Rev 2250 Rev 2258
1 /* I2C Light Sensor 1 /* I2C Light Sensor
2   2  
3 The circuit: 3 The circuit:
4 * analog sensors on analog ins PC0, PC1, and PC2 4 * analog sensors on analog ins PC0, PC1, and PC2
5 * SD card attached to SPI bus as follows: 5 * SD card attached to SPI bus as follows:
6 ** MOSI/CMD - PB3 6 ** MOSI/CMD - PB3
7 ** MISO/DAT0 - PB4 7 ** MISO/DAT0 - PB4
8 ** CLK - PB5 8 ** CLK - PB5
9 ** CS/CD/DAT3 - PD4 (4) 9 ** CS/CD/DAT3 - PD4 (4)
10   10  
11 I2C pins PC4, PC5 11 I2C pins PC4, PC5
12 12
13 */ 13 */
14   14  
15 #include <Wire.h> 15 #include <Wire.h>
16 #include <math.h> 16 #include <math.h>
17 #include <stdlib.h> 17 #include <stdlib.h>
18 #include <SD.h> 18 #include <SD.h>
19   19  
20 #define chipSelect 4 20 #define chipSelect 4
21   21  
22 #define address 0x44 // A0 = L 22 #define address 0x44 // A0 = L
23   23  
24 #define LIGHT_ENABLE 1 24 #define LIGHT_ENABLE 1
25 #define LIGHT_DISABLE 0 25 #define LIGHT_DISABLE 0
26   26  
27 #define LIGHT_ONETIME 0 27 #define LIGHT_ONETIME 0
28 #define LIGHT_CONTINUOUS 1 28 #define LIGHT_CONTINUOUS 1
29   29  
30 #define LIGHT_SENSE_VIS 0 30 #define LIGHT_SENSE_VIS 0
31 #define LIGHT_SENSE_IR 1 31 #define LIGHT_SENSE_IR 1
32   32  
33 #define LIGHT_INTERNAL_16 0b00000000 33 #define LIGHT_INTERNAL_16 0b00000000
34 #define LIGHT_INTERNAL_12 0b00000100 34 #define LIGHT_INTERNAL_12 0b00000100
35 #define LIGHT_INTERNAL_8 0b00001000 35 #define LIGHT_INTERNAL_8 0b00001000
36 #define LIGHT_INTERNAL_4 0b00001100 36 #define LIGHT_INTERNAL_4 0b00001100
37 #define LIGHT_EXTERNAL_ADC 0b00010000 37 #define LIGHT_EXTERNAL_ADC 0b00010000
38 #define LIGHT_EXTERNAL_TIMER 0b00010100 38 #define LIGHT_EXTERNAL_TIMER 0b00010100
39   39  
40 //#define LIGHT_AUTORANGE 0 40 //#define LIGHT_AUTORANGE 0
41   41  
42 #define LIGHT_RANGE1 0b00000000 42 #define LIGHT_RANGE1 0b00000000
43 #define LIGHT_RANGE2 0b00000001 43 #define LIGHT_RANGE2 0b00000001
44 #define LIGHT_RANGE3 0b00000010 44 #define LIGHT_RANGE3 0b00000010
45 #define LIGHT_RANGE4 0b00000011 45 #define LIGHT_RANGE4 0b00000011
46   46  
47 char filename[13]; 47 char filename[13];
48   48  
49 void setup() 49 void setup()
50 { 50 {
51 int count=0; 51 int count=0;
52   52  
53 Wire.begin(); // join i2c bus (address optional for master) 53 Wire.begin(); // join i2c bus (address optional for master)
54   54  
55 pinMode(3, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela 55 pinMode(3, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela
56 pinMode(5, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela 56 pinMode(5, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela
57 Serial.begin(9600); // Zmerena intenzita osvetleni se bude vypisovat na seriovou linku 57 Serial.begin(9600); // Zmerena intenzita osvetleni se bude vypisovat na seriovou linku
58 58
59 Serial.print("Initializing SD card..."); 59 Serial.print("Initializing SD card...");
60 // make sure that the default chip select pin is set to 60 // make sure that the default chip select pin is set to
61 // output, even if you don't use it: 61 // output, even if you don't use it:
62 pinMode(10, OUTPUT); 62 pinMode(10, OUTPUT);
63 63
64 // see if the card is present and can be initialized: 64 // see if the card is present and can be initialized:
65 if (!SD.begin(chipSelect)) { 65 if (!SD.begin(chipSelect)) {
66 Serial.println("Card failed, or not present"); 66 Serial.println("Card failed, or not present");
