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SENZ011 is a environment light intensity sensor breakout board which has a BH1750 chip. A 16 bit AD converter is built-in so that SENZ011 can directly output a digital result in lx(Lux) and doesn't need complicated calculations. This is a more accurate and easier. When objects which are lighted in homogeneous get the 1 luminous flux in one square meter, its illumination intensity is 1lx. Sometimes to take good advantage of the illuminant, you can add a reflector to the illuminant. So that there will be more luminous flux in some directions and it can increase the ilumination of the target surface.

Usage : detect the illumination intensity and its variation.

• Power supply: +3 ~ 5V

• Interface : I2C

• Measuring range: 1 - 65535 lx

• 2 types of I2C slave-address can be selected

• Small measurement variation (+/- 20%)

• Size: 33 x 15 mm

• Illumination intensity example:

  • Nignt : 0.001 - 0.02;
  • moonlightnight : 0.02 - 0.3;
  • cloudy indoor : 5 - 50;
  • cloudy outdoor : 50 - 500;
  • Sunny indoor : 100 - 1000;
  • under the sunlight in summer afternoon : 0.6e5 - 1e5;
  • reading books:50 - 60;
  • home video : 1400

/*
 Sample code for the SENZ011 Light sensor
 Version 0.1

 Connection:

 VCC-5v
 GND-GND
 SCL-SCL(analog pin 5)
 SDA-SDA(analog pin 4)
	 ADD-NC
 */


#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 Serail band 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();
}