Educational Speech timer

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DFRobot_PAJ7620U2.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

DFRobot_PAJ7620U2 gestureSensor;

int ledPins[] = {27, 26, 14, 12, 25, 13};
int numLeds = sizeof(ledPins) / sizeof(int);
int currentLed = 0;
int currentRound = 0;
unsigned long lastBlinkTime = 0;
bool isRunning = false;
DFRobot_PAJ7620U2 paj;

void setup() {
  Serial.begin(115200);
  Serial.println("Gesture recognition system base on PAJ7620U2");
  while(paj.begin() != 0){
    Serial.println("initial PAJ7620U2 failure! Please check if all the connections are fine, or if the wire sequence is correct?");
    delay(10);
  }
  Serial.println("PAJ7620U2init completed, start to test the gesture recognition function");

  paj.setGestureHighRate(true);

if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.clearDisplay();
  display.setTextSize(4);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Ready");
  display.display();
  for(int i=0; i<numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], HIGH);
  }
  lastBlinkTime = millis();
}

void loop() {
  DFRobot_PAJ7620U2::eGesture_t gesture = paj.getGesture();
    if (gesture != paj.eGestureNone ){
   /* Get the string descritpion corresponding to the gesture number.
    * The string description could be 
    * "None","Right","Left", "Up", "Down", "Forward", "Backward", "Clockwise", "Anti-Clockwise", "Wave",
    * "WaveSlowlyDisorder", "WaveSlowlyLeftRight", "WaveSlowlyUpDown", "WaveSlowlyForwardBackward"
    */
    String description  = paj.gestureDescription(gesture);//Convert gesture number into string description
    Serial.println("--------------Gesture Recognition System---------------------------");
    Serial.print("gesture code        = ");Serial.println(gesture);
    Serial.print("gesture description  = ");Serial.println(description);
    Serial.println();

  display.clearDisplay();
  display.setTextSize(7);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Go");  
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextSize(9);
  display.setTextColor(WHITE);
  display.setCursor(50,0);
  display.println("0");  
  display.display();

    isRunning = true;
  }
  if(isRunning) {
    if(millis() - lastBlinkTime > 2000) {
    lastBlinkTime = millis();
    digitalWrite(ledPins[currentLed], LOW);
    currentLed++;
    if(currentLed >= numLeds) {
      currentLed = 0;
      currentRound++;
      for(int i=0; i<numLeds; i++) {
        digitalWrite(ledPins[i], HIGH);
      }
      display.clearDisplay();
      display.setCursor(45,0);
       display.setTextSize(8);
      display.println(currentRound);
      display.display();
        display.clearDisplay();
    }
  }
}
}