Run-away class

I had tried to make a class to teach how to make basic PCBs. The project was a simple RGB LED and and some resistors to limit the current so that it could be driven directly from the pinouts of an arduino. Unfortunately, I got a bit out of hand in creating material. The part introducing students to LEDs, PWM, measurements of luminescence, and basic V=IR  stuff is mostly complete.

In hopes these documents may be useful to someone else, I have uploaded them here.

Light, LEDs, and Human perception
Questions
There is also a sorely incomplete HTML file here.

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