光照模块GY30和arduino通讯

连4根线，VCC、GND、SCL、SDA,SCL、SDA连接arduino的A5、A4脚：

代码：

#include <Wire.h>

// GY-30
// BH1750FVI
// in ADDR 'L' mode 7bit addr
#define ADDR 0b0100011
// addr 'H' mode
// #define ADDR 0b1011100

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Wire.begin();
pinMode(13, OUTPUT);

Wire.beginTransmission(ADDR);
Wire.write(0b00000001);
Wire.endTransmission();

}

void loop() {
// put your main code here, to run repeatedly:
int val = 0;

// reset
Wire.beginTransmission(ADDR);
Wire.write(0b00000111);
Wire.endTransmission();

digitalWrite(13, LOW);
delay(100);

Wire.beginTransmission(ADDR);
Wire.write(0b00100000);
Wire.endTransmission();

// typical read delay 120ms
delay(120);

Wire.requestFrom(ADDR, 2); // 2byte every time

for (val=0; Wire.available()>=1; ) {
char c = Wire.read();
//Serial.println(c, HEX);
val = (val << 8) + (c & 0xFF);
}

val = val / 1.2;
Serial.print("lx: ");
Serial.println(val);

// Serial.println("OK");
digitalWrite(13, HIGH);
delay(500);

}