AVR spectrum analyzer

audio spectrum analyzer

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This spectrum analyzer uses character LCD and two ADC inputs of Atmega 328.

Microcontroller converts analog signal to digital and calculates FFT. Data is displayed in vertical bars on character LCD. VU meter is planned as a horizontal bar. External connections - Your audio source and optional auxilarry controller to connect the device to Your own hardware.

Main features:

  • Selectable frequencies of spectrum to display (512 possible frequencies)
  • Configurable via serial connection (TTL level)
  • Any character LCD will fit - from 16x2 to 80x4

  • 1 × Atmega 328 Microcontroller
  • 1 × LM324 Quadruple operational amplifier
  • 1 × LM7805 5 volts regulator
  • 1 × 20x4 character display
  • 1 × 20 MHz quartz

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[this comment has been deleted]

CrazyChip wrote 08/10/2014 at 12:50 point
Thanks for reply. Yes that's the way I route these jumpers. I was just wondering how to name them - "jumpers", "wire jumpers"? When I hear "jumpers" the first thing that comes to mind is these jumpers:

  Are you sure? yes | no

CrazyChip wrote 07/31/2014 at 12:21 point
Hi everyone,
how do You call wire jumpers which replace traces on one-side PCB's?

  Are you sure? yes | no

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