LED Audio Spectrum Analyzer HELP Needed!

Discussion in 'The Projects Forum' started by Xevious809, Jun 21, 2013.

  1. Xevious809

    Thread Starter New Member

    Jun 21, 2013
    I'm slightly new to circuitry and I'm designing a 30x20 (30 Wide, 20 High) LED matrix for this project and I really have no clue what materials I need to make this possible.
    I will obviously be multiplexing the lights and am not sure if I should, and by what dimensions, break up the matrix to make it easier to apply to my arduino. (Someone suggested 30x8, 30x8 and 30x4)
    I don't know what circuitry components I need, or the resistance needed for the cathode and anode ends of the LED Matrix (LED info down at bottom).
    Any direction or guidance for the matrix and even the end product, the audio spectrum analyzer, would be greatly appreciated.

    5v Input ~>

    LED: 5mm blue
    3.0-3.4v / 24mA max / 13,000 mcd

    Whatever makes it the brightest without burning up is preferable.

  2. MrCarlos

    Senior Member

    Jan 2, 2010
    Hello Xevious809:

    In these cases it is faster if you google for a while. There are tons of information there.

    For example, the attached document I found on google.com.
    Inquire by Audio Spectrum Analyzer.

    About limiting resistor value for the LED's is calculated using the following formula: R = (Vcc - VF) /IF, where:

    Vcc is the voltage level applied to the circuit.
    VF is the voltage drop on the LED when the current flowing through it IF.
    IF is the current required for the LED lights.
    VF and IF are specified in data sheets for the LED concerned.

    I hope this information will be useful.
    #12 and absf like this.