The OPT101 is a light intensity photoelectric sensor, the chip integrates a photodiode and a specially optimised operational amplifier. The transparent package allows the photodiode to have a larger sensing surface, higher sensitivity, and a wide spectral response range (infrared to visible 300nm-1000nm).

VCC: Power Supply Positive Pin
-V: Negative power supply pin
-IN: Internal operational amplifier inverting input and internal photodiode negative terminal, not connected or applied in the operational abandonment feedback.
1M: internal 1MΩ feedback resistor input
OUT: Amplifier output
COM: positive terminal of internal photodiode, generally connected to GND.
Note: The module is not welded with CEXT external capacitor and REXT external resistor, leaving pads to facilitate the expansion of their own applications.