I am currently working on making a Audio Spectrum Visualizer Analyzer using a MAX219 LED matrix. However I ran into a problem with my code on line 3. It said:
exit status 1
Compilation error: #include expects "FILENAME" or <FILENAME
Anyone know what I did wrong?
#include <arduinoFFT.h>
#include <MD_MAX72xx.h>
#include
<SPI.h>
#define SAMPLES 64 //Must be a power of 2
#define HARDWARE_TYPE
MD_MAX72XX::FC16_HW // Set display type so that MD_MAX72xx library treets it
properly
#define MAX_DEVICES 4 // Total number display modules
#define
CLK_PIN 13 // Clock pin to communicate with display
#define DATA_PIN 11 //
Data pin to communicate with display
#define CS_PIN 10 // Control pin to
communicate with display
#define xres 32 // Total number of columns in
the display, must be <= SAMPLES/2
#define yres 8 // Total number of rows
in the display
int MY_ARRAY[]={0, 128, 192, 224, 240, 248, 252, 254,
255}; // default = standard pattern
int MY_MODE_1[]={0, 128, 192, 224, 240, 248,
252, 254, 255}; // standard pattern
int MY_MODE_2[]={0, 128, 64, 32, 16, 8, 4,
2, 1}; // only peak pattern
int MY_MODE_3[]={0, 128, 192, 160, 144, 136, 132,
130, 129}; // only peak + bottom point
int MY_MODE_4[]={0, 128, 192, 160, 208,
232, 244, 250, 253}; // one gap in the top , 3rd light onwards
int MY_MODE_5[]={0,
1, 3, 7, 15, 31, 63, 127, 255}; // standard pattern, mirrored vertically
double vReal[SAMPLES];
double vImag[SAMPLES];
char data_avgs[xres];
int
yvalue;
int displaycolumn , displayvalue;
int peaks[xres];
const int buttonPin
= 5; // the number of the pushbutton pin
int state = HIGH; //
the current reading from the input pin
int previousState = LOW; // the previous
reading from the input pin
int displaymode = 1;
unsigned long lastDebounceTime
= 0; // the last time the output pin was toggled
unsigned long debounceDelay
= 50; // the debounce time; increase if the output flickers
MD_MAX72XX
mx = MD_MAX72XX(HARDWARE_TYPE, CS_PIN, MAX_DEVICES); // display object
arduinoFFT
FFT = arduinoFFT(); // FFT object
void
setup() {
ADCSRA = 0b11100101; // set ADC to free running mode
and set pre-scalar to 32 (0xe5)
ADMUX = 0b00000000; // use pin A0 and
external voltage reference
pinMode(buttonPin, INPUT);
mx.begin();
// initialize display
delay(50); // wait to get reference
voltage stabilized
}
void loop() {
// ++ Sampling
for(int
i=0; i<SAMPLES; i++)
{
while(!(ADCSRA & 0x10)); // wait for
ADC to complete current conversion ie ADIF bit set
ADCSRA = 0b11110101
; // clear ADIF bit so that ADC can do next operation (0xf5)
int
value = ADC - 512 ; // Read from ADC and subtract DC offset caused
value
vReal[i]= value/8; // Copy to bins after compressing
vImag[i] = 0;
}
// -- Sampling
// ++ FFT
FFT.Windowing(vReal, SAMPLES, FFT_WIN_TYP_HAMMING, FFT_FORWARD);
FFT.Compute(vReal, vImag, SAMPLES, FFT_FORWARD);
FFT.ComplexToMagnitude(vReal,
vImag, SAMPLES);
// -- FFT
// ++ re-arrange FFT result
to match with no. of columns on display ( xres )
int step = (SAMPLES/2)/xres;
int c=0;
for(int i=0; i<(SAMPLES/2); i+=step)
{
data_avgs[c]
= 0;
for (int k=0 ; k< step ; k++) {
data_avgs[c] = data_avgs[c]
+ vReal[i+k];
}
data_avgs[c] = data_avgs[c]/step;
c++;
}
// -- re-arrange FFT result to match with no. of columns on display
( xres )
// ++ send to display according measured value
for(int i=0; i<xres; i++)
{
data_avgs[i] = constrain(data_avgs[i],0,80);
// set max & min values for buckets
data_avgs[i] = map(data_avgs[i],
0, 80, 0, yres); // remap averaged values to yres
yvalue=data_avgs[i];
peaks[i] = peaks[i]-1; // decay by one light
if (yvalue > peaks[i])
peaks[i] = yvalue ;
yvalue = peaks[i];
displayvalue=MY_ARRAY[yvalue];
displaycolumn=31-i;
mx.setColumn(displaycolumn, displayvalue); //
for left to right
}
// -- send to display according measured value
displayModeChange (); // check if button pressed to change
display mode
}
void displayModeChange() {
int reading = digitalRead(buttonPin);
if (reading == HIGH && previousState == LOW && millis() - lastDebounceTime > debounceDelay)
// works only when pressed
{
switch (displaymode) {
case
1: // move from mode 1 to 2
displaymode = 2;
for (int
i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_2[i];
}
break;
case 2: // move from mode 2 to 3
displaymode = 3;
for
(int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_3[i];
}
break;
case 3: // move from mode 3 to 4
displaymode = 4;
for
(int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_4[i];
}
break;
case 4: // move from mode 4 to 5
displaymode = 5;
for
(int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_5[i];
}
break;
case 5: // move from mode 5 to 1
displaymode = 1;
for (int i=0 ; i<=8 ; i++ ) {
MY_ARRAY[i]=MY_MODE_1[i];
}
break;
}
lastDebounceTime = millis();
}
previousState
= reading;
}