Відео

@@lechoo I've never used a HUB75E panel. I don't own any. I've heard they are dumber and need to be driven in a totally different way. I don't understand which problem does the 8x8 matrix solve. The mapping is doable but they aren't four times cheaper. It would be more expensive. 16x16 matrix is the biggest and you need fewer of them. Wiring four times more panels is a chore. Even if using the smaller panels was cheaper you would pay for it with your time. Please link these 8x8 matrix PCBs for me. I buy all my stuff from AliExpress. It's the cheapest and has multiple companies manufacturing the panels. Maybe you buy them from somewhere more expensive.

@@acidangel162 My earlier reply seems to have been deleted by google's strange algorithms... I can't put a link, on AliExpress these 8x8 panels are available under the name 'WS2812 LED 5050 RGB 8x8 64 Bit LED Matrix Module' - they are on a solid PCB, not a flexible one. I recently bought them for $1.29 per piece, and free shipping. The HUB75E panels have bare RGB LEDs, shift registers and multiplexers. In large displays they are controlled by an FPGA or ASIC, but ESP32 has libraries that use I2S DMA to send data to the panel at high speed, with clock up to 20MHz. The HUB75E panel uses 14 pins for control them.

@@acidangel162 I can't put a link here, on Ali these 8x8 panels are available under the name 'WS2812 LED 5050 RGB 8x8 64 Bit LED Matrix Module' - they are on a solid PCB, not a flexible one. I recently bought them for $1.29 per piece, and free shipping.

@@lechoo How expensive are they? Because I can buy the 8x8 PCB for 2 € each. That would be 8 € for 16x16 which is exactly the same price as these flexible panels. If these PCBs were 16x16 I might buy them but as such small PCBs they are more hassle than they're worth.

Itte ainakaa muista enää 04-08 konemetsistä paljoo mitää ni ois kiva muistella jos joku ois kuvannu

paskaahan se on mut ihan missä ootki sua voidaa kuvaa paitsi kotona. ehkä.

The main organizers of Kosmos Festival are playing. These are the people who first dreamed up the festival more than a decade ago. That's why there's so many people partying and paying their respects. I had the privilege of doing my own part for this beautiful event. Going shopping with a big trailer before the event, running some small errands during it and hauling 160 liters of gasoline for the ATVs for the tear down the day after the festival. You know, all the ingredients of an amazing festival.

Polly & Miazu

Laita korvatulpat

Onhan se kovalla kun kuvattu kaiuttimen vieressä

Musiikki oli kyllä kovalla. Siksi tuo musiikki klippaa nauhoituksessa ja siksi olin tuolla kauempana kuvaamassa. Kosmos Festival on myös metsäbileet, niin voi halutessaan vaikka istua kaukana mättäällä ja nauttia musiikista. Ite ettin tanssilattialla sopivan paikan, missä musiikki kuulosti hyvältä, mutta korviin ei sattunu. Monet käytti korvatulppia, mutta ite säädin äänenvoimakkuutta sijoittamalla itseni sopivaan kohtaan.

Itsellä on mennyt nuorena vasemmasta korvasta 90% kuulosta sukellusonnettomuudessa. Kuulen kaiken monona nykyään ja tinnitus. Suojatkaa kuulonne hyvät ihmiset! p.s. En tajua miksi en koskaan mennyt tuonne vaikka asuin Mikkelissä vuosia. Tomorrowlandiin kyllä pääsin ja moniin kunnon reiveihin.

Minkälainen onnettomuus se oli? Kannattaa käydä. Upeat metsäbileet. Siellä voi saunoa ja uida hippien kanssa.

The source code is a little dirty with a bunch of stuff hardcoded. I wanted to clean it up. I can publish it but would just the binary be sufficient? I'm also working on the Windows version of this program. You can come to my discord channel so you can test the new versions that I make and maybe give some feedback. discord.gg/vbdbMmp5

I'm done cleaning my source code. I turned all the hardcoded values into command line arguments. I just uploaded the most recent version to my GitHub repo. Go hog wild with all the options and OpenGL support.

Now it even has transparency and a bunch of other controls

What do you mean? I use Bluetooth. Or do you mean the names of all the buffers in my C program?

@@acidangel162 thanks, I didn't realize it was bt. Thought it was line in.

Oh no. The ADC on the esp32 has low bit depth and is quite noisy. Only perfect digital signal is good enough for me. Couldn't get such high accuracy with nothing but Bluetooth.

