8 Channel instead of 16

[alwaysdamian]

Hi Scott, How are you?

Just a quick question please. I have been playing around with FFT and the LED's for a few days and decided to replicate your design. When running the 16x16 matrix, I have noticed that there are always 2 band per frequency. This seems to happen on each pattern.

I have confirmed the Num_bands are 16 and that the 16 band frequency table is being used.

If i'm not being 100% clear, I am unable to do a frequency sweep, with 1 bar at a time.

Let me know your thoughts. Thanks so much Damian

[s-marley]

Hi Damian,

Thanks for getting in touch. I'm not sure what's going on there as it definitely used to work correctly. As a quick bodge, try changing BAR_WIDTH = 1; and see if that makes it work. I'm afraid I don't have time to investigate this further at the moment.

Cheers,

Scott Marley

Space & Science Education

http://www.scottmarley.com

@.***

TEL: 07732097058

On Sat, 30 Apr 2022 at 13:01, alwaysdamian @.***> wrote:

Hi Scott, How are you?

Just a quick question please. I have been playing around with FFT and the LED's for a few days and decided to replicate your design. When running the 16x16 matrix, I have noticed that there are always 2 band per frequency. This seems to happen on each pattern.

I have confirmed the Num_bands are 16 and that the 16 band frequency table is being used.

If i'm not being 100% clear, I am unable to do a frequency sweep, with 1 bar at a time.

Let me know your thoughts. Thanks so much Damian

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[alwaysdamian]

Hi Scott.

Thanks for getting back to me.

I had a "2AM, realization" last night and found the culprit. I realized that when ever 2 bands lit up, they were missing every 2nd LED (it was off). Furthermore, if i had to merge the 2 bands together, it would be 1 complete band (if that makes sense). This made me re look at the wiring and setup.

I initially wired up the matrix in a "progressive" layout. I also looked at this and tried changing the Serpentine between True/false, i saw no change. Because of this, i thought it was a software fault.

After rewiring up the matrix into a serpentine layout, all seems to be correct!

Hopefully you don't mind 1 more question. Did you ever struggle with interference on the LED strips? At a height of 9 LEDS and 16 long, everything works as expected. If i increase the height, random LED's near the top randomly light up, i assume this is caused by noise from the LED's.

Have you experienced anything like this?

Thanks again for you time and assistance. Have a wonderful day. Damian