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2820 LED Audio Visualizer Project

Zinic

Hey guys,

I built an LED project that displays the audio frequencies of any song in real-time and the outcome is pretty neat. I have lots of examples and provided a build log of the project on imgur.

https://imgur.com/gallery/tSoa2W6

 

 

IMG_20181103_220217 (2).jpg

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15 minutes ago, Zinic said:

Hey guys,

I built an LED project that displays the audio frequencies of any song in real-time and the outcome is pretty neat. I have lots of examples and provided a build log of the project on imgur.

https://imgur.com/gallery/tSoa2W6

Neat project you got there! I don't think I would be able to look at that for more than a few seconds though. I imagine my eyes would get tired pretty quickly 

Any plans for VU meters in the future? 

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Awesome...

 

The number of leds is a bit odd, you went with 47x60 = 2980.

 

My first thought was "this sounds like a good opportunity to make some RGB tiles"

 

I would have made a 12 x 9 circuit board, and get 6..7x4 = 24..28 boards made ... ending up with 56..65x48 dot matrix screen.

 

There's a chip IS31FL3741  which does 39x9 dot matrix and is rgb aware, so each board could have 13x9 RGB leds, but I figured 12x9 would make for easier math ... : http://www.issi.com/WW/pdf/IS31FL3741.pdf

At 15mA per color, you have maximum 5A, so you could easily add a 3.3v .. 3.6v dc-dc converter on each board to reduce losses and be able to use cheaper power supplies.

A 12v ATX power supply would be enough  5A x 3.6v = 18w ... let's say 20w per panel to account for conversion losses... you're looking at 28 boards x 20w = 480w on 12v ... so a single 650w atx power supply would have worked.

RGB leds can be cheap, Digikey is typically more expensive yet they can be as low as 11 cents per led at 1000pcs in a very easy to solder package: https://www.digikey.com/product-detail/en/broadcom-limited/ASMB-KTF0-0A306/516-3906-1-ND/7917025

TME.eu has them for around 25..60 euro / 1000pcs :

https://www.tme.eu/gb/details/rf-w2sa50ts-a39r/smd-colour-leds/refond/

https://www.tme.eu/gb/details/rf-w7sp30ts-a44/smd-colour-leds/refond/

https://www.tme.eu/gb/details/rf-w2sa30bs-a15-we/smd-colour-leds/refond/rf-w2sa30bs-a15-we/

https://www.tme.eu/gb/details/fyls-5050nrgbc/smd-colour-leds/foryard/

 

JLPCB or others will make 5 boards for 10$ or whatever, and you can order a steel stencil for solder paste and you place the leds on the circuit board and heat up the board from the bottom and your leds are soldered

 

 

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