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	- Project: "Hydrogen Sensor"
	- Source Code NOT compiled for: Arduino Mega
	- Source Code created on: 2024-06-20 14:50:21

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Create an Arduino project utilizing the */
	/* MQUnifiedsensor library to read and process data */
	/* from an MQ-8 hydrogen sensor. Implement functions */
	/* to convert raw analog data from pin A0 to physical */
	/* values and ensure real-time updates in the loop. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include  // https://github.com/miguel5612/MQSensorsLib

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateInputs();
void convertInputsFromRawToPhyData();
float lookup_phyData_from_voltage(float voltage, int segment_points, const float* voltage_phyData_lookup);
float map_f(float x, float in_min, float in_max, float out_min, float out_max);

/***** DEFINITION OF ANALOG INPUT PINS *****/
const uint8_t H2Sensor_MQ8_AOUT_PIN_A0 = A0;

/****** DEFINITION OF ANALOG INPUTS CHARACTERISTIC CURVES *****/
const uint8_t SEGMENT_POINTS_voltage__PIN_A0 = 1;
const float voltage__PIN_A0_lookup[2][SEGMENT_POINTS_voltage__PIN_A0] =
{
  {0.0}, // Voltage [V]
  {0.0}  // []
};

/***** DEFINITION OF INPUT RAW VARIABLES *****/
/***** used to store raw data *****/
unsigned int H2Sensor_MQ8_AOUT_PIN_A0_rawData = 0; // Analog Input

/***** DEFINITION OF INPUT PHYSICAL VARIABLES *****/
/***** used to store data after characteristic curve transformation *****/
float H2Sensor_MQ8_AOUT_PIN_A0_phyData = 0.0; // []

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Definitions for MQ8 sensor
#define placa "Arduino UNO"
#define Voltage_Resolution 5
#define pin A0
#define type "MQ-8"
#define ADC_Bit_Resolution 10
#define RatioMQ8CleanAir 70

// Declare Sensor
MQUnifiedsensor MQ8(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);

void setup(void)
{
  // put your setup code here, to run once:
  pinMode(H2Sensor_MQ8_AOUT_PIN_A0, INPUT);

  Serial.begin(9600); // Init serial port

  // Set math model and constants for H2 concentration
  MQ8.setRegressionMethod(1);
  MQ8.setA(976.97);
  MQ8.setB(-0.688);

  MQ8.init(); // Initialize sensor

  // Calibration
  Serial.print("Calibrating please wait.");
  float calcR0 = 0;
  for (int i = 1; i <= 10; i++) {
    MQ8.update();
    calcR0 += MQ8.calibrate(RatioMQ8CleanAir);
    Serial.print(".");
  }
  MQ8.setR0(calcR0 / 10);
  Serial.println("  done!");

  if (isinf(calcR0) || calcR0 == 0) {
    Serial.println("Warning: Connection issue detected, please check your wiring and supply");
    while (1);
  }

  MQ8.serialDebug(true);
}

void loop(void)
{
  // put your main code here, to run repeatedly:
  updateInputs(); // Refresh input data
  convertInputsFromRawToPhyData(); // Transform raw data to physical data according to characteristic curve

  MQ8.update();
  MQ8.readSensor();
  MQ8.serialDebug();
  delay(500);
}

void updateInputs()
{
  H2Sensor_MQ8_AOUT_PIN_A0_rawData = analogRead(H2Sensor_MQ8_AOUT_PIN_A0);
}

/* BLOCK lookup_phyData_from_voltage */
float lookup_phyData_from_voltage(float voltage, int segment_points, const float* voltage_phyData_lookup)
{
	// Search table for appropriate value.
	uint8_t index = 0;

	const float *voltagePointer = &voltage_phyData_lookup[0];
	const float *phyDataPointer = &voltage_phyData_lookup[segment_points];

	// Perform minimum and maximum voltage saturation based on characteristic curve
	voltage = min(voltage, voltagePointer[segment_points-1]);
	voltage = max(voltage, voltagePointer[0]);

	while( voltagePointer[index] <= voltage && index < segment_points )
		index++;

	// If index is zero, physical value is smaller than our table range
	if( index==0 )
	{
		return map_f( voltage,
			voltagePointer[0],   // X1
			voltagePointer[1],   // X2
			phyDataPointer[0],   // Y1
			phyDataPointer[1] ); // Y2
	}
	// If index is maxed out, phyisical value is larger than our range.
	else if( index==segment_points )
	{
		return map_f( voltage,
			voltagePointer[segment_points-2],   // X1
			voltagePointer[segment_points-1],   // X2
			phyDataPointer[segment_points-2],   // Y1
			phyDataPointer[segment_points-1] ); // Y2
	}
	// index is between 0 and max, just right
	else
	{
		return map_f( voltage,
			voltagePointer[index-1], // X1
			voltagePointer[index],    // X2
			phyDataPointer[index-1], // Y1
			phyDataPointer[index] );  // Y2
	}
}
/* END BLOCK lookup_phyData_from_voltage */

/* BLOCK map_f */
float map_f(float x, float in_min, float in_max, float out_min, float out_max)
{
	return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}
/* END BLOCK map_f */

/* BLOCK convertInputsFromRawToPhyData */
void convertInputsFromRawToPhyData()
{
	float voltage = 0.0;

	voltage = H2Sensor_MQ8_AOUT_PIN_A0_rawData * (5.0 / 1023.0);
	H2Sensor_MQ8_AOUT_PIN_A0_phyData = lookup_phyData_from_voltage(voltage, SEGMENT_POINTS_voltage__PIN_A0, &(voltage__PIN_A0_lookup[0][0]));

}
/* END BLOCK convertInputsFromRawToPhyData */

/* END CODE */