0,0 → 1,181 |
/* I2C Light Sensor |
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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 - PB2 (10) |
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*/ |
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#include <Wire.h> |
#include <math.h> |
#include <SD.h> |
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#define chipSelect 10 |
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#define address 0x44 // A0 = L |
#define SENSE_VIS 0 |
#define SENSE_IR 1 |
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#define LIGHT_AUTORANGE 0 |
#define LIGHT_RANGE1 1 |
#define LIGHT_RANGE2 2 |
#define LIGHT_RANGE3 3 |
#define LIGHT_RANGE4 4 |
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int count=0; |
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void setup() |
{ |
Wire.begin(); // join i2c bus (address optional for master) |
// I2C pins PD4, PD5 |
// |
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 |
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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); |
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// 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: |
return; |
} |
Serial.println("card initialized."); |
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} |
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int data = 0; |
int light_sensor_setup; |
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void led_blink() |
{ |
digitalWrite(3, HIGH); // set the LED on |
delay(500); |
digitalWrite(3, LOW); // set the LED off |
delay(500); |
} |
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int set_light_sensor(int mode) |
{ |
int command; |
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switch (mode) |
{ |
case SENSE_VIS: |
{ |
command=0b11000000; // setup (eye light sensing; one time measurement; measurement range 1) |
break; |
} |
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case SENSE_IR: |
{ |
command=0b11100000; // setup (eye light sensing; measurement range 2 [4000 lx]) |
break; |
} |
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default: |
return 3; |
} |
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// 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 |
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// Connect to device and set register address |
Wire.beginTransmission(address); |
Wire.send(0x00); // sends address (command register) |
Wire.endTransmission(); // stop transmitting |
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// verify written command byte |
Wire.beginTransmission(address); |
Wire.requestFrom(address, 1); |
if (command != Wire.receive()) |
{ |
return 4; |
Serial.print(data, BIN); |
} |
Wire.endTransmission(); // stop transmitting |
light_sensor_setup=command; |
} |
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float get_light_measurement() |
{ |
int ret=0; |
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// Connect to device and set register address |
Wire.beginTransmission(address); |
Wire.send(0x01); // sends address of LSB reagister |
Wire.endTransmission(); // stop transmitting |
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// Connect to device and request one byte |
Wire.beginTransmission(address); |
Wire.requestFrom(address, 1); |
ret = Wire.receive(); |
Wire.endTransmission(); // stop transmitting |
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// Connect to device and set register address |
Wire.beginTransmission(address); |
Wire.send(0x02); // sends address of MSB register |
Wire.endTransmission(); // stop transmitting |
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// Connect to device and request one byte |
Wire.beginTransmission(address); |
Wire.requestFrom(address, 1); |
ret +=256 * Wire.receive(); |
Wire.endTransmission(); // stop transmitting |
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return (1000.0/pow(2.0,16)*ret); |
} |
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void loop() |
{ |
float luxVIS=0; |
float luxIR=0; |
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set_light_sensor(SENSE_VIS); //setup sensor for visible measuring |
led_blink(); // Delay for measurement |
luxVIS=get_light_measurement(); |
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set_light_sensor(SENSE_IR); // setup sensor for infrared measuring |
led_blink(); // Delay for measurement |
luxIR=get_light_measurement(); |
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// make a string for assembling the data to log: |
String dataString = "$LOG"; |
dataString += String((int)count); // print number of measurement |
dataString += ","; |
dataString += String((int)luxVIS, DEC); // print number of measurement |
dataString += ","; |
dataString += String((int)luxIR, DEC); // print number of measurement |
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// 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("datalog.txt", FILE_WRITE); |
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// if the file is available, write to it: |
if (dataFile) { |
dataFile.println(dataString); |
dataFile.close(); |
// print to the serial port too: |
Serial.println(dataString); |
count++; |
} |
// if the file isn't open, pop up an error: |
else { |
Serial.println("error opening datalog.txt"); |
} |
} |
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