#include <Wire.h> //IIC库
#include <math.h>
int BH1750address = 0x23;//芯片地址为16位23
byte buff[2];
void setup()
{
Wire.begin();
Serial.begin(9600);
pinMode(13,OUTPUT);
}
void loop()
{
int i;
uint16_t val=0;
BH1750_Init(BH1750address);
delay(1000);
if(2==BH1750_Read(BH1750address))
{
val=((buff[0]<<8)|buff[1])/1.2;
Serial.print(val,DEC);
Serial.println("[lx]");
if(val<900||val>1200)
{
digitalWrite(13,HIGH);
}
else
{
digitalWrite(13,LOW);
}
}
delay(150);
}
int BH1750_Read(int address) //
{
int i=0;
Wire.beginTransmission(address);
Wire.requestFrom(address, 2);
while(Wire.available()) //
{
buff[i] = Wire.read(); // read one byte
i++;
}
Wire.endTransmission();
return i;
}
void BH1750_Init(int address)
{
Wire.beginTransmission(address);
Wire.write(0x10);//1lx reolution 120ms
Wire.endTransmission();
}
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