struggling with code plz help.

Projects Programming
1

i am making a 10x10 neopixel matrix vu meter i have this code (i have attached it)
but when i upload the code i get this error message.

Arduino: 1.8.1 (Windows 10), Board: "Arduino Nano, ATmega328"

In file included from C:\Users\Re\Documents\Arduino_10x10vu_10x10vu.ino:10:0:

C:\Users\Documents\Arduino\libraries\FastLED/FastLED.h:17:21: note: #pragma message: FastLED version 3.001.003

pragma message "FastLED version 3.001.003"

^

C:\Users\Documents\Arduino_10x10vu_10x10vu.ino: In function 'void loop()':

_10x10vu:74: error: 'fft_lin_out' was not declared in this scope

fft_lin_out[0] = 0;

^

exit status 1
'fft_lin_out' was not declared in this scope

can anyone help?

_10x10vu.ino (4.18 KB)

2

I will bet that you get more help when you follow the instructions, especially when you consider that some experts will not help otherwise. Here is a summary.

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Before posting again, you should read the three locked topics at the top of the Programming Questions forum, and any links to which these posts point.

If your project involves wiring, please provide a schematic and/or a wiring diagram and/or a clear photograph of the wiring.

Good Luck!

3

All of what @vaj4088 said plus there's a "Search the Arduino Forum" feature near the top of the forum page. It does actually work.

Pete

4

"there's a "Search the Arduino Forum" feature near the top of the forum page. It does actually work."

Barely. Google brings up all kinds of stuff and it's up to the searcher to wade thru it all to find something. I have a hard time just finding my own posts and I know what I'm looking for.

5

I'm betting you either don't have all the libraries installed in your /libraries folder, but that would have resulted in more errors,
or you don't have

byte fft_lin_out[11]; // or char
declared anywhere, so the sketch is using an unknown variable here:

fft_lin_out[0] = 0;

fft_lin_out[1] = 0;

and here

if((unsigned char)fft_lin_out[x] > maxW){

maxW = (unsigned char)fft_lin_out[x];
6

search for:
'fft_lin_out' was not declared in this scope

First result has a possible solution.

Pete