Chapter 5 Letter Magnets Working with Light-Emitting Diodes (LEDs)
In the modern world, we often see electronic signs, made of out of light-emitting diodes (LEDs), that are scrolling or flashing letters and words. These signs might tell us about anything from construction on the highway to the price of a sandwich in a deli. No matter what you want to say, to make letters with LEDs, you need to use a lot more LEDs and electrical connections than you have in your previous projects. In this chapter, you will learn about a few new concepts having to do with electric current, voltage, and resistance. In this project, you will make refrigerator ...
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