a push button as input and LEDs (2-3 -> depends on your design) as outputs - Ticker counts 1-2-3-4-1-2-3-4 indefinitely in ticker periods of 500ms (in total 4x500 makes 2 seconds). Show this counting in serial output. - Count button press within these 2 sec periods. Show press count in serial output as well - If button press counter is greater than 3 within a 2 sec interval, an output LED toggles.

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Fast Fourier Transform Concepts

The algorithm used to convert a sequence to its Discrete Fourier transform (DFT) is known as the Fast Fourier transform. It can be used for both DFT and IDFT (Inverse DFT) transformation.