Disco Board Project

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Project Overview

The intent of the Disco Board Project is to construct a device that will synchronize the flashing of lights with peaks in certain frequency ranges in a waveform; namely, components of the beat in songs. This will be accomplished using a real-time processing component of MATLAB coupled to a series of relay switches. The MATLAB component (specifically, the audio processing toolkit in SimuLink) will read input from a computer port (most likely a microphone in or line in). It will apply a series of bandpass filters to the input data; the frequency ranges that are "passed" will be chosen such that they encapsulate the relevant parts of the input. In the case of a song, these would be frequency ranges corresponding to the kick drum, snare drum and hi-hat. The output of the bandpass filters will then be evaluated as an absolute value (giving the magnitude of the signal) and then smoothed with a low-pass filter. An IF statement will then determine if the magnitude of the signal has exceeded a prescribed value; when it does, the program will send a signal to a relay and a light will flash. If all components work as described above, the user should be able to notice clear correlation between the beats of their song and the flash-pattern of the lights, and will have some pretty bangin' lighting for their next party.

Required Materials

4 - 120v AC Relays - available from Ed Jaoudi 4 - Female 120v AC sockets, grounded, surface-mountable 4 - 470Ω resistors 4 - 2v LEDs 1 - Terminal block, 16- to 22-ga. wire 1 - Male 120v AC extension cord, grounded

Contingent on method of interface between computer and relays: - Method of interface - must be able to read from USB or serial, send 3.7 to 32v DC - Appropriate wiring to connect interface to relays