Features:

1. No ambient light distinction
2. High precision determination accurate to 1 Lu for different lights
3. ROHM original package BH1750FVI chip

Broad Schematic:

1. J1 is interfacing connector
2. U1 is voltage regulator which gives out 3V to board from 3.3-5V supply input
3. Q1 is bidirectional data level translator for 5V to 3V level conversion
4. D1 is unidirectional clock level translator for 5V to 3V level conversion
5. Please note that the "addr" Pin is to assign a different I2C address to the sensor.

Wire Configuration:

1.  VCC-5v
2.  GND-GND
3.  SCL-SCL(analog pin 5)
4.  SDA-SDA(analog pin 4)
5.  ADD-NC

Arduino Sample Code:

#include <Wire.h> //BH1750 IIC Mode 

#include <math.h> 

int BH1750address = 0x23; //setting i2c address

byte buff[2];

void setup()

{

  Wire.begin();

  Serial.begin(57600);//init Serial rate

}

void loop()

{

  int i;

  uint16_t val=0;

  BH1750_Init(BH1750address);

  delay(200);

  if(2==BH1750_Read(BH1750address))

  {

    val=((buff[0]<<8)|buff[1])/1.2;

    Serial.print(val,DEC);     

    Serial.println("[lx]"); 

  }

  delay(150);

}

int BH1750_Read(int address) //

{

  int i=0;

  Wire.beginTransmission(address);

  Wire.requestFrom(address, 2);

  while(Wire.available()) //

  {

    buff[i] = Wire.receive();  // receive one byte

    i++;

  }

  Wire.endTransmission();  

  return i;

}

void BH1750_Init(int address) 

{

  Wire.beginTransmission(address);

  Wire.send(0x10);//1lx reolution 120ms

  Wire.endTransmission();

}

Package Includes:

1 x BH1750FVI Digital Light intensity Sensor