#include <MSGEQ7.h>

#include <Adafruit_NeoPixel.h>

#define MIN_K_value 100

#define MAX_K_value 200

int K_value = 100;

MSGEQ7 eq;

Adafruit_NeoPixel pixels = Adafruit_NeoPixel(130, 6, NEO_GRB + NEO_KHZ800);

uint32_t color_map[130] =

{ //위치별 픽셀 색상설정. 마음에 드는 색조합을 맞추어보세요!

  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,

  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,

  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,

  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,

  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,

  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,
  
  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,
  
  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,
  
  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,
  
  0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,0x00efef00,0x00efef00,0x00efef00,0x00efef00,0x005050af,

}

;

void setup() {

  eq.init();//스펙트럼 쉴드를 사용하기 시작합니다.

  pixels.begin();//네오픽셀을 사용하기 시작합니다.

  pixels.clear();//네오픽셀을 사용하기 시작합니다.

}

int cnt = 0;

void loop() {

  eq.poll();//오디오 정보를 갱신합니다.

  int max_v = 0;

  pixels.clear();

  for(int i = 0;i < 7;i++){//입력받은 신호에 따라 네오픽셀을 제어합니다.

    int l = eq.getLValue(i);

    int r = eq.getRValue(i);

    int v = (l<r? r:l);

    max_v = (v>max_v? v:max_v);

    for(int j = 0;j < 5;j++){

      if(v > K_value*(5-j)){

        on_pixel(i+(8*j));

      }

    }

  }

  for(int j = 0;j < 5;j++){//최대음량을 마지막 줄에 표시합니다.

    if(max_v > K_value*(5-j)){

      on_pixel(7+(8*j));

    }

  }

  K_value = constrain(max_v/5,MIN_K_value,MAX_K_value);//5등분 분할의 기준을 음악의 최대값의 크기에 맞게 조절합니다.

  pixels.show();

  delay(100);

}

void on_pixel(int index){

   pixels.setPixelColor(index, color_map[index]);//각위치에 맞는 색상을 선택합니다.

}

제가 이 코드로 네오픽셀과 스펙트럼 쉴드를 이용한 이퀄라이저를 만들어보려고 하는데요, 계속 컴파일 오류가 납니다.

오류메세지는 아래와 같습니다.

아두이노:1.8.5 (Windows 10), 보드:"Arduino/Genuino Uno"

sketch_dec09a:11: error: 'MSGEQ7' does not name a type

 MSGEQ7 eq;

 ^

C:\Users\handongwoo\Documents\Arduino\sketch_dec09a\sketch_dec09a.ino: In function 'void setup()':

sketch_dec09a:45: error: 'eq' was not declared in this scope

   eq.init();//?뒪?럺?듃?읆 ?돱?뱶瑜? ?궗?슜?븯湲? ?떆?옉?빀?땲?떎.

   ^

C:\Users\handongwoo\Documents\Arduino\sketch_dec09a\sketch_dec09a.ino: In function 'void loop()':

sketch_dec09a:57: error: 'eq' was not declared in this scope

   eq.poll();//?삤?뵒?삤 ?젙蹂대?? 媛깆떊?빀?땲?떎.

   ^

exit status 1
'MSGEQ7' does not name a type

왜 이러한 오류가 나는지 알고싶습니다.

감사합니다.