Thanks for your kind words. Much appreciated 🙂

What about the dogs, I wonder 🤔

You can hear until around 16 kHz. My hearing cuts off at around 14 kHz. All the more reason to use a spectrum analyzer so that I can see what I can no longer hear. UA-cam cuts off higher frequencies at 15-20 kHz depending on which codec is used. That's why I added the link to the losslessly compressed audio file. That goes up to 20 kHz. My spectrum analyzer can go up to 18.5 kHz because that's where the A2DP Bluetooth codec cuts off frequencies. The algorithm can go up to 22 of 24 kHz depending on if Bluetooth uses 44.1 or 48 kHz sampling rate. Cutting off higher frequencies makes sense. They can use the saved bandwidth for encoding sounds we can actually hear. Classic Bluetooth has quite limited amount of bandwidth. Your soundcard and amplifier will have their own cut off frequencies. Probably around 20 kHz. So even though the audio files can carry frequencies higher than that, they will get cut off before hitting our speakers. Animals can hear all the whining our electronics scream at frequencies above 20 kHz. We don't use microphones to inspect our homes for these ultrasounds. We should. Imagine spending your whole life with a high pitch whine playing in your ears. People don't care if their TV screams constantly at frequencies humans can't hear. We should. The pets are not free to go. They are incarcerated in our houses.

Do you mean is it available commercially? It is not. It's my own algorithm crafted with love with these delecate programmer's hands. The current version has 7 times more pixels. There isn't a tutorial... yet. But two other people have made this screen with my assistance. There will be a tutorial some day after I have iterated on it's construction just a little bit more.

Thanks MSGEQ07 was amazing in 2004 when it was released but is unfathomably outdated 20 years later. This program builds only on 1.0.4 version of Arduino IDE and a two year old version of pschatzmann's ESP32-A2DP Bluetooth audio library. Anything newer uses too much ram. I'm running really low on it and even with these obsolete libraries I only have 10 KB of free ram. You can contact me using this discord server discord.gg/88Jmr7rZ

I haven't shared the pinout. I've only built it on a perf board. There are no sketches. I thoroughly enjoyed your video about MSGEQ7 and FFT. The analog chips are nowhere as good as digital FFT and it doesn't even cost any money. It's also easier to build since there is no wiring. This project is quite finicky. I ran out of ram. The sketch only works on Arduino ESP32 2.0.4 or lower and an old version pschatzmann's esp32-a2dp library. It supports only some of the Bluetooth transmitters. I'm currently in the process of migrating to esp-idf. It has amazing compatibility with all the Bluetooth transmitters I have tested. Is there a way I could contact you directly? UA-cam doesn't have that funtionality anymore. You could build my mini version of this spectrum analyzer in fifteen minutes with these instructions to get an idea what my algorithm is capable of. github.com/yliniemi/AcidAnalyzerOLED

Both frequency and amplitude are in logarithmic scale. Frequencies go from 20 Hz to 18. 5 kHz. The dynamic range of the audio power is 50 dB. That's the same dynamic range the vinyl records have so it's plenty. You can actually make a smaller version of this for 10 € with this tutorial I made. You can check out the scale for yourself. github.com/yliniemi/AcidAnalyzerOLED

Here you go 🙂 github.com/yliniemi/AcidAnalyzer

@@acidangel162 Thanks

I just checked the sound quality of INMP441 on this youtube video and it seems acceptable ua-cam.com/video/3g7l5bm7fZ8/v-deo.html And horrible in this one. ua-cam.com/video/qq2FRv0lCPw/v-deo.html I do have these little microphones and could make a version with them. The reason I didn't use them was because the audio quality isn't anywhere near as good as the digital goodness that we can get with Bluetooth.

Kymmenen kertaa hitaampi. Vissiin 240 fps. Nauhoitin kolme minuuttia kunnes kännykkä ylikuumeni. Siksi se video tuossa lopussa skippaa ruutuja.

It's trivial. Just add a multiplier to time. It's on line 66. ... animationStep*1.4* ... for example. Use number bigger than 1.0 to speed it up and numbers smaller than that to slow it down. You can get the animation to go backwards if you multiply it with a negative number.

You're welcome 🙂 I researched the shit out of the algorithms. I'm hoping this program will gain popularity and people will have access to fast and accurate open source spectrum analysation on Linux, Windows and MacOS. Currently only Linux is supported and only Pipewire protocol which is the default sound API in Debian 12 and Ubuntu 23.04

That's a good question 🤔 I haven't drawn schematics or anything. I just made the circuit on a perf board. Should I take a picture of it?

Thanks! Your work looks great too

I keep making changes to my GitHub repository. Every new version is different. The RGB background is still there but it's commented out. I'm planning to make a way to switch between them on the fly somehow but I don't know how. I have only four input only pins available on the esp32. Buttons? Sliders? How do you think I should do the selecting?

