Rev 2194 Rev 2240
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1 // I2C Light Sensor 1 // I2C Light Sensor
2   2  
3 #include <Wire.h> 3 #include <Wire.h>
-   4 #include <math.h>
4   5  
5 #define address 0x44 // A0 = L 6 #define address 0x44 // A0 = L
-   7 #define SENSE_VIS 0
-   8 #define SENSE_IR 1
-   9  
-   10 #define LIGHT_AUTORANGE 0
-   11 #define LIGHT_RANGE1 1
-   12 #define LIGHT_RANGE2 2
-   13 #define LIGHT_RANGE3 3
-   14 #define LIGHT_RANGE4 4
-   15  
6   16  
7 void setup() 17 void setup()
8 { 18 {
9 Wire.begin(); // join i2c bus (address optional for master) 19 Wire.begin(); // join i2c bus (address optional for master)
-   20 // I2C pins PD4, PD5
-   21 //
10 pinMode(3, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela 22 pinMode(3, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela
11 pinMode(5, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela 23 pinMode(5, OUTPUT); // LED pro blikani, aby bylo videt, ze to neco dela
12 Serial.begin(9600); // Zmerena intenzita osvetleni se bude vypisovat na seriovou linku 24 Serial.begin(9600); // Zmerena intenzita osvetleni se bude vypisovat na seriovou linku
13 } 25 }
14   26  
15 int data = 0; 27 int data = 0;
-   28 int light_sensor_setup;
16   29  
17 void loop() 30 void led_blink()
18 { 31 {
-   32 digitalWrite(3, HIGH); // set the LED on
19 int lux=0; 33 delay(500);
20   -  
-   34 digitalWrite(3, LOW); // set the LED off
21 Serial.print("lux="); 35 delay(500);
22   36 }
23 // Setup device -  
24 digitalWrite(5, HIGH); -  
25   37  
26 Wire.beginTransmission(address); -  
27 Wire.send(0x00); // sends address -  
28 Wire.send(0b11000000); // setup (eye light sensing; one time measurement; measurement range 1) -  
29 Wire.endTransmission(); // stop transmitting -  
30   38  
31 // Delay for measurement 39 int set_light_sensor(int mode)
-   40 {
-   41 int command;
-   42
-   43 switch (mode)
32 { 44 {
33 long n; 45 case SENSE_VIS:
34 for(n=0;n<66000;n++) -  
35 { 46 {
36 digitalWrite(5, LOW); // set the LED off 47 command=0b11000000; // setup (eye light sensing; one time measurement; measurement range 1)
37 // delay(500); -  
38 digitalWrite(5, HIGH); // set the LED on -  
39 delayMicroseconds(100); -  
40 // delay(500); 48 break;
41 } 49 }
42 } -  
43   50  
-   51 case SENSE_IR:
-   52 {
-   53 command=0b11100000; // setup (eye light sensing; measurement range 2 [4000 lx])
-   54 break;
-   55 }
-   56
-   57 default:
-   58 return 3;
-   59 }
44   60  
45 // Connect to device and set register address 61 // Setup device
46 Wire.beginTransmission(address); 62 Wire.beginTransmission(address);
47 Wire.send(0x00); // sends address 63 Wire.write(0x00); // sends address
48 Wire.endTransmission(); // stop transmitting 64 Wire.write(command); // setup (eye light sensing; one time measurement; measurement range 1)
49 // Connect to device and request one byte -  
50 Wire.beginTransmission(address); -  
51 Wire.requestFrom(address, 1); -  
52 data = Wire.receive(); -  
53 Wire.endTransmission(); // stop transmitting 65 Wire.endTransmission(); // stop transmitting
54 // Serial.print(data, HEX); -  
55   66
56 // Serial.print(" LSB="); 67
57 // Connect to device and set register address 68 // Connect to device and set register address
58 Wire.beginTransmission(address); 69 Wire.beginTransmission(address);
59 Wire.send(0x01); // sends address 70 Wire.write(0x00); // sends address (command register)
60 Wire.endTransmission(); // stop transmitting 71 Wire.endTransmission(); // stop transmitting
-   72
61 // Connect to device and request one byte 73 // verify written command byte
62 Wire.beginTransmission(address); 74 Wire.beginTransmission(address);
63 Wire.requestFrom(address, 1); 75 Wire.requestFrom(address, 1);
64 data = Wire.receive(); 76 if (command != Wire.read())
-   77 {
-   78 return 4;
-   79 Serial.print(data, BIN);
-   80 }
65 Wire.endTransmission(); // stop transmitting 81 Wire.endTransmission(); // stop transmitting
