The LED comes into play by shining known wavelengths of light on the surface being measured ... s an Arduino doing the measuring instead of a PIC. So why isn’t that sensor shown in this picture?

Like Timothée Chalamet, LED light masks are everywhere right now. Scroll TikTok, take a walk down the aisle at Sephora, or ask your friends IRL at brunch and you're likely to be bombarded by the ...