Arduino I2C + 数字式环境光传感器BH1750FVI

 1 /*
 2 Measurement of illuminance using the BH1750FVI sensor module
 3 Connection:
 4 Module        UNO
 5 VCC    <----->    5V
 6 GND    <----->    GND
 7 SCL    <----->    A5
 8 SDA    <----->    A4
 9 ADD    <----->    NC
10 
11 */
12 #include <Wire.h>
13 
14 #define ADDRESS_BH1750FVI 0x23    //ADDR="L" for this module
15 #define ONE_TIME_H_RESOLUTION_MODE 0x20
16 //One Time H-Resolution Mode:
17 //Resolution = 1 lux
18 //Measurement time (max.) = 180ms
19 //Power down after each measurement
20 
21 byte highByte = 0;
22 byte lowByte = 0;
23 unsigned int sensorOut = 0;
24 unsigned int illuminance = 0;
25 
26 
27 void setup()
28 {
29     Wire.begin();
30     Serial.begin(115200);
31 }
32 
33 void loop()
34 {
35     Wire.beginTransmission(ADDRESS_BH1750FVI); //"notify" the matching device
36     Wire.write(ONE_TIME_H_RESOLUTION_MODE);     //set operation mode
37     Wire.endTransmission();
38         
39     delay(180);
40 
41     Wire.requestFrom(ADDRESS_BH1750FVI, 2); //ask Arduino to read back 2 bytes from the sensor
42     highByte = Wire.read();  // get the high byte
43     lowByte = Wire.read(); // get the low byte
44     
45     sensorOut = (highByte<<8)|lowByte;
46     illuminance = sensorOut/1.2;
47     Serial.print(illuminance);    Serial.println(" lux");
48 
49     delay(1000);
50 }