@@acidangel162 I want to turn off animation playing in the background and put RGB in the band

You want bands to be rgb. Should the background be black or some other color? Maybe the inverse of the band color. Meaning in the right side the band would be blue and the background would be yellow.

@@acidangel162 Yes, I want RGB for the band and black for the background

Thanks 🤗 100% flash. That's a lot. I would have been happy with 60% flash. What should I do to educate? Release the source code with agpl 3.0 lisence? Include an svg file for laser cutting the frame? What else? Create a pcb to be cut by a cnc router? More? A tutorial video of how to glue the panels to the plywood?

@@acidangel162 to start with some schematics/wiring would be good, the rest is left up to the builders preferences...

@@bunnykiller Thanks. I'll do that. What program should I use to draw the schematics? Preferably something open source since I'm poor. To be honest. I've never drawn any schematics. I've always just built the circuit.

@@acidangel162 well then repost the schematics you used to build it... or add a link...

I can't repost something that I've never had? The schematics don't exist and have never existed. I just made the circuit based on an image in my head. Would a picture of the circuit be sufficient? Perhaps you can help me draw a circuit diagram based on that.

Thanks dude :) I get 120 Hz. I only use one esp32 for everything. Nothing else. It's powerful enough. I just had to select the FFT library carefully. I did a lot of testing and research. ArduinoFFT is 10 times slower than the library I use. It's listed on the comments of my program in my GitHub repository. An esp32 is super powerful. It's as fast as a 200 MHz Pentium from the mid 1990's. That thing could run quake. Of course the esp32 has other limitations like having only 520 kB of ram and it has to do some things in software that the PC had hardware for. But when doing raw calculations they are quite evenly matched. Oh yeah. You asked how I got so many Hz. I do overlapping FFT with kaiser 3 windowing. The samples are prepared by core 0 and analyzed by core 1. Does this clear things up?

Yeah. A big one. I made it myself. It's 112 cm x 32 cm. You can't really tell the scale that well in this video but in my most recent short you can tell the size easily because you can see my window and front yard for reference.

That's a great idea! What do you want to know? The sketch I can share easily. The schematic is only in my head. I don't know how to use any of the programs for drawing it.

​@acidangel162 ha.. Just saw your reply.... I know.. I know.... I'm getting old... What leds are u using? Ws2812b ? What arduino board? I'd love to see the sketch....

Thanks! Old classic.

Thanks :) As your programming advisor I'm inclined to advice against doing frequency analysis with electronic filters. Unless you just want to practice soldering. Then go ahead. You can perhaps build 3 bands per octave but not much more. The steeper the filter the more complicated the filter needs to be. And filters can't do windowing which is the magic sauce in my implementation. I spent two weeks just researching which windowing function to use to get the best balance between definition and the wideness of the main lobe. I read a lot of scientific papers and chose kaiser 3 windowing. With FFT you can get enough definition to see what note is playing. That means more than 12 bands per octave. Good luck building something that precise with electronic filters. I'm no trying to demoralize you. This is just what the limitations are and I want you to be aware of them before you commit. I'm sure you can build something really nice with perhaps 20 bands but to get more than that you have to go digital. If you're satisfied with 20 bands then go right ahead. Not every frequency analyzer has to be a 112 band behemoth like my current prototype.

@@acidangel162 really appreciate the advice🙂 thanks brother. I am only going for 10-15 bands and I have already made the circuit in simulator and seen its output, it's good enough for my purpose and I am also planning to build the same but from programming using FFT where your work will be great reference. Again thank you so much.

@@dhruv_195 Great to hear that you are aware of the limitations. My work here is done. 15 bands is totally doable with electronic filters. Good luck 😇

Maybe in a few months. I have a new version in the works that has four times the pixel count and twice the speed. Just check out my more recent videos.

@@acidangel162 already seen them all... Nice peice of art excellent job

Sure! Why not? It's just a different type of screen.

@@acidangel162 i saw this but your code does not apply on this setup

ua-cam.com/video/GF_i0EnUEro/v-deo.html

@@mohammadmujahed2724 Of cource not. If you change the screen you have to change the funtion that takes the frequency bands and draws them on the screen. How tall and how wide is your screen?

@@acidangel162 32*8

Could you do that and then add a pull request for the schematics in my GitHub repository? I don't have Arduinos any more so I can't even rebuild this even if I wanted to. Here is an example of the stuff I'm up to nowadays. ua-cam.com/video/hvtLwPlqViQ/v-deo.html

This has 14 16x16 ws2812b panels. That's 3584 pixels. I would have put 16 panels but the laser cutter that I have access to isn't big enough for the 132 cm frame..