ATtiny13 – dance lights with FFT

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

>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

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

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.

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

NICE ! ( less is more ;-)

You should put it into 1k challenge ...

/JB

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ATtiny13 – dance lights with FFT

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