Mikroe Oximeter 3 Click is ideal for measuring blood oxygen saturation. The board features the Vishay Semiconductors VCNL4020C-GS08 High-Resolution Digital Biosensor. It combines an infrared emitter, PIN photodiode for biosensor functionality, ambient light sensor, and signal processing IC in a single package. It supports an I2C serial digital interface and has the programmable interrupt function. This offers wake-up functionality when a proximity event or ambient light change occurs.