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Introduction to Mold Making & Casting
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The FastLED files are what is called a "Library". If your library is not in the right place, as is indicated by the error message you should also notice that the word FastLED and other words are not colored in your Arduino sketch editor window.Assuming you are using Windows, You should find a folder called "libraries" in the Arduino folder in your Documents folder. Put the FastLED folder and it's contents in there. Open your StrangerThings.ino sketch. The first thing you should notice is that the word FastLED is now colored. Then it should compile.
Great instructable. If you can improve the final step by detailing a way to get holes drilled precisely then I would be using this process a lot. I could not drill an accurate series of holes for an IC in an 8 pin DIP, let alone any of the packages I might use with many more pins than this.
I thought about using drawer slides, but since CNC machines make a mess I figured the slides would easily become clogged. Has that been a problem for you? I just tested moving a gantry using M6 1mm pitch threaded rod from my local hardware store. I wanted to be able to turn the rod once to move the thing 1mm. I found that 100 turns moves the gantry 103mm. Not accurate enough for me. Has this affected anyone else's plans?
Correct me if I am wrong, but if I want a program on the arduino to control the speed of the motor, then the potentiometer is completely irrelevant? I say this, because another instructable shows how to control DC motor speed with a potentiometer, but no arduino. I'm not sure what is gained by directly controlling the motor speed using an arduino AND a potentiometer.