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PI backend Atmega328P and firmware

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  • #46
    Updated schematic, DipTrace file and firmware for the digital volume version.

    The median filter had to be scaled back to 5 samples due to the extra overhead by the PWM interrupts.

    Click image for larger version Name: Schermopname (389).png Views: 311 Size: 98.0 KB ID: 426238


    [ATTACH]n426240[/ATTACH]

    Diptrace file [ATTACH]n426239[/ATTACH]


    Firmware [ATTACH]n426241[/ATTACH]


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    • #47
      Please excuse the dumb question but I assumed the audio to be a PWM frequency within the selected range in software ie 400-1000Hz. How does the timer convert this high freq PWM to audio?

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      • #48
        Originally posted by Gunghouk View Post
        Please excuse the dumb question but I assumed the audio to be a PWM frequency within the selected range in software ie 400-1000Hz. How does the timer convert this high freq PWM to audio?
        It's explained here in detail.

        Digital volume for square waves in Arduino Nano. - Geotech Forums
        https://www.geotech1.com/forums/forum/technology/programming/419741-digital-volume-for-square-waves-in-arduino-nano
        This library is good for any Atmega328P board to generate square waves at controllable volumes. It replaces a mechanical sound pot by programattically setting the volume via a menu and up/down buttons, rotary encoder etc. It can even modulate the sound with attack, sustain and decay to (see examples inlcuded in the library).

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        • #49
          Ok thanks. Digesting

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