Sensor Controller rev_02

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    - Project: Sensor Controller
    - Source Code compiled for: Arduino Opta WiFi
    - Source Code created on: 2025-08-04 23:34:26

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Implement a gas detection alert system on Arduino */
    /* Opta WiFi, utilizing MQ3 sensor for alcohol */
    /* detection and potentiometer for sensitivity */
    /* adjustment, with RGB LED indicators for alert */
    /* status. */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */
/****** DEFINITION OF LIBRARIES *****/
// No external libraries are used in this project.

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

// ***** DEFINITION OF ANALOG INPUT PINS *****
const uint8_t mq3_MQ3_AOUT_PIN_A0 = A0;
const uint8_t pot_Potentiometer_Vout_PIN_A2 = A2;

// ***** DEFINITION OF DIGITAL OUTPUT PINS *****
const uint8_t led_LEDRGB_Red_PIN_D0 = 0;
const uint8_t led_LEDRGB_Green_PIN_D1 = 1;
const uint8_t led_LEDRGB_Blue_PIN_D2 = 2;

// ***** DEFINITION OF OUTPUT RAW VARIABLES *****
/***** used to store raw data *****/
bool led_LEDRGB_Red_PIN_D0_rawData = 0;
bool led_LEDRGB_Green_PIN_D1_rawData = 0;
bool led_LEDRGB_Blue_PIN_D2_rawData = 0;

// ***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****
/***** used to store data after characteristic curve transformation *****/
float led_LEDRGB_Red_PIN_D0_phyData = 0.0;
float led_LEDRGB_Green_PIN_D1_phyData = 0.0;
float led_LEDRGB_Blue_PIN_D2_phyData = 0.0;

// Additional variables for gas detection
float gasThreshold = 0.5; // Default threshold, can be adjusted via potentiometer
float gasSensorValue = 0.0;

void setup(void)
{
  // Initialize serial communication for debugging
  Serial.begin(9600);

  // Configure pins
  pinMode(mq3_MQ3_AOUT_PIN_A0, INPUT);
  pinMode(pot_Potentiometer_Vout_PIN_A2, INPUT);

  pinMode(led_LEDRGB_Red_PIN_D0, OUTPUT);
  pinMode(led_LEDRGB_Green_PIN_D1, OUTPUT);
  pinMode(led_LEDRGB_Blue_PIN_D2, OUTPUT);
}

void loop(void)
{
  // Read the potentiometer for sensitivity adjustment
  int potValue = analogRead(pot_Potentiometer_Vout_PIN_A2);
  // Map potentiometer value (0-1023) to a threshold range (e.g., 0.1 to 1.0)
  gasThreshold = map(potValue, 0, 1023, 10, 100) / 100.0;

  // Read the MQ3 sensor value
  int sensorReading = analogRead(mq3_MQ3_AOUT_PIN_A0);
  // Convert sensor reading to voltage (assuming 5V ADC reference)
  float sensorVoltage = sensorReading * (5.0 / 1023.0);

  // For simplicity, normalize sensor voltage to a 0-1 range
  gasSensorValue = sensorVoltage / 5.0;

  // Determine if gas level exceeds threshold
  if (gasSensorValue >= gasThreshold)
  {
    // Gas detected - turn on red LED
    led_LEDRGB_Red_PIN_D0_rawData = HIGH;
    led_LEDRGB_Green_PIN_D1_rawData = LOW;
    led_LEDRGB_Blue_PIN_D2_rawData = LOW;
  }
  else
  {
    // No gas detected - turn on green LED
    led_LEDRGB_Red_PIN_D0_rawData = LOW;
    led_LEDRGB_Green_PIN_D1_rawData = HIGH;
    led_LEDRGB_Blue_PIN_D2_rawData = LOW;
  }

  // Update physical data if needed (here we directly use rawData for simplicity)
  updateOutputs();

  // Optional: print values for debugging
  Serial.print("Gas Sensor Value: ");
  Serial.print(gasSensorValue);
  Serial.print(" Threshold: ");
  Serial.println(gasThreshold);

  delay(200); // Delay for stability
}

void updateOutputs()
{
  digitalWrite(led_LEDRGB_Red_PIN_D0, led_LEDRGB_Red_PIN_D0_rawData);
  digitalWrite(led_LEDRGB_Green_PIN_D1, led_LEDRGB_Green_PIN_D1_rawData);
  digitalWrite(led_LEDRGB_Blue_PIN_D2, led_LEDRGB_Blue_PIN_D2_rawData);
}