Sound-controlled Neopixel LED Lights

1#include <FastLED.h>
2#define NUM_LEDS 60
3#define DATA_PIN 6
4#define  AVG_NOISE_LVL 970
5#define MAX_NOISE_LVL 1023
6
7CRGB leds[NUM_LEDS];
8
9int  numLedsToLight = 0;
10
11void setup() { 
12  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds,  NUM_LEDS);
13  FastLED.clear();
14}
15
16void loop() {
17  int val = analogRead(A0);
18  numLedsToLight = map(val, MAX_NOISE_LVL-AVG_NOISE_LVL, 0, 0, NUM_LEDS);
19  int  brightness = map(val, MAX_NOISE_LVL-AVG_NOISE_LVL, 0, 0, 255);
20
21  for(int  led = numLedsToLight; led >= 0; led--) { 
22    rainbow_wave(10, 10);
23  }
24  delay(10);
25  FastLED.setBrightness(brightness);
26  FastLED.show();
27  //  First, clear the existing led values
28  FastLED.clear(false);
29}
30
31void  rainbow_wave(uint8_t thisSpeed, uint8_t deltaHue) {     // The fill_rainbow call  doesn't support brightness levels.
32 
33// uint8_t thisHue = beatsin8(thisSpeed,0,255);                // A simple rainbow wave.
34  uint8_t thisHue = beat8(thisSpeed,255);                     // A simple rainbow march.
35    
36  fill_rainbow(leds,  numLedsToLight, thisHue, deltaHue);            // Use FastLED's fill_rainbow routine.
37  
38}