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	- Project: AlcoholDetector
	- Source Code compiled for: Arduino Pro Mini 5V
	- Source Code created on: 2023-12-26 09:22:47

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* If sensor detects an alcohol percentage over a */
	/* threshold2, so activate the buzzer and led, switch */
	/* off relay and print on lcd ""Eccessive alcohol". */
/****** SYSTEM REQUIREMENT 2 *****/
	/* If sensor detects an alcohol concentrati on below */
	/* a threshold1 (that Is lower of threshold2), so */
	/* switch off the led and buzzer, maintain on the */
	/* relay and do not display anything on lcd. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include 
#include 
#include 
#include 

/****** SYSTEM PARAMETERS *****/
const int threshold1 = 100; // Threshold 1 for low alcohol concentration
const int threshold2 = 200; // Threshold 2 for high alcohol concentration

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void handleAlcoholConcentration(int alcoholConcentration);

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t Mq3_alcohol_value_PIN_A0 = A0;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t Buzzer_ActiveBuzzer_output_PIN_D2 = 2;
const uint8_t Led_LED_PIN_D3 = 3;
const uint8_t Relay_powerSupplyDCMotor_PIN_D4 = 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 = 0x27;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
MQUnifiedsensor MQ3("Arduino Pro Mini 5V", 5, 10, Mq3_alcohol_value_PIN_A0, "MQ-3");
LiquidCrystal_I2C lcd(Lcd_LCD1602I2C_I2C_SLAVE_ADDRESS, 16, 2); // Assuming you are using 16x2 LCD

void setup(void)
{
  // put your setup code here, to run once:

  pinMode(Mq3_alcohol_value_PIN_A0, INPUT);

  pinMode(Buzzer_ActiveBuzzer_output_PIN_D2, OUTPUT);
  pinMode(Led_LED_PIN_D3, OUTPUT);
  pinMode(Relay_powerSupplyDCMotor_PIN_D4, OUTPUT);

  lcd.begin(16, 2); // Initialize LCD with 16 columns and 2 rows
  lcd.backlight();
}

void loop(void)
{
  // Read alcohol concentration from the MQ-3 sensor
  MQ3.update();
  int alcoholConcentration = MQ3.readSensor();

  // Handle the alcohol concentration based on the system requirements
  handleAlcoholConcentration(alcoholConcentration);

  // Display the alcohol concentration on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Alcohol: ");
  lcd.print(alcoholConcentration);
  lcd.print(" ppm");

  delay(500);
}

void handleAlcoholConcentration(int alcoholConcentration)
{
  // If alcohol concentration is above threshold2
  if (alcoholConcentration > threshold2)
  {
    digitalWrite(Buzzer_ActiveBuzzer_output_PIN_D2, HIGH);
    digitalWrite(Led_LED_PIN_D3, HIGH);
    digitalWrite(Relay_powerSupplyDCMotor_PIN_D4, LOW);
    lcd.setCursor(0, 1);
    lcd.print("Excessive alcohol");
  }
  // If alcohol concentration is below threshold1
  else if (alcoholConcentration < threshold1)
  {
    digitalWrite(Buzzer_ActiveBuzzer_output_PIN_D2, LOW);
    digitalWrite(Led_LED_PIN_D3, LOW);
    digitalWrite(Relay_powerSupplyDCMotor_PIN_D4, HIGH);
    lcd.setCursor(0, 1);
    lcd.print("                  ");
  }
}