67 // don't do anything more: 67 // don't do anything more:
68 return; 68 return;
69 } 69 }
70 Serial.println("card initialized."); 70 Serial.println("card initialized.");
71 Serial.print("searching for files..."); 71 Serial.print("searching for files...");
72 72
73 do 73 do
74 { 74 {
75 sprintf(filename,"Lux%d.txt",count); 75 sprintf(filename,"Lux%d.txt",count);
76 count++; 76 count++;
77 } 77 }
78 while(SD.exists(filename)); 78 while(SD.exists(filename));
79 Serial.print("Using "); 79 Serial.print("Using ");
80 Serial.println(filename); 80 Serial.println(filename);
81 } 81 }
82   82  
83 void led_blink() 83 void led_blink()
84 { 84 {
85 digitalWrite(3, HIGH); // set the LED on -  
86 delay(100); -  
87 digitalWrite(3, LOW); // set the LED off 85 digitalWrite(3, LOW); // set the LED off
-   86 delay(100);
-   87 digitalWrite(3, HIGH); // set the LED on
88 } 88 }
89   89  
90 /*int light_sensor_write( unsigned int data, unsigned int address) 90 /*int light_sensor_write( unsigned int data, unsigned int address)
91 { 91 {
92 } 92 }
93 */ 93 */
94   94  
95   95  
96 int set_light_sensor(int en, int mode, int light, int res, int range) 96 int set_light_sensor(int en, int mode, int light, int res, int range)
97 { 97 {
98 int command=0; 98 int command=0;
99   99  
100 command = (command & 0b01111111) | (en << 7); 100 command = (command & 0b01111111) | (en << 7);
101 command = (command & 0b10111111) | (mode << 6); 101 command = (command & 0b10111111) | (mode << 6);
102 command = (command & 0b11011111) | (light << 5); 102 command = (command & 0b11011111) | (light << 5);
103 command = (command & 0b11100011) | (res << 2); 103 command = (command & 0b11100011) | (res << 2);
104 command = (command & 0b11111100) | (range); 104 command = (command & 0b11111100) | (range);
105   105  
106 // Setup device 106 // Setup device
107 Wire.beginTransmission(address); 107 Wire.beginTransmission(address);
108 Wire.send(0x00); // sends address 108 Wire.send(0x00); // sends address
109 Wire.send(command); // setup (eye light sensing; one time measurement; measurement range 1) 109 Wire.send(command); // setup (eye light sensing; one time measurement; measurement range 1)
110 Wire.endTransmission(); // stop transmitting 110 Wire.endTransmission(); // stop transmitting
111 111
112 // Connect to device and set register address 112 // Connect to device and set register address
113 Wire.beginTransmission(address); 113 Wire.beginTransmission(address);
114 Wire.send(0x00); // sends address (command register) 114 Wire.send(0x00); // sends address (command register)
115 Wire.endTransmission(); // stop transmitting 115 Wire.endTransmission(); // stop transmitting
116 // verify written command byte 116 // verify written command byte
117 Wire.beginTransmission(address); 117 Wire.beginTransmission(address);
118 Wire.requestFrom(address, 1); 118 Wire.requestFrom(address, 1);
119 if (command != Wire.receive()) 119 if (command != Wire.receive())
120 { 120 {
121 Serial.println("Error in sensor setting"); 121 Serial.println("Error in sensor setting");
122 return 4; 122 return 4;
123 } 123 }
124 Wire.endTransmission(); // stop transmitting 124 Wire.endTransmission(); // stop transmitting
125 return 0; 125 return 0;
126 } 126 }
127   127  
128 float get_light_measurement() 128 float get_light_measurement()
129 { 129 {
130 unsigned int ret=0; 130 unsigned int ret=0;
131 unsigned int setting=0; // variable to storage readed settings 131 unsigned int setting=0; // variable to storage readed settings
