WiFi ESP8226 D1 LED Painting

/*
    This sketch demonstrates how to scan WiFi networks and light up a strip of LEDs
*/
#define FASTLED_ESP8266_D1_PIN_ORDER
#include "ESP8266WiFi.h"
#include "FastLED.h"
String ssid_look = "Nhat Binh";
//String ssid_look = "DANANG WIFI";
String look;
//Define vartiables for LED calculations
long value;
long rssi;
long numLedsToLight;
// FastLED definitions
#define NUM_LEDS 99
#define DATA_PIN 4
// Define the array of leds
CRGB leds[NUM_LEDS];
void setup() {
  Serial.begin(115200);
  //Set the strip up
  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
   FastLED.setBrightness(100);
  FastLED.clear();
  // Set WiFi to station mode and disconnect from an AP if it was previously connected
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);
  Serial.println("Setup done");
}

void loop() {
  Serial.println("scan start");

  // WiFi.scanNetworks will return the number of networks found
  int n = WiFi.scanNetworks();
  Serial.println("scan done");
  if (n == 0) {
    Serial.println("no networks found");
    //Fill all red if no wifi found
    // First, clear the existing led values
    FastLED.clear();
    fill_solid( leds, NUM_LEDS, CRGB::White);

  } else {
    Serial.print(n);
    Serial.println(" networks found");
    for (int i = 0; i < n; ++i) {
      // Print SSID and RSSI for each network found
      Serial.printf("%d: %s, Ch:%d (%ddBm) %s\n", i + 1, WiFi.SSID(i).c_str(), WiFi.channel(i), WiFi.RSSI(i), WiFi.encryptionType(i) == ENC_TYPE_NONE ? "open" : "");
      look = WiFi.SSID(i);
      if (look == ssid_look) {
        //Put the signal strength of the SSID looked for in rssi
        rssi = WiFi.RSSI(i);
        Serial.print("Wifi scanned SSID iss...");
        Serial.println(look);
        break;
      }
    }
  }
  //Serial.println("Here");
  //Do all the light stuff where green is the strength and red fills the rest of the LEDS
  if (look == ssid_look) {
    // Calculate the number of Grren LEDs to light up
    int   value = 2 * (rssi + 100);
    int numLedsToLight = map(value, 0, 100, 0, NUM_LEDS);
    //Serial.println(numLedsToLight);
    // First, clear the existing led values
    FastLED.clear();
    //Turn on the scnnned channel value as Green LEDs
    for (int led = 0; led < numLedsToLight; led++) {
      //Serial.println(numLedsToLight);
      leds[led] = CRGB::Green;
      //Serial.print(led);
    }
    // Turn on the remaining LEDs as Red
    for (int led = numLedsToLight; led < NUM_LEDS; led++) {
      leds[led] = CRGB::Red;
    }
    Serial.print(numLedsToLight);
    Serial.println(" LEDS will be shown");
  } else {
    Serial.print("No SSID match");
    Serial.println("");
    fill_solid( leds, NUM_LEDS, CRGB::White);
  }

  FastLED.show();
  // Wait a bit before scanning again
  delay(500);
  //Delete all the WIFI scanned info
  WiFi.scanDelete();
  numLedsToLight = 0;
  Serial.println("--Clear values--");
}