Audio Spectrum Analyzer Arduino + Lcd 2X16

Audio Spectrum Analyzer Arduino + LCD 2x16 - Jika sebelumnya artikel yang aku bahas perihal sensor suhu digital yang ditampilkan dengan memakai sebuah LCD 2x16, artikel kali ini juga aku masih bekerjasama dengan LCD 2x16 sebagai penampilnya, alat yang dibentuk adalah Audio Spectrum Analyzer yang berbasis mikrokontroller Aduino.

Audio Spectrum Analyzer berfungsi sebagai indikator frekuensi sinyal dari bunyi yang dapat di gunakan pada amplifier.

Artikel Tentang FFT http://www.arduinoos.com/2010/10/fast-fourier-transform-fft-cont/

Wiring Arduino :

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Untuk coding arduino silahkan copy code berikut ke software arduino

 /* FFT_TEST4   Ray Burnette 20130810 function clean-up & 1284 port (328 verified)   Uses 2x16 Parallel LCD in 4-bit mode, see LiquidCrystal lib call for details   http://forum.arduino.cc/index.php?PHPSESSID=4karr49jlndufvtlqs9pdd4g96&topic=38153.15   Modified by varind in 2013: this code is public domain, enjoy!   http://www.variableindustries.com/audio-spectrum-analyzer/   328P = Binary sketch size: 5,708 bytes (of a 32,256 byte maximum)   1284P= Binary sketch size: 5,792 bytes (of a 130,048 byte maximum) Free RAM = 15456   Binary sketch size: 8,088 bytes (of a 130,048 byte maximum) (Debug) */  #include <LiquidCrystal.h> #include <fix_fft.h>  #define DEBUG 0 #define L_IN 1 // Audio input A0 Arduino #define R_IN 0 // Audio input A1 Arduino  const int Yres = 8; const int gain = 3; float peaks[64]; char im[64], data[64]; char Rim[64], Rdata[64]; char data_avgs[64]; int debugLoop; int i; int load;  LiquidCrystal lcd(11, 10, 7, 6, 5, 4); // pins to LCD  // Custom CHARACTERS byte v1[8] = {   B00000, B00000, B00000, B00000, B00000, B00000, B00000, B11111 }; byte v2[8] = {   B00000, B00000, B00000, B00000, B00000, B00000, B00000, B11111 }; byte v3[8] = {   B00000, B00000, B00000, B00000, B00000, B11111, B11111, B11111 }; byte v4[8] = {   B00000, B00000, B00000, B00000, B11111, B11111, B11111, B11111 }; byte v5[8] = {   B00000, B00000, B00000, B11111, B11111, B11111, B11111, B11111 }; byte v6[8] = {   B00000, B00000, B11111, B11111, B11111, B11111, B11111, B11111 }; byte v7[8] = {   B00000, B11111, B11111, B11111, B11111, B11111, B11111, B11111 }; byte v8[8] = {   B11111, B11111, B11111, B11111, B11111, B11111, B11111, B11111 };  void setup() {    if (DEBUG) {     Serial.begin(9600); // hardware serial     Serial.print("Debug ON");     Serial.println("");   }    lcd.begin(16, 2);   lcd.clear();   lcd.createChar(1, v1);   lcd.createChar(2, v2);   lcd.createChar(3, v3);   lcd.createChar(4, v4);   lcd.createChar(5, v5);   lcd.createChar(6, v6);   lcd.createChar(7, v7);   lcd.createChar(8, v8);    for (i=0;i<80;i++)   {     for (load = 0; load < i / 5; load++)     {       lcd.setCursor(load, 1);       lcd.write(5);     }     if (load < 1)     {       lcd.setCursor(0, 1);       lcd.write(5);     }      lcd.setCursor(load + 1, 1);     lcd.write((i - i / 5 * 5) + 1);     for (load = load + 2; load < 16; load++)     {       lcd.setCursor(load, 1);       lcd.write(9);     }     lcd.setCursor(0, 0);     lcd.print("LOADING.........");     delay(50);   }   lcd.clear();   delay(500); }  void loop() {    for (int i = 0; i < 64; i++) {    // 64 bins = 32 bins of usable spectrum data     data[i]  = ((analogRead(L_IN) / 4 ) - 128);  // chose how to interpret the data from analog in     im[i]  = 0;   // imaginary component     Rdata[i] = ((analogRead(R_IN) / 4 ) - 128);  // chose how to interpret the data from analog in     Rim[i] = 0;   // imaginary component   }    fix_fft(data, im, 6, 0);   // Send Left channel normalized analog values through fft   fix_fft(Rdata, Rim, 6, 0); // Send Right channel normalized analog values through fft    // At this stage, we have two arrays of [0-31] frequency bins deep [32-63] duplicate    // calculate the absolute values of bins in the array - only want positive values   for (int i = 0; i < 32; i++) {     data[i] = sqrt(data[i]  *  data[i] +  im[i] *  im[i]);     Rdata[i] = sqrt(Rdata[i] * Rdata[i] + Rim[i] * Rim[i]);      // COPY the Right low-band (0-15) into the Left high-band (16-31) for display ease     if (i < 16) {       data_avgs[i] = data[i];     }     else {       data_avgs[i] = Rdata[i - 16];     }      // Remap values to physical display constraints... that is, 8 display custom character indexes + "_"     data_avgs[i] = constrain(data_avgs[i], 0, 9 - gain);     //data samples * range (0-9) = 9     data_avgs[i] = map(data_avgs[i], 0, 9 - gain, 0, Yres);  // remap averaged values   }    Two16_LCD();   decay(1); }  void Two16_LCD() {   lcd.setCursor(0, 0);   lcd.print("L"); // Channel ID replaces bin #0 due to hum & noise   lcd.setCursor(0, 1);   lcd.print("R"); // ditto    for (int x = 1; x < 16; x++) {  // init 0 to show lowest grup musik overloaded with hum     int y = x + 16; // second display line     if (data_avgs[x] > peaks[x]) peaks[x] = data_avgs[x];     if (data_avgs[y] > peaks[y]) peaks[y] = data_avgs[y];      lcd.setCursor(x, 0); // draw first (top) row Left     if (peaks[x] == 0) {       lcd.print("_");  // less LCD artifacts than " "     }     else {       lcd.write(peaks[x]);     }      lcd.setCursor(x, 1); // draw second (bottom) row Right     if (peaks[y] == 0) {       lcd.print("_");     }     else {       lcd.write(peaks[y]);     }   }    debugLoop++;   if (DEBUG && (debugLoop > 99)) {     Serial.print( "Free RAM = " );     Serial.println( freeRam(), DEC);     Serial.println( millis(), DEC);     debugLoop = 0;   } }   int freeRam () {   extern int __heap_start, *__brkval;   int v;   return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval); }   void decay(int decayrate) {   int DecayTest = 1;   // reduce the values of the last peaks by 1   if (DecayTest == decayrate) {     for (int x = 0; x < 32; x++) {       peaks[x] = peaks[x] - 1;  // subtract 1 from each column peaks       DecayTest = 0;     }   }    DecayTest++; }