Rev 2440 Rev 2441
1 // I2C Light Sensor 1 // I2C Light Sensor
2   2  
3 #include <Wire.h> 3 #include <Wire.h>
4 #include <math.h> 4 #include <math.h>
5   5  
6 #define address 0x44 // A0 = L 6 #define address 0x44 // A0 = L
7 #define SENSE_VIS 0 7 #define SENSE_VIS 0
8 #define SENSE_IR 1 8 #define SENSE_IR 1
9   9  
10 #define LIGHT_AUTORANGE 0 10 #define LIGHT_AUTORANGE 0
11 #define LIGHT_RANGE1 1 11 #define LIGHT_RANGE1 1
12 #define LIGHT_RANGE2 2 12 #define LIGHT_RANGE2 2
13 #define LIGHT_RANGE3 3 13 #define LIGHT_RANGE3 3
14 #define LIGHT_RANGE4 4 14 #define LIGHT_RANGE4 4
15   15  
16   16  
17 void setup() 17 void setup()
18 { 18 {
19 Wire.begin(); // join i2c bus (address optional for master) 19 Wire.begin(); // join i2c bus (address optional for master)
20 // I2C pins PC4 - , PC5 - 20 // I2C pins PC4 - SDA , PC5 - SCL
21 // 21 //
22 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
23 Serial.begin(9600); // Zmerena intenzita osvetleni se bude vypisovat na seriovou linku 23 Serial.begin(9600); // Zmerena intenzita osvetleni se bude vypisovat na seriovou linku
24 Serial.println("LABduino luxmeter demo - (c) MLAB, kakl 2012"); 24 Serial.println("LABduino luxmeter demo - (c) MLAB.cz, kakl 2012");
25 } 25 }
26   26  
27 int data = 0; 27 int data = 0;
28 int light_sensor_setup; 28 int light_sensor_setup;
29   29  
30 void led_blink() 30 void led_blink()
31 { 31 {
32 digitalWrite(3, HIGH); // set the LED off 32 digitalWrite(3, HIGH); // set the LED on
33 delay(100); 33 delay(100);
34 digitalWrite(3, LOW); // set the LED on 34 digitalWrite(3, LOW); // set the LED off
35 delay(700); 35 delay(700);
36 } 36 }
37   37  
38   38  
39 int set_light_sensor(int mode) 39 int set_light_sensor(int mode)
40 { 40 {
41 int command; 41 int command;
42 42
43 switch (mode) 43 switch (mode)
44 { 44 {
45 case SENSE_VIS: 45 case SENSE_VIS:
46 { 46 {
47 command=0b11000001; // setup (eye light sensing; measurement range 2) 47 command=0b11000001; // setup (eye light sensing; measurement range 2)
48 break; 48 break;
49 } 49 }
50   50  
51 case SENSE_IR: 51 case SENSE_IR:
52 { 52 {
53 command=0b11100001; // setup (eye light sensing; measurement range 2 [4000 lx]) 53 command=0b11100001; // setup (eye light sensing; measurement range 2 [4000 lx])
54 break; 54 break;
55 } 55 }
56 56
57 default: 57 default:
58 return 3; 58 return 3;
59 } 59 }
60   60  
61 // Setup device 61 // Setup device
62 Wire.beginTransmission(address); 62 Wire.beginTransmission(address);
63 Wire.write(byte(0x00)); // sends address 63 Wire.write(byte(0x00)); // sends address
64 Wire.write(byte(command)); // setup (eye light sensing; one time measurement; measurement range 1) 64 Wire.write(byte(command)); // setup (eye light sensing; one time measurement; measurement range 1)
65 Wire.endTransmission(); // stop transmitting 65 Wire.endTransmission(); // stop transmitting
66 66
67 67
68 // Connect to device and set register address 68 // Connect to device and set register address
69 Wire.beginTransmission(address); 69 Wire.beginTransmission(address);
70 Wire.write(byte(0x00)); // sends address (command register) 70 Wire.write(byte(0x00)); // sends address (command register)
71 Wire.endTransmission(); // stop transmitting 71 Wire.endTransmission(); // stop transmitting
72 72
