| 0,0 → 1,260 |
|---|
| /* I2C Light Sensor |
| |
| The circuit: |
| * SD card attached to SPI bus as follows: |
| ** MOSI/CMD - PB3 |
| ** MISO/DAT0 - PB4 |
| ** CLK - PB5 |
| ** CS/CD/DAT3 - PD4 |
| |
| 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 |
| |
| 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.println("LABduino SD card logging luxmeter - (c) MLAB.cz, kaklik 2012"); |
| 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, HIGH); // set the LED on |
| delay(20); |
| digitalWrite(3, LOW); // set the LED off |
| |
| // 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.write(byte(0x00)); // sends address |
| Wire.write(byte(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.write(byte(0x00)); // sends address (command register) |
| Wire.endTransmission(); // stop transmitting |
| // verify written command byte |
| Wire.beginTransmission(address); |
| Wire.requestFrom(address, 1); |
| if (command != Wire.read()) |
| { |
| 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.write(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.read(); |
| Wire.endTransmission(); // stop transmitting |
| |
| // Connect to device and set register address |
| Wire.beginTransmission(address); |
| Wire.write(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.read(); |
| Wire.endTransmission(); // stop transmitting |
| |
| |
| // Connect to device and set register address |
| Wire.beginTransmission(address); |
| Wire.write(byte(0x00)); // sends address (command register) |
| Wire.endTransmission(); // stop transmitting |
| // get sensor setting |
| Wire.beginTransmission(address); |
| Wire.requestFrom(address, 1); |
| setting = Wire.read(); |
| 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); |
| } |
| |