66 // Serial.print(data, HEX); 82 light_sensor_setup=command;
67 lux=data; 83 }
68   84  
69 // Serial.print(" MSB="); -  
70 // Connect to device and set register address -  
71 Wire.beginTransmission(address); -  
72 Wire.send(0x02); // sends address -  
73 Wire.endTransmission(); // stop transmitting -  
74 // Connect to device and request one byte -  
75 Wire.beginTransmission(address); -  
76 Wire.requestFrom(address, 1); -  
77 data = Wire.receive(); 85 float get_light_measurement()
78 Wire.endTransmission(); // stop transmitting -  
79 // Serial.print(data, HEX); -  
-   86 {
80 lux+=data*256; 87 int ret=0;
81   88  
82 /* -  
83 Serial.print((unsigned)lux, DEC); -  
84 -  
85 Serial.print(" luxIR="); -  
86 -  
87 // Setup device -  
88 Wire.beginTransmission(address); -  
89 Wire.send(0x00); // sends address -  
90 Wire.send(0b11100000); // setup (eye light sensing; measurement range 2 [4000 lx]) -  
91 Wire.endTransmission(); // stop transmitting -  
92 -  
93 // Delay for measurement -  
94 digitalWrite(3, HIGH); // set the LED on -  
95 delay(500); -  
96 digitalWrite(3, LOW); // set the LED off -  
97 delay(500); -  
98 -  
99 -  
100 // Connect to device and set register address 89 // Connect to device and set register address
101 Wire.beginTransmission(address); 90 Wire.beginTransmission(address);
102 Wire.send(0x00); // sends address 91 Wire.write(0x01); // sends address of LSB reagister
103 Wire.endTransmission(); // stop transmitting 92 Wire.endTransmission(); // stop transmitting
104 // Connect to device and request one byte -  
105 Wire.beginTransmission(address); -  
106 Wire.requestFrom(address, 1); -  
107 data = Wire.receive(); -  
108 Wire.endTransmission(); // stop transmitting -  
109 // Serial.print(data, HEX); -  
110 93
111 // Serial.print(" LSB="); -  
112 // Connect to device and set register address -  
113 Wire.beginTransmission(address); -  
114 Wire.send(0x01); // sends address -  
115 Wire.endTransmission(); // stop transmitting -  
116 // Connect to device and request one byte 94 // Connect to device and request one byte
117 Wire.beginTransmission(address); 95 Wire.beginTransmission(address);
118 Wire.requestFrom(address, 1); 96 Wire.requestFrom(address, 1);
119 data = Wire.receive(); 97 ret = Wire.read();
120 Wire.endTransmission(); // stop transmitting 98 Wire.endTransmission(); // stop transmitting
121 // Serial.print(data, HEX); -  
122 lux=data; -  
123 99
124 // Serial.print(" MSB="); -  
125 // Connect to device and set register address 100 // Connect to device and set register address
126 Wire.beginTransmission(address); 101 Wire.beginTransmission(address);
127 Wire.send(0x02); // sends address 102 Wire.write(0x02); // sends address of MSB register
128 Wire.endTransmission(); // stop transmitting 103 Wire.endTransmission(); // stop transmitting
-   104
129 // Connect to device and request one byte 105 // Connect to device and request one byte
130 Wire.beginTransmission(address); 106 Wire.beginTransmission(address);
131 Wire.requestFrom(address, 1); 107 Wire.requestFrom(address, 1);
132 data = Wire.receive(); 108 ret +=256 * Wire.read();
133 Wire.endTransmission(); // stop transmitting 109 Wire.endTransmission(); // stop transmitting
-   110  
134 // Serial.print(data, HEX); 111 return (1000.0/pow(2.0,16)*ret);
-   112 }
-   113  
-   114 void loop()
-   115 {
135 lux+=data*256; 116 int lux=0;
136 */ 117  
-   118 set_light_sensor(SENSE_VIS); //setup sensor for visible measuring
-   119 led_blink(); // Delay for measurement
-   120 Serial.print("lux=");
137 Serial.println((unsigned)lux, DEC); 121 Serial.println(get_light_measurement(),2);
-   122  
-   123 set_light_sensor(SENSE_IR); // setup sensor for infrared measuring
-   124 led_blink(); // Delay for measurement
-   125 Serial.print("luxIR=");
-   126 Serial.println(get_light_measurement(), 2); // data print
138 } 127 }
139   128