# Building a Square wave

Any complex waveform can be made up of simple sinusoids.

A square wave is made by first starting with a sine wave then adding every other nth harmonic at frequency nth * the base frequency and amplitude of 1/n

FFT breaks down a waveform into its sinusoidal components to measure the amplitude of the frequencies.

1. Additive sine waves combine to form a complex square wave.

2. The FFT graphs the harmonic frequencies as the square wave takes form.