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Tested the LED matrix

Proudly featured on the cover of the March 2018 issue of Nuts and Volts magazine!

I'm having some trouble keeping the kit in stock since the Nut and Volts article came out. If I'm out of stock, try ordering from the Nuts and Volts store at
Thank you for your patience and understanding!

At this point, I’m able to operate the LEDs of the test circuit by manually applying +5V and ground to the four lines that will be connected to the I/O ports on the microcontroller. I can light any one of the 12 LEDs without having any of the other LEDs light up. This is pretty cool, the technique works!