/* TSL25911 Digital Light Sensor */
/* Dynamic Range: 600M:1 */
/* Maximum Lux: 88K */

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include "Adafruit_TSL2591.h"

Adafruit_TSL2591 tsl = Adafruit_TSL2591(2591); // pass in a number for the sensor identifier (for your use later)


/**************************************************************************/
/*
    Configures the gain and integration time for the TSL2561
*/
/**************************************************************************/
void configureSensor(void)
{
  // You can change the gain on the fly, to adapt to brighter/dimmer light situations
  tsl.setGain(TSL2591_GAIN_LOW);    // 1x gain (bright light)
  //tsl.setGain(TSL2591_GAIN_MED);      // 25x gain
  //tsl.setGain(TSL2591_GAIN_HIGH);   // 428x gain
  
  // Changing the integration time gives you a longer time over which to sense light
  // longer timelines are slower, but are good in very low light situtations!
  tsl.setTiming(TSL2591_INTEGRATIONTIME_100MS);  // shortest integration time (bright light)
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_200MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_300MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_400MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_500MS);
  //tsl.setTiming(TSL2591_INTEGRATIONTIME_600MS);  // longest integration time (dim light)
}

/**************************************************************************/
/*
    Program entry point for the Arduino sketch
*/
/**************************************************************************/
void initLuxSensor(void) 
{   
  if (tsl.begin()) 
  {
  } 
  else 
  {
    Serial.println("No sensor found ... check your wiring?");
    while (1);
  }
  /* Configure the sensor */
  configureSensor();
}

/**************************************************************************/
/*
    Show how to read IR and Full Spectrum at once and convert to lux
*/
/**************************************************************************/
uint32_t readLuxSensor(void)
{
  // More advanced data read example. Read 32 bits with top 16 bits IR, bottom 16 bits full spectrum
  // That way you can do whatever math and comparisons you want!
  uint32_t lum = tsl.getFullLuminosity();
  uint16_t ir, full;
  ir = lum >> 16;
  full = lum & 0xFFFF;
  //Serial.print("[ "); Serial.print(millis()); Serial.print(" ms ] ");
  //Serial.print("IR: "); Serial.print(ir);  Serial.print("  ");
  //Serial.print("Full: "); Serial.print(full); Serial.print("  ");
  //Serial.print("Visible: "); Serial.print(full - ir); Serial.print("  ");
  
  uint32_t lux = tsl.calculateLux(full, ir);
  
  if ( (lux > 4294966000.0) ||
       (lux <-4294966000.0) )
  {
    return 0;
  }
  else {
    return lux;
  }
}