132   132  
133 unsigned long int resolution; // parsed ADC bit resolution 133 unsigned long int resolution; // parsed ADC bit resolution
134 unsigned int range; // parsed measurement range 134 unsigned int range; // parsed measurement range
135   135  
136 // Connect to device and set register address 136 // Connect to device and set register address
137 Wire.beginTransmission(address); 137 Wire.beginTransmission(address);
138 Wire.send(0x01); // sends address of LSB reagister 138 Wire.send(0x01); // sends address of LSB reagister
139 Wire.endTransmission(); // stop transmitting 139 Wire.endTransmission(); // stop transmitting
140 140
141 // Connect to device and request first byte 141 // Connect to device and request first byte
142 Wire.beginTransmission(address); 142 Wire.beginTransmission(address);
143 Wire.requestFrom(address, 1); 143 Wire.requestFrom(address, 1);
144 ret = Wire.receive(); 144 ret = Wire.receive();
145 Wire.endTransmission(); // stop transmitting 145 Wire.endTransmission(); // stop transmitting
146 146
147 // Connect to device and set register address 147 // Connect to device and set register address
148 Wire.beginTransmission(address); 148 Wire.beginTransmission(address);
149 Wire.send(0x02); // sends address of MSB register 149 Wire.send(0x02); // sends address of MSB register
150 Wire.endTransmission(); // stop transmitting 150 Wire.endTransmission(); // stop transmitting
151 151
152 // Connect to device and request second byte 152 // Connect to device and request second byte
153 Wire.beginTransmission(address); 153 Wire.beginTransmission(address);
154 Wire.requestFrom(address, 1); 154 Wire.requestFrom(address, 1);
155 ret +=256 * Wire.receive(); 155 ret +=256 * Wire.receive();
156 Wire.endTransmission(); // stop transmitting 156 Wire.endTransmission(); // stop transmitting
157   157  
158   158  
159 // Connect to device and set register address 159 // Connect to device and set register address
160 Wire.beginTransmission(address); 160 Wire.beginTransmission(address);
161 Wire.send(0x00); // sends address (command register) 161 Wire.send(0x00); // sends address (command register)
162 Wire.endTransmission(); // stop transmitting 162 Wire.endTransmission(); // stop transmitting
163 // get sensor setting 163 // get sensor setting
164 Wire.beginTransmission(address); 164 Wire.beginTransmission(address);
165 Wire.requestFrom(address, 1); 165 Wire.requestFrom(address, 1);
166 setting = Wire.receive(); 166 setting = Wire.receive();
167 Wire.endTransmission(); // stop transmitting 167 Wire.endTransmission(); // stop transmitting
168 168
169 switch (setting & 0b00011100) // determine ADC resolution 169 switch (setting & 0b00011100) // determine ADC resolution
170 { 170 {
171 case LIGHT_INTERNAL_16: 171 case LIGHT_INTERNAL_16:
172 resolution=65536; 172 resolution=65536;
173 break; 173 break;
174 174
175 case LIGHT_INTERNAL_12: 175 case LIGHT_INTERNAL_12:
176 resolution=4096; 176 resolution=4096;
177 break; 177 break;
178 178
179 case LIGHT_INTERNAL_8: 179 case LIGHT_INTERNAL_8:
180 resolution=256; 180 resolution=256;
181 break; 181 break;
182 182
183 case LIGHT_INTERNAL_4: 183 case LIGHT_INTERNAL_4:
184 resolution=16; 184 resolution=16;
185 break; 185 break;
186 } 186 }
187 187
188 switch (setting & 0b00000011) // determine measurement range 188 switch (setting & 0b00000011) // determine measurement range
