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ATtiny13 – dance lights with FFT

This project shows how to synchronize live music and lights using DSP/DFT in real-time on ATtiny13 which offers only 64B RAM / 1024B FLASH.

Łukasz PodkalickiŁukasz Podkalicki
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  • Łukasz PodkalickiŁukasz Podkalicki

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attiny13 dsp fft DFT disco liGhts Party Lights Dance Lights avr led

This project is submitted for

  • The 1kB Challenge

This project was created on 12/08/2016 and last updated a year ago.

Description

This experimental project shows how to use ATtiny13 to synchronize live music and lights with only a few additional components required. Project uses single ADC (Analog to Digital Converter) channel for signal acquisition and some DSP (Digital Signal Processing) calculations that in real-time separate three frequency bands and make the LEDs dance in sync with the music. This project also proves that real-time DFT (Discrete Fourier Transformation) is possible on such small MCU like ATtiny13, which offers only 64B of RAM and 1024B of FLASH. Project doesn’t require any specific equipment and the parts costs are below 3$.

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mr.jb wrote 12/10/2016 at 17:58 • point

>ADCSRA |= _BV(ADPS2)|_BV(ADPS1); // set ADC division factor 64;

>F_CPU=9600000

Are you sampling ADC with 150kHz ? and if so why ?

A fun twist of your code would be to put it inside a flash-light driver

http://flashlightwiki.com/AVR_Drivers

  Are you sure? yes | no

Łukasz Podkalicki wrote 12/10/2016 at 21:31 • point

Hi, after I read your comment I realized that I made a copy-paste
mistake. Of course, this example will work with higher sampling rate,
but it result in poor quality. Project has been tested using @1.2MHz
internal clock source. ADC division factor is set to 64 so the ADC
sampling frequency is 18750Hz (F_CPU/64). Thank you!

NOTE: “copy-paste mistake” has been fixed on both blog and github.

  Are you sure? yes | no

mr.jb wrote 12/10/2016 at 11:51 • point

NICE ! ( less is more ;-)

You should put it into 1k challenge ...

/JB

  Are you sure? yes | no

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