2 channels light sensor (Broadband+IR) based on Arduino board + TSL2561 sensor

luminosity_2_channels.ino

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_TSL2561_U.h>
   
Adafruit_TSL2561_Unified tsl = Adafruit_TSL2561_Unified(TSL2561_ADDR_FLOAT, 12345);

void displaySensorDetails(void)
{
  sensor_t sensor;
  tsl.getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" lux");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" lux");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" lux");  
  Serial.println("------------------------------------");
  Serial.println("");
  delay(500);
}

/**************************************************************************/
/* Configures the gain and integration time for the TSL2561  */
/**************************************************************************/
void configureSensor(void)
{
  /* You can also manually set the gain or enable auto-gain support */
  //tsl.setGain(TSL2561_GAIN_1X);      /* No gain ... use in bright light to avoid sensor saturation */
  //tsl.setGain(TSL2561_GAIN_16X);     /* 16x gain ... use in low light to boost sensitivity */
  tsl.enableAutoRange(true);            /* Auto-gain ... switches automatically between 1x and 16x */
  
  /* Changing the integration time gives you better sensor resolution (402ms = 16-bit data) */
  //tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_13MS);      /* fast but low resolution */
  //tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_101MS);  /* medium resolution and speed   */
  tsl.setIntegrationTime(TSL2561_INTEGRATIONTIME_402MS);  /* 16-bit data but slowest conversions */
}


void setup(void) 
{
  Serial.begin(9600);
  Serial.println("Light Sensor Test"); Serial.println("");
  
  /* Initialise the sensor */
  if(!tsl.begin())
  {
    /* There was a problem detecting the ADXL345 ... check your connections */
    Serial.print("Ooops, no TSL2561 detected ... Check your wiring or I2C ADDR!");
    while(1);
  }
  
  /* Display some basic information on this sensor */
  displaySensorDetails();
  
  /* Setup the sensor gain and integration time */
  configureSensor();
  
  /* We're ready to go! */
  Serial.println("");
}

/**************************************************************************/
/* Arduino loop function, called once 'setup' is complete  */
/**************************************************************************/
void loop(void) 
{  
  /* Get a new sensor event */ 
  sensors_event_t event;
  tsl.getEvent(&event);
 
  /* Display the results (light is measured in lux) */
  /* Each line should look like 
     "139.00 lux,906 Broad raw,414 IR raw,14496 Broad,6624 IR"
  */
  Serial.print(event.light); Serial.print(" lux,");
  Serial.print(event.countBroadband); Serial.print(" Broad raw,");
  Serial.print(event.countIR); Serial.print(" IR raw,");
  Serial.print(event.channelBroadband); Serial.print(" Broad,");
  Serial.print(event.channelIR); Serial.println(" IR");

  delay(250);
}

read_luminosity.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
# Pierre Haessig — January 2015
""" Read luminosity data from the TSL2561 sensor
connected to the Arduino board

(with the luminosity_2_channels.ino sketch loaded)
"""

from __future__ import print_function

import serial

ser = serial.Serial('/dev/ttyACM0')

logfile = 'luminosity_log.csv'

print('writing data to "{:s}"'.format(logfile))

with open(logfile, 'w') as out:
    while True:
        line = ser.readline().strip()
        print(line)

        csv_split = line.split(',')
        if len(csv_split) != 5:
            print('skipping line')
            continue
        # csv_split should look like
        # ['238.00 lux', '2224 Broad raw', '1074 IR raw', '35584 Broad', '17184 IR']
        lux, broad_raw, ir_raw, broad, ir = csv_split
        line = lux[:-4] + ',' + broad_raw[:-10] + ',' + ir_raw[:-7] +',' + broad[:-6] + ',' + ir[:-3]
        out.write(line)
        out.write('\n')