Hi i have a problem with code, when i upload a code i get a comunicate :
In file included from C:\Users\kaspe\Desktop\FRF9LJ5IVO3SD4B (1)\lol\lol.ino:15:0:
C:\Users\kaspe\Documents\Arduino\libraries\FastLED/FastLED.h:12:2: warning: #warning FastLED version 3.001.000 (Not really a warning, just telling you here.) [-Wcpp]
#warning FastLED version 3.001.000 (Not really a warning, just telling you here.)
^
C:\Users\kaspe\Desktop\FRF9LJ5IVO3SD4B (1)\lol\lol.ino: In function 'loop':
C:\Users\kaspe\Desktop\FRF9LJ5IVO3SD4B (1)\lol\lol.ino:84:58: warning: iteration 10 invokes undefined behavior [-Waggressive-loop-optimizations]
for(unsigned char x = grenzen[i]; x < grenzen[i+1];x++){
^
C:\Users\kaspe\Desktop\FRF9LJ5IVO3SD4B (1)\lol\lol.ino:82:5: note: containing loop
for(unsigned char i = 0; i < 11; i++){
^
Project link : https://www.instructables.com/id/Arduino-Spectrum-Analyzer-on-a-10x10-RGB-LED-Matri/
code:
/*
Written by FischiMc and SupaStefe
This sketch uses a 10x10 RGB LED-Matrix as a spectrum analyzer
It uses a FTT Library to analyze an audio signal connected to the
pin A7 of an Arduino nano. Everytime a column gets higher than
10 pixels the color of each column changes.
*/
#define LOG_OUT 0 //set output of FFT library to linear not logarithmical
#define LIN_OUT 1
#define FFT_N 256 //set to 256 point fft
#include <FFT.h> //include the FFT library
#include <FastLED.h> //include the FastLED Library
#include <math.h> //include library for mathematic funcions
#define DATA_PIN 3 //DATA PIN WHERE YOUR LEDS ARE CONNECTED
#define NUM_LEDS 100 //amount of LEDs in your matrix
CRGB leds[NUM_LEDS];
float faktoren[10] = {1, 1.1, 1.15, 1.25, 1.45, 1.55, 1.75, 1.8, 2, 3}; //factors to increase the height of each column
unsigned char hs[10] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; //height of each column
float hue = 0; //hue value of the colors
void setBalken(unsigned char column, unsigned char height){ //calculation of the height of each column
unsigned char h = (unsigned char)map(height, 0, 255, 0, 10);
h = (unsigned char)(h * faktoren[column]);
if (h < hs[column]){
hs[column]--;
}
else if (h > hs[column]){
hs[column] = h;
}
if (height > 250){
hue+=2; //CHANGE THIS VALUE IF YOU WANT THE DIFFERENCE BETWEEN THE COLORS TO BE BIGGER
if(hue > 25) hue=0;
}
for(unsigned char y = 0; y < 10; y++){ //set colors of pixels according to column and hue
if(hs[column] > y){
leds[y+(column*10)] = CHSV((hue*10)+(column*10), 255, 200);
} else {
leds[y+(column*10)] = CRGB::Black;
}
}
}
unsigned char grenzen[11] = {0,3,5,7,9,11,13,16,24,32,69}; //borders of the frequency areas
void setup() {
FastLED.addLeds<WS2812B, DATA_PIN, GRB> (leds, NUM_LEDS);
Serial.begin(115200); //use the serial port
TIMSK0 = 0; //turn off timer0 for lower jitter
ADCSRA = 0xe5; //set the adc to free running mode
ADMUX = 0b01000111; //use pin A7
DIDR0 = 0x01; //turn off the digital input for
analogReference(EXTERNAL); //set aref to external
}
void loop() {
while(1) { //reduces jitter
cli(); //UDRE interrupt slows this way down on arduino1.0
for (int i = 0 ; i < 512 ; i += 2) { //save 256 samples
while(!(ADCSRA & 0x10)); //wait for adc to be ready
ADCSRA = 0xf5; //restart adc
byte m = ADCL; //fetch adc data
byte j = ADCH;
int k = (j << 8) | m; //form into an int
k -= 0x0200; //form into a signed int
k <<= 6; //form into a 16b signed int
fft_input[i] = k; //put real data into even bins
}
fft_window(); // window the data for better frequency response
fft_reorder(); // reorder the data before doing the fft
fft_run(); // process the data in the fft
fft_mag_lin(); // take the output of the fft
sei();
fft_lin_out[0] = 0;
fft_lin_out[1] = 0;
for(unsigned char i = 0; i < 11; i++){
unsigned char maxW = 0;
for(unsigned char x = grenzen[i]; x < grenzen[i+1];x++){
if((unsigned char)fft_lin_out[x] > maxW){
maxW = (unsigned char)fft_lin_out[x];
}
}
setBalken(i, maxW);
Serial.print(maxW);
Serial.print(" ");
}
Serial.println("");
TIMSK0 = 1;
FastLED.show();
TIMSK0 = 0;
}
}
