This is an ultraviolet sensor board which will directly output UV index value via the I2C interface. It is compatible with both 3.3V and 5V levels. Features: Integrates Si1145 chip with embedded ADC, detects not only ultraviolet, but also ambient light intensity. Directly output UV index value via the I2C interface, needs no calculation. Supports interrupt output, programmable upper/lower threshold. Onboard voltage translator, compatible with 3.3V/5V operating voltages.