Chapter 4. Gadget: LED Sensitivity Tester

Before building and using the LED photometer, we first need to figure out exactly which wavelengths of light each of our LEDs is sensitive to. Otherwise, we won’t be able to get good data with the photometer. Unfortunately, no LED datasheet that we’ve ever seen troubles itself with listing LED input wavelength, because LED manufacturers generally don’t think of their products as input devices. Fortunately, we can determine input wavelengths with a gadget we can build ourselves: the LED sensitivity detector.

Mission: Inputtable

Your mission, should you choose to accept it, is to determine the peak input wavelength for a series of LEDs. You will do this by shining every wavelength of visible light, from 350–700 ...

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