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Test schematic

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!

I created a test schematic to run 12 LEDs, the buzzer and three pushbuttons and monitor the 60Hz frequency. The LEDs and pushbuttons will be interfaced with just four I/O lines of the microcontroller This will allow me to test the concepts that will enable me to make the full circuit consisting of 182 LEDs and four pushbuttons interfaced to 14 I/O lines. For both the test and final circuits, the buzzer and 60Hz will each have a dedicated I/O line. Six I/O lines for the test circuit, and 16 I/O lines for the final clock circuit.