The BH1750 Ambient Light Sensor Module is based on the digital Ambient Light Sensor IC BH1750FVI developed by ROHM Semiconductor. It is a digital IC with built-in 16-bit illuminance to digital converter.

The output of this sensor is in LUX (lx), so it does not require any further calculations. Lux is the unit to measure Light intensity. It measures the intensity according to the amount of light hitting on a particular area. One lux is equal to one lumen per square meter.

For communication with external devices like ESP32, the BH1750 Ambient Light Sensor IC uses I2C Bus Interface.

Pin Description
VCC – 3.3V to 3.3V

GND – VCC

SCL – SCL

SDA – SCL

ADD – I2C Device Address ( Kept Open )

You can read this instructable for information on BH1750 light sensor