New library for TCS230 RGB Color Sensor

Using Arduino Sensors
2

Thanks for sharing! you're good in libs! Well done,

Some small remarks to think over

typedef struct
{
	uint32_t value[RGB_SIZE];	// Raw data from the sensor
} color32;

typedef struct
{
	uint8_t	value[RGB_SIZE]; // the evaluated colour data (RGB value 0-255 or other)
} color8;

void	setEnable(bool t);		// enable the device (using OE or frequency)
=>
void enable();
void disable();

Choose better names for some variables,
keeps the code more readable / maintainable
and you can remove comments as code becomes self documenting

e.g.

	uint8_t	_OutputEnable;
	uint8_t	_FreqScaler0, _FreqScaler1;	
	color32	_DarkCalibration;
	color32	_WhiteBalance;
	color32	_currentRaw;
	color8	_currectRGB;

also for the function prototypes

MD_TCS230(... uint8_t freqScaler0, uint8_t freqScaler1, uint8_t outputEnable);

Have a look at error handling and return values. It is only slightly more code and adds real value

bool MD_TCS230::setFilter(uint8_t f)
// set the sensor color filter
{
	if ((_S2 == NO_PIN) || (_S3 == NO_PIN))
		return false;

	DUMPS("\nsetFilter ");
	switch (f)
	{
	case TCS230_RGB_R:	DUMPS("R");	digitalWrite(_S2, LOW);		digitalWrite(_S3, LOW);		break;
	case TCS230_RGB_G:	DUMPS("G");	digitalWrite(_S2, HIGH);	digitalWrite(_S3, HIGH);	break;
	case TCS230_RGB_B:	DUMPS("B");	digitalWrite(_S2, LOW);		digitalWrite(_S3, HIGH);	break;
	case TCS230_RGB_X:	DUMPS("X");	digitalWrite(_S2, HIGH);	digitalWrite(_S3, LOW);		break;
	default:	DUMPS("setFilter error");	Serial.println(f, DEC); return false; break;   
	}
	return true;
}

or

bool MD_TCS230::setSampling(uint8_t t)
// set sampling rate divisor for frequency counter
{
	if (t > 0) 
	{
	   _readDiv =  t;
	   return true;
	   }
	return false;
}

or

bool MD_TCS230::setDarkCal(sensorData *d)
// set dark calibration data for rgb calculations
{
	if (d == NULL)
		return false;

	DUMPS("\nsetDarkCal");
	for (uint8_t i=0; i<RGB_SIZE; i++)
	{
		DUMP(" ", d->value[i]);
		_Fd.value[i] = d->value[i];
	}
	return true;
}

BTW I like your consequent debugging style!