Design and Implementation of a Musical Water Fountain Based on Sound Harmonics Using IIR Filters

Abstract

IIR digital filters are used in many types of digital signal processing (DSP) applications. One of these application fields is the sound which occupies an effective area of our life and takes number of functions like communication, entertainment, etc. These filters are used to separate the mother signal into its comprising partners groups. In this paper, the design and implementation of musical sound driven water fountain has been covered. The scenario is to decompose the adopted sound signal into four frequency bands (where each band occupies narrow range of frequencies and represents the output signal of its producing IIR filter) and allow each band to drive one submersible pump via an AC variable speed drive (VSD) unit. The Arduino based IIR filter's output is applied to the analog voltage control terminal of the AC drive unit to control the magnitude and frequency of the voltage supplied to the pump to control the head of the water and at the same time the light intensity of colored light lamps. The hardware implementation has been done by four groups of components, where each one consists of one Arduino microcontroller (to function as an IIR filter), one AC drive unit to map the filter output into variable voltage variable frequency voltage signal, one submersible pump to produce variable head water burst (the head follows the filter output) and one colored pump to display the filter output behavior in visual mode.