for: Arduino Uno
    - Source Code created on: 2024-03-01 04:50:20

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Turn on the  red LED when D2 is above a threshold */
    /* , turn on green LED when D2 is below a threshold. */
/****** SYSTEM REQUIREMENT 2 *****/
    /* take D2 readings once a day */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <LiquidCrystal_I2C.h> //https://github.com/marcoschwartz/LiquidCrystal_I2C
#include <DS18B20.h> //https://github.com/matmunk/DS18B20

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t moistureSens_DS18B20_DQ_PIN_D2 = 2;

/***** DEFINITION OF LED PINS *****/
const uint8_t redLED_PIN = 3;
const uint8_t greenLED_PIN = 4;

/***** DEFINITION OF I2C PINS *****/
const uint8_t LCD_LCD1602I2C_I2C_PIN_SDA_A4 = A4;
const uint8_t LCD_LCD1602I2C_I2C_PIN_SCL_A5 = A5;
const uint8_t LCD_LCD1602I2C_I2C_SLAVE_ADDRESS = 39;

/****** DEFINITION OF LIBRARY CLASS INSTANCES*****/
LiquidCrystal_I2C lcd(LCD_LCD1602I2C_I2C_SLAVE_ADDRESS, 16, 2); // Initialize LiquidCrystal_I2C object with LCD address, number of columns, and number of rows
DS18B20 ds(moistureSens_DS18B20_DQ_PIN_D2); // Initialize DS18B20 object with DQ pin

/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
const float LOW_ALARM = 20.0; // Low temperature threshold
const float HIGH_ALARM = 25.0; // High temperature threshold

/****** SYSTEM REQUIREMENT 2 *****/
const unsigned long READ_INTERVAL = 86400000; // Read temperature once a day (24 hours)

void setup(void)
{
  pinMode(moistureSens_DS18B20_DQ_PIN_D2, INPUT);
  pinMode(redLED_PIN, OUTPUT);
  pinMode(greenLED_PIN, OUTPUT);

  lcd.begin(16, 2);        // Initialize the LCD
  lcd.setBacklight(HIGH);  // Turn on the backlight
  lcd.clear();             // Clear the LCD screen
  lcd.print("Hello World!"); // Print a message on the LCD screen
}

void loop(void)
{
  // Read temperature once a day
  delay(READ_INTERVAL);

  float temperature = ds.getTempC();

  // Check if temperature is above threshold
  if (temperature > HIGH_ALARM)
  {
    digitalWrite(redLED_PIN, HIGH); // Turn on the red LED
    digitalWrite(greenLED_PIN, LOW); // Turn off the green LED
  }
  // Check if temperature is below threshold
  else if (temperature < LOW_ALARM)
  {
    digitalWrite(redLED_PIN, LOW); // Turn off the red LED
    digitalWrite(greenLED_PIN, HIGH); // Turn on the green LED
  }
  // Temperature is within the threshold
  else
  {
    digitalWrite(redLED_PIN, LOW); // Turn off the red LED
    digitalWrite(greenLED_PIN, LOW); // Turn off the green LED
  }
}