73 // verify written command byte 73 // verify written command byte
74 Wire.beginTransmission(address); 74 Wire.beginTransmission(address);
75 Wire.requestFrom(address, 1); 75 Wire.requestFrom(address, 1);
76 if (command != Wire.read()) 76 if (command != Wire.read())
77 { 77 {
78 return 4; 78 return 4;
79 Serial.print(data, BIN); 79 Serial.print(data, BIN);
80 } 80 }
81 Wire.endTransmission(); // stop transmitting 81 Wire.endTransmission(); // stop transmitting
82 light_sensor_setup=command; 82 light_sensor_setup=command;
83 } 83 }
84   84  
85 float get_light_measurement() 85 float get_light_measurement()
86 { 86 {
87 unsigned int ret=0; 87 unsigned int ret=0;
88   88  
89 // Connect to device and set register address 89 // Connect to device and set register address
90 Wire.beginTransmission(address); 90 Wire.beginTransmission(address);
91 Wire.write(byte(0x01)); // sends address of LSB reagister 91 Wire.write(byte(0x01)); // sends address of LSB reagister
92 Wire.endTransmission(); // stop transmitting 92 Wire.endTransmission(); // stop transmitting
93 93
94 // Connect to device and request one byte 94 // Connect to device and request one byte
95 Wire.beginTransmission(address); 95 Wire.beginTransmission(address);
96 Wire.requestFrom(address, 1); 96 Wire.requestFrom(address, 1);
97 ret = Wire.read(); 97 ret = Wire.read();
98 Wire.endTransmission(); // stop transmitting 98 Wire.endTransmission(); // stop transmitting
99 99
100 // Connect to device and set register address 100 // Connect to device and set register address
101 Wire.beginTransmission(address); 101 Wire.beginTransmission(address);
102 Wire.write(byte(0x02)); // sends address of MSB register 102 Wire.write(byte(0x02)); // sends address of MSB register
103 Wire.endTransmission(); // stop transmitting 103 Wire.endTransmission(); // stop transmitting
104 104
105 // Connect to device and request one byte 105 // Connect to device and request one byte
106 Wire.beginTransmission(address); 106 Wire.beginTransmission(address);
107 Wire.requestFrom(address, 1); 107 Wire.requestFrom(address, 1);
108 ret +=256 * Wire.read(); 108 ret +=256 * Wire.read();
109 Wire.endTransmission(); // stop transmitting 109 Wire.endTransmission(); // stop transmitting
110   110  
111 return (4000.0/pow(2.0,16)*ret); 111 return (4000.0/pow(2.0,16)*ret);
112 } 112 }
113   113  
114 void loop() 114 void loop()
115 { 115 {
116 int lux=0; 116 int lux=0;
117   117  
118 set_light_sensor(SENSE_VIS); //setup sensor for visible measuring 118 set_light_sensor(SENSE_VIS); //setup sensor for visible measuring
119 led_blink(); // Delay for measurement 119 led_blink(); // Delay for measurement
120 Serial.print("luxVIS\t"); 120 Serial.print("luxVIS\t");
121 Serial.print(get_light_measurement(),1); 121 Serial.print(get_light_measurement(),1);
122 Serial.print("\t"); 122 Serial.print("\t");
123   123  
124 set_light_sensor(SENSE_IR); // setup sensor for infrared measuring 124 set_light_sensor(SENSE_IR); // setup sensor for infrared measuring
125 led_blink(); // Delay for measurement 125 led_blink(); // Delay for measurement
126 Serial.print("luxIR\t"); 126 Serial.print("luxIR\t");
127 Serial.println(get_light_measurement(),1); // data print 127 Serial.println(get_light_measurement(),1); // data print
128 } 128 }
129   129