problem with Adafruit_NeoPixel.h

hi i’m using latest arduino ide and i’m trying to compile and check these codes

/*
LED VU meter for Arduino and Adafruit NeoPixel LEDs.

Hardware requirements:

  • Most Arduino or Arduino-compatible boards (ATmega 328P or better).
  • Adafruit Electret Microphone Amplifier (ID: 1063)
  • Adafruit Flora RGB Smart Pixels (ID: 1260)
    OR
  • Adafruit NeoPixel Digital LED strip (ID: 1138)
  • Optional: battery for portable use (else power through USB or adapter)
    Software requirements:
  • Adafruit NeoPixel library

Connections:

  • 3.3V to mic amp +
  • GND to mic amp -
  • Analog pin to microphone output (configurable below)
  • Digital pin to LED data input (configurable below)
    See notes in setup() regarding 5V vs. 3.3V boards - there may be an
    extra connection to make and one line of code to enable or disable.

Written by Adafruit Industries. Distributed under the BSD license.
This paragraph must be included in any redistribution.
*/

#include <Adafruit_NeoPixel.h>

#define N_PIXELS 30 // Number of pixels in strand
#define MIC_PIN A5 // Microphone is attached to this analog pin
#define LED_PIN 6 // NeoPixel LED strand is connected to this pin
#define DC_OFFSET 0 // DC offset in mic signal - if unusure, leave 0
#define NOISE 20 // Noise/hum/interference in mic signal
#define SAMPLES 40 // Length of buffer for dynamic level adjustment
#define TOP (N_PIXELS + 2) // Allow dot to go slightly off scale
#define PEAK_FALL 60 // Rate of peak falling dot

byte
peak = 0, // Used for falling dot
dotCount = 0, // Frame counter for delaying dot-falling speed
volCount = 0; // Frame counter for storing past volume data
int
vol[SAMPLES], // Collection of prior volume samples
lvl = 20, // Current “dampened” audio level
minLvlAvg = 0, // For dynamic adjustment of graph low & high
maxLvlAvg = 512;
Adafruit_NeoPixel
strip = Adafruit_NeoPixel(N_PIXELS, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {

// This is only needed on 5V Arduinos (Uno, Leonardo, etc.).
// Connect 3.3V to mic AND TO AREF ON ARDUINO and enable this
// line. Audio samples are ‘cleaner’ at 3.3V.
// COMMENT OUT THIS LINE FOR 3.3V ARDUINOS (FLORA, ETC.):
analogReference(EXTERNAL);

memset(vol, 0, sizeof(vol));
strip.begin();
}

void loop() {
uint8_t i;
uint16_t minLvl, maxLvl;
int n, height;

n = analogRead(MIC_PIN); // Raw reading from mic
n = abs(n - 512 - DC_OFFSET); // Center on zero
n = (n <= NOISE) ? 0 : (n - NOISE); // Remove noise/hum
lvl = ((lvl * 7) + n) >> 3; // “Dampened” reading (else looks twitchy)

// Calculate bar height based on dynamic min/max levels (fixed point):
height = TOP * (lvl - minLvlAvg) / (long)(maxLvlAvg - minLvlAvg);

if(height < 0L) height = 0; // Clip output
else if(height > TOP) height = TOP;
if(height > peak) peak = height; // Keep ‘peak’ dot at top

// Color pixels based on rainbow gradient
for(i=0; i<N_PIXELS; i++) {
if(i >= height) strip.setPixelColor(i, 0, 0, 0);
else strip.setPixelColor(i,Wheel(map(i,0,strip.numPixels()-1,30,150)));

}

// Draw peak dot
if(peak > 0 && peak <= N_PIXELS-1) strip.setPixelColor(peak,Wheel(map(peak,0,strip.numPixels()-1,30,150)));

strip.show(); // Update strip

// Every few frames, make the peak pixel drop by 1:

if(++dotCount >= PEAK_FALL) { //fall rate

if(peak > 0) peak–;
dotCount = 0;
}

vol[volCount] = n; // Save sample for dynamic leveling
if(++volCount >= SAMPLES) volCount = 0; // Advance/rollover sample counter

// Get volume range of prior frames
minLvl = maxLvl = vol[0];
for(i=1; i<SAMPLES; i++) {
if(vol < minLvl) minLvl = vol*;*
else if(vol > maxLvl) maxLvl = vol*;*
* }*
* // minLvl and maxLvl indicate the volume range over prior frames, used*
* // for vertically scaling the output graph (so it looks interesting*
* // regardless of volume level). If they’re too close together though*
* // (e.g. at very low volume levels) the graph becomes super coarse*
* // and ‘jumpy’…so keep some minimum distance between them (this*
* // also lets the graph go to zero when no sound is playing):*
* if((maxLvl - minLvl) < TOP) maxLvl = minLvl + TOP;*
_ minLvlAvg = (minLvlAvg * 63 + minLvl) >> 6; // Dampen min/max levels_
_ maxLvlAvg = (maxLvlAvg * 63 + maxLvl) >> 6; // (fake rolling average)
}
// Input a value 0 to 255 to get a color value.
// The colors are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
* if(WheelPos < 85) {
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
} else if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
} else {
WheelPos -= 170;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
}
}[/quote]
but i get this error_

> /Users/behrooz/Documents/Arduino/new/new.ino:1:31: fatal error: Adafruit_NeoPixel.h: No such file or directory*

> #include <Adafruit_NeoPixel.h>
> ^
> compilation terminated.
> exit status 1
> Error compiling for board Arduino/Genuino Uno.
keep in mind that i’m aware of installing library but any help will be useful! thanks in advance!

Please use code tags (</> button) rather than quote tags when you post code or error/warning messages.

pejman1998:
keep in mind that i’m aware of installing library but any help will be useful! thanks in advance!

Do you need instructions for how to install the library?

keep in mind that i'm aware of installing library

You are aware that you need to, but you need our permission? Permission granted.

If you mean something else, choose a selection of words that makes sense.