Arduino ESP8266 driver for BH1750 light sensor

To use:

1. Create an instance of the BH1750 class
2. In setup():

• initialise the Wire library (for I2C)
• call the begin() method of the BH1750 instance with the I2C address of the sensor

3. In loop(), call the read() method with the address of an int variable as argument. A return value of zero indicates a successful read, with the light level in the variable passed as argument. A negative return value indicates failure.

Example:

#define BH1750_ADDR   0x23  // Default I2C address
#define SDA_PIN       5     // I2C data pin - GPIO 5 (ESP8266 "D1")
#define SCL_PIN       4     // I2C clock pin - GPIO 4 (ESP8266 "D2")

BH1750 bh1750;

void setup()
{
  Wire.begin(SDA_PIN, SCL_PIN);
  bh1750.begin(BH1750_ADDR);
}

void loop()
{
  int level;
  int ret = bh1750.read(&level);
  if (ret >= 0) {
    // Light level in 'level'
  } else {
    // Error number in 'ret'
  }
}

NOTE:

• the above example uses a global instance of the BH1750 class - you can also use new BH1750() if required.