Schlagwort: Spectrum analyzer

  • DIY spectrum analyzer is an easy project for beginners

    DIY spectrum analyzer is an easy project for beginners

    Reading Time: 2 minutes

    Spectrum analysis is a technique that allows someone to observe the amplitude of various frequency ranges within a signal. The most common use case is in the world of audio engineering, as it is useful for tuning audio output. It can, for example, show you that a particular audio signal has little amplitude in the low bands and that tells you that you should turn up the bass. If you want to try this for yourself, Sam Dartel designed a DIY spectrum analyzer that is easy for beginners to build.

    For a spectrum analyzer to work, it needs to be able to break an electrical signal down into a series of frequency ranges. In an audio signal, frequency is pitch. That means that higher frequency ranges correspond to higher notes in the audio. This spectrum analyzer utilizes an MSGEQ7 IC, which is an equalizer filter, to pull seven frequency ranges from an audio signal. It outputs the peak of each band, giving a real-time reading of each band’s amplitude.

    There are two versions of this spectrum analyzer: one powered by a battery and one powered via USB. Both are shields for An Arduino Nano board, which takes the output from the MSGEQ7 and uses the FastLED library to set the number of LEDs lit on seven WS2812B individually addressable RGB LED strips. Each strip is a 2D display and that is enough for the amplitude of each band, but the color and brightness of the LEDs introduce two other possible dimensions. This spectrum analyzer uses those for different effects patterns.

    [youtube https://www.youtube.com/watch?v=hkR0L8pilXs?feature=oembed&w=500&h=281]

    To build this spectrum analyzer, you’ll need to have one of the two shield PCB designs fabricated. All of the components are through-hole to make assembly easy.

    The post DIY spectrum analyzer is an easy project for beginners appeared first on Arduino Blog.

    Website: LINK

  • This ‘crazy’ spectrum analyzer visualizes tunes with four Arduinos and 504 LEDs

    This ‘crazy’ spectrum analyzer visualizes tunes with four Arduinos and 504 LEDs

    Reading Time: 2 minutes

    This ‘crazy’ spectrum analyzer visualizes tunes with four Arduinos and 504 LEDs

    Arduino TeamJuly 26th, 2020

    Spectrum analyzers are a great way to visualize music, and “TUENHIDIY” came up with an interesting take on this device using not one, but four Arduino Unos.

    Each board receives the same sound input via a 3.5mm audio jack, and separately processes it to break out the left and right channels, as well as upper and lower frequency ranges using fast Fourier transforms, or FFTs.

    36 different bands are shown on four LoL Shields, with each 9×14 Charliexplexed LED matrix attached to an Uno, for a total of up to 504 individual points of light. Everything is put together on an acrylic plate, and powered by a portable USB battery.

    TUENHIDIY is quick to note that it’s a “crazy project,” but as seen in the video below, it looks like a lot of fun!

    [youtube https://www.youtube.com/watch?v=uB-a2VwH_34?feature=oembed&w=500&h=281]

    Website: LINK