A photodiode is a semiconductor device that converts light into electrical current. Si photodiodes. In this tutorial, you'll learn how to do Arduino Photodiode Interfacing and use the BPW34 photodiode with Arduino as a light intensity sensor. This can be used for detection and measurement applications, or for the generation of. A light-receiving module (100) is provided with a TO-CAN package (103) having a metal base body on which a photodiode (PD) (101) for converting an optical signal into a current signal, a trans-impedance amplifier (TIA) (102) for converting the current signal into a voltage signal, and a dielectric.