Precise Lux Measurement – TSL2561

				
					#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_TSL2561_U.h>

//Create a sensor object and specify a unique ID and display name
Adafruit_TSL2561_Unified tsl = Adafruit_TSL2561_Unified(TSL2561_ADDR_FLOAT, 12345);
//"TSL2561_ADDR_FLOAT" is the address (0x39) when ADDR_SEL is left floating. 
//It can be changed to TSL2561_ADDR_LOW (0x29) or TSL2561_ADDR_HIGH (0x49).
//12345 is the device ID and can be customized.
  int a;
  int b;
  int c;
  int ch0=0;
  int ch1=1;
  int ch2=2;
//Channel Settings
void setup() {
  Serial.begin(9600);
  if(!tsl.begin()) { // Initialize Sensor
    Serial.println("Sensor TSL2561 not found!");
    while(1);
  }
  
  // Configure sensor gain and integration time
  tsl.enableAutoRange(true);          // Automatic gain switching (use high gain in low light).
  
  //Manual gain setting requires disabling automatic gain. You can choose either 1x or 16x.
  //tsl.setGain(TSL2561_GAIN_1X);
  
  //Set the integration time. Options include 13ms, 101ms, and 402ms.
  tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_402MS); // Longer integration time results in higher precision.
}

void loop() {
  sensors_event_t event;//Receive Structure
  tsl.getEvent(&event); // Get Sensor Event
  
  tsl.getLuminosity(&ch0,&a);//Read the value of channel 0 and assign it to A.
  Serial.print("full: ");
  Serial.print(a);
  //Full Spectrum
  
  tsl.getLuminosity(&ch1,&b);
  Serial.print("   IR: ");
  Serial.print(b);
  //Infrared Spectrum
  
  tsl.getLuminosity(&ch2,&c);
  Serial.print("   visible: ");
  Serial.println(c);
  //Visible Light Estimate
  
  if (event.light) {
    Serial.print("Illuminance: ");
    Serial.print(event.light);
    Serial.println(" lux");
  } else {
    Serial.println("Error");
  }
  delay(100);
  
  
}