189 { 189 {
190 case LIGHT_RANGE1: 190 case LIGHT_RANGE1:
191 range=1000; 191 range=1000;
192 break; 192 break;
193 193
194 case LIGHT_RANGE2: 194 case LIGHT_RANGE2:
195 range=4000; 195 range=4000;
196 break; 196 break;
197 197
198 case LIGHT_RANGE3: 198 case LIGHT_RANGE3:
199 range=16000; 199 range=16000;
200 break; 200 break;
201 201
202 case LIGHT_RANGE4: 202 case LIGHT_RANGE4:
203 range=64000; 203 range=64000;
204 break; 204 break;
205 } 205 }
206 return ((500000.0*range)/(180000.0*resolution)*ret); // calculate output value 206 return ((500000.0*range)/(180000.0*resolution)*ret); // calculate output value
207 } 207 }
208   208  
209 void loop() 209 void loop()
210 { 210 {
211 float luxVIS=0; 211 float luxVIS=0;
212 float luxIR=0; 212 float luxIR=0;
213 float time; 213 float time;
214   214  
215 set_light_sensor(LIGHT_ENABLE, LIGHT_ONETIME, LIGHT_SENSE_VIS, LIGHT_INTERNAL_16, LIGHT_RANGE3); //setup sensor for visible measuring 215 set_light_sensor(LIGHT_ENABLE, LIGHT_ONETIME, LIGHT_SENSE_VIS, LIGHT_INTERNAL_16, LIGHT_RANGE3); //setup sensor for visible measuring
216 led_blink(); // Delay for measurement 216 led_blink(); // Delay for measurement
217 delay(500); 217 delay(500);
218 luxVIS=get_light_measurement(); 218 luxVIS=get_light_measurement();
219   219  
220 time=millis()/1000.0; 220 time=millis()/1000.0;
221 221
222 set_light_sensor(LIGHT_ENABLE, LIGHT_ONETIME, LIGHT_SENSE_IR, LIGHT_INTERNAL_16, LIGHT_RANGE3); // setup sensor for infrared measuring 222 set_light_sensor(LIGHT_ENABLE, LIGHT_ONETIME, LIGHT_SENSE_IR, LIGHT_INTERNAL_16, LIGHT_RANGE3); // setup sensor for infrared measuring
223 led_blink(); // Delay for measurement 223 led_blink(); // Delay for measurement
224 delay(500); 224 delay(500);
225 luxIR=get_light_measurement(); 225 luxIR=get_light_measurement();
226 226
227 // open the file. note that only one file can be open at a time, 227 // open the file. note that only one file can be open at a time,
228 // so you have to close this one before opening another. 228 // so you have to close this one before opening another.
229 File dataFile = SD.open(filename, FILE_WRITE); 229 File dataFile = SD.open(filename, FILE_WRITE);
230   230  
231 // if the file is available, write to it: 231 // if the file is available, write to it:
232 if (dataFile) { 232 if (dataFile) {
233 dataFile.print("$LUX0.1 "); 233 dataFile.print("$LUX0.1 ");
234 dataFile.print(time,3); 234 dataFile.print(time,3);
235 dataFile.print(" "); 235 dataFile.print(" ");
236 dataFile.print(luxVIS,3); 236 dataFile.print(luxVIS,3);
237 dataFile.print(" "); 237 dataFile.print(" ");
238 dataFile.println(luxIR,3); 238 dataFile.println(luxIR,3);
239 dataFile.close(); 239 dataFile.close();
240 240
241 // print to the serial port too: 241 // print to the serial port too:
242 Serial.print("$LUX0.1 "); 242 Serial.print("$LUX0.1 ");
243 Serial.print(time,3); 243 Serial.print(time,3);
244 Serial.print(" "); 244 Serial.print(" ");
245 Serial.print(luxVIS,3); 245 Serial.print(luxVIS,3);
246 Serial.print(" "); 246 Serial.print(" ");
247 Serial.println(luxIR,3); 247 Serial.println(luxIR,3);
248 } 248 }
249 // if the file isn't open, pop up an error: 249 // if the file isn't open, pop up an error:
250 else { 250 else {
251 Serial.print("error opening "); 251 Serial.print("error opening ");
252 Serial.println(filename); 252 Serial.println(filename);
253 } 253 }
254 delay(2000); 254 delay(2000);
255 } 255 }
256   256