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[求助] 怎么用按键控制WS2812灯带

灯带的功能目前都正常，但是想用一个按钮按下灯带亮工作一次，然后熄灭。
现在用while和if都试过了，按钮总是无效的。后面用红字注释的位置。

#include <FastLED.h>
#define WS_NUM_LEDS 47
//D1到D5分别5组LED
#define WS_DATA_PIN1 D1
#define WS_DATA_PIN2 D2
#define WS_DATA_PIN3 D3
#define WS_DATA_PIN4 D4
#define WS_DATA_PIN5 D5
#define WS_COLOR GRB
int duration = 20;
CRGB ws_leds[WS_NUM_LEDS];
void selectLED(int pin) {
for(int i=0;i<WS_NUM_LEDS;i++){
FastLED.delay(duration<50 ? duration=duration+20 : duration);
ws_leds = CRGB::Red;
//ws_leds = rgb[step];
ws_leds[WS_NUM_LEDS-1-i] =CRGB::Blue;
//ws_leds[WS_NUM_LEDS-1-i] = rgb[step];
  }
  FastLED.show();
  delay(100);
  FastLED.clear();
// 选择5个不重复的随机LED让它们长亮
  int selectedLeds[5];
  for (int i = 0; i < 5; i++) {
int index;
bool duplicate;
do {
   index = random(0,35);
   duplicate = false;
   for (int j = 0; j < i; j++) {
      if (selectedLeds[j] == index) {
      duplicate = true;
      break;
                                    }
                              }
   } while (duplicate);
selectedLeds = index;
ws_leds[index] = CRGB::Blue;
                     }
// 选择2个不重复的随机LED让它们长亮
  int SelectedLeds[2];
randomSeed(analogRead(0));
  for (int x = 0; x < 2; x++) {
int index;
bool duplicate;
do {
   index = random(35,47);
   duplicate = false;
   for (int y = 0; y < x; y++) {
      if (SelectedLeds[y] == index) {
      duplicate = true;
      break;
      }
   }
} while (duplicate);
SelectedLeds[x] = index;
ws_leds[index] = CRGB::Red;
                           }
  FastLED.show();

  delay(3000);
  fill_solid(ws_leds, WS_NUM_LEDS, CRGB::Black);
  FastLED.show();
  delay(1000);
}
void setup() {
FastLED.setBrightness(10);
randomSeed(analogRead(A0));
pinMode(D7,INPUT_PULLUP);          //D7设为上拉输入模式
}
int Val = digitalRead(D7);  //将开关状态数值读取到变量中
void loop() {
while(Val == HIGH) {                          //现在是while(Val == HIGH) 灯带循环，while（Val==LOW）灯带就一直不亮，按键也没用
//设置芯片型号，和信号引脚，以及RGB灯珠的顺序（GRB 表示绿红蓝）
  FastLED.addLeds<WS2812B, WS_DATA_PIN1, WS_COLOR>(ws_leds, WS_NUM_LEDS);
  selectLED(D1);
  FastLED.addLeds<WS2812B, WS_DATA_PIN2, WS_COLOR>(ws_leds, WS_NUM_LEDS);
  selectLED(D2);
  FastLED.addLeds<WS2812B, WS_DATA_PIN3, WS_COLOR>(ws_leds, WS_NUM_LEDS);
  selectLED(D3);
  FastLED.addLeds<WS2812B, WS_DATA_PIN4, WS_COLOR>(ws_leds, WS_NUM_LEDS);
  selectLED(D4);
  FastLED.addLeds<WS2812B, WS_DATA_PIN5, WS_COLOR>(ws_leds, WS_NUM_LEDS);
  selectLED(D5);
               }
}