ADC is configured to sample input signal with the clock frequency of 38.46khz. Please make sure R1 & R2 (refer schematic) are of same value.Īrduino board (ATmega328P) has built in Analog To Digital converter (ADC) which is being used here for converting input audio signal into digital samples. Resistor values are not very strict, you may choose any closest value. 5 volt power supply (usb supply will do).Push button switch - 1 no (normally comes with Arduino kit).Arduino Nano or Uno (I tried with Nano and Uno, must work with other models as well).Audio can be fed from headphone output or Line-out of music system / amplifier. Prototype use 32x8 LED matrix display, this can be changed and easily modified.Both left and right channels of audio signal are mixed so that you don't miss any beat.Five different display modes are supported which can be switched with the push button.Uses easily installable libraries “arduinoFFT” and “MD_MAX72xx”.Main features of this frequency spectrum analyzer Components used in this project are low cost items and are easy to assemble. Expected audience of this project is any audio enthusiast, student or a beginner who has basic understanding of electronic components, Arduino and C programming. This project is for making a 32-band audio (music) frequency spectrum analyzer / visualizer using Arduino.
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