Our video shows green LEDs, but you can definitely use other colors. In addition to our USB NerdKit microcontroller kit and a wall DC adapter, you'll need: Photo Here's what the finished product looks like: There are some schemes that you can use to control even more LEDs (see Charlieplexing), but part of the tradeoff is that the LEDs would be on for a shorter fraction of the time, so they'd be less bright.Įngineering is all about making smart tradeoffs: here, we're going with somewhat fewer LEDs, but they'll be brighter and the wiring will be much simpler. We also use one more trick - the fact that diodes only conduct in one direction - to double the number of LEDs you can handle with the ATmega168 microcontroller. This project makes use of row-column addressing, which lets us control lots of LEDs without having one wire going to each one. Ready to build your own LED array? Find more details on our Welcome, visitors! We had such a tremendous response to this video tutorial that we decided to make it into a kit of its own!
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