/Designs/Data_loggers/LuxmetrSD/SW/Arduino/luxmetr/build/luxmetr.cpp
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/* I2C Light Sensor
 
The circuit:
* analog sensors on analog ins PC0, PC1, and PC2
* SD card attached to SPI bus as follows:
** MOSI/CMD - PB3
** MISO/DAT0 - PB4
** CLK - PB5
** CS/CD/DAT3 - PD4 (4)
 
I2C pins PC4, PC5
*/
 
#include <Wire.h>
#include <math.h>
#include <stdlib.h>
#include <SD.h>
 
#define chipSelect 10 //PB2
 
#define address 0x44 // A0 = L
 
#define LIGHT_ENABLE 1
#define LIGHT_DISABLE 0
 
#define LIGHT_ONETIME 0
#define LIGHT_CONTINUOUS 1
 
#define LIGHT_SENSE_VIS 0
#define LIGHT_SENSE_IR 1
 
#define LIGHT_INTERNAL_16 0b00000000
#define LIGHT_INTERNAL_12 0b00000100
#define LIGHT_INTERNAL_8 0b00001000
#define LIGHT_INTERNAL_4 0b00001100
#define LIGHT_EXTERNAL_ADC 0b00010000
#define LIGHT_EXTERNAL_TIMER 0b00010100
 
//#define LIGHT_AUTORANGE 0
 
#define LIGHT_RANGE1 0b00000000
#define LIGHT_RANGE2 0b00000001
#define LIGHT_RANGE3 0b00000010
#define LIGHT_RANGE4 0b00000011
 
#include "WProgram.h"
void setup();
void led_blink();
int set_light_sensor(int en, int mode, int light, int res, int range);
float get_light_measurement();
void loop();
char filename[13];
 
void setup()
{
int count=0;
 
Wire.begin(); // join i2c bus (address optional for master)
 
pinMode(3, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela
pinMode(5, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela
Serial.begin(9600); // Zmerena intenzita osvetleni se bude vypisovat na seriovou linku
Serial.print("Initializing SD card...");
// make sure that the default chip select pin is set to
// output, even if you don't use it:
pinMode(10, OUTPUT);
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
while(true);
}
Serial.println("card initialized.");
Serial.print("searching for files...");
do
{
sprintf(filename,"Lux%d.txt",count);
count++;
}
while(SD.exists(filename));
Serial.print("Using ");
Serial.println(filename);
}
 
void led_blink()
{
digitalWrite(3, LOW); // set the LED off
delay(20);
digitalWrite(3, HIGH); // set the LED on
}
 
/*int light_sensor_write( unsigned int data, unsigned int address)
{
}
*/
 
 
int set_light_sensor(int en, int mode, int light, int res, int range)
{
int command=0;
 
command = (command & 0b01111111) | (en << 7);
command = (command & 0b10111111) | (mode << 6);
command = (command & 0b11011111) | (light << 5);
command = (command & 0b11100011) | (res << 2);
command = (command & 0b11111100) | (range);
 
// Setup device
Wire.beginTransmission(address);
Wire.send(0x00); // sends address
Wire.send(command); // setup (eye light sensing; one time measurement; measurement range 1)
Wire.endTransmission(); // stop transmitting
// Connect to device and set register address
Wire.beginTransmission(address);
Wire.send(0x00); // sends address (command register)
Wire.endTransmission(); // stop transmitting
// verify written command byte
Wire.beginTransmission(address);
Wire.requestFrom(address, 1);
if (command != Wire.receive())
{
Serial.println("Error in sensor setting");
return 4;
}
Wire.endTransmission(); // stop transmitting
return 0;
}
 
float get_light_measurement()
{
unsigned int ret=0;
unsigned int setting=0; // variable to storage readed settings
 
unsigned long int resolution; // parsed ADC bit resolution
unsigned int range; // parsed measurement range
 
// Connect to device and set register address
Wire.beginTransmission(address);
Wire.send(0x01); // sends address of LSB reagister
Wire.endTransmission(); // stop transmitting
// Connect to device and request first byte
Wire.beginTransmission(address);
Wire.requestFrom(address, 1);
ret = Wire.receive();
Wire.endTransmission(); // stop transmitting
// Connect to device and set register address
Wire.beginTransmission(address);
Wire.send(0x02); // sends address of MSB register
Wire.endTransmission(); // stop transmitting
// Connect to device and request second byte
Wire.beginTransmission(address);
Wire.requestFrom(address, 1);
ret +=256 * Wire.receive();
Wire.endTransmission(); // stop transmitting
 
 
// Connect to device and set register address
Wire.beginTransmission(address);
Wire.send(0x00); // sends address (command register)
Wire.endTransmission(); // stop transmitting
// get sensor setting
Wire.beginTransmission(address);
Wire.requestFrom(address, 1);
setting = Wire.receive();
Wire.endTransmission(); // stop transmitting
switch (setting & 0b00011100) // determine ADC resolution
{
case LIGHT_INTERNAL_16:
resolution=65536;
break;
case LIGHT_INTERNAL_12:
resolution=4096;
break;
case LIGHT_INTERNAL_8:
resolution=256;
break;
case LIGHT_INTERNAL_4:
resolution=16;
break;
}
switch (setting & 0b00000011) // determine measurement range
{
case LIGHT_RANGE1:
range=1000;
break;
case LIGHT_RANGE2:
range=4000;
break;
case LIGHT_RANGE3:
range=16000;
break;
case LIGHT_RANGE4:
range=64000;
break;
}
return ((500000.0*range)/(510000.0*resolution)*ret); // calculate output value
}
 
void loop()
{
float luxVIS=0;
float luxIR=0;
float time;
 
set_light_sensor(LIGHT_ENABLE, LIGHT_ONETIME, LIGHT_SENSE_VIS, LIGHT_INTERNAL_16, LIGHT_RANGE3); //setup sensor for visible measuring
led_blink(); // Delay for measurement
delay(500);
luxVIS=get_light_measurement();
 
time=millis()/1000.0;
set_light_sensor(LIGHT_ENABLE, LIGHT_ONETIME, LIGHT_SENSE_IR, LIGHT_INTERNAL_16, LIGHT_RANGE3); // setup sensor for infrared measuring
led_blink(); // Delay for measurement
delay(500);
luxIR=get_light_measurement();
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open(filename, FILE_WRITE);
 
// if the file is available, write to it:
if (dataFile) {
dataFile.print("$LUX0.1 ");
dataFile.print(time,3);
dataFile.print(" ");
dataFile.print(luxVIS,3);
dataFile.print(" ");
dataFile.println(luxIR,3);
dataFile.close();
// print to the serial port too:
Serial.print("$LUX0.1 ");
Serial.print(time,3);
Serial.print(" ");
Serial.print(luxVIS,3);
Serial.print(" ");
Serial.println(luxIR,3);
}
// if the file isn't open, pop up an error:
else {
Serial.print("error opening ");
Serial.println(filename);
}
delay(2000);
}