Rechargeable Digital Foosball Scoreboard Using ESP8266

#include <Arduino.h>
#include <TM1637Display.h>

// Module connection pins (Digital Pins)
#define CLK D6
#define DIO D5

#define REDSENSORPIN D3
#define BLUESENSORPIN D7

#define PUSHBUTTON 15 //D8  GPIO 15
#define BUZZPIN D2

// variables will change:
int redSensorState = 0, redLastState=0, blueSensorState = 0, blueLastState=0;         // variable for reading the pushbutton status
int redScore=0, blueScore=0;
int resetButttonPressed = 0;

String scoreCard="0000";



TM1637Display display(CLK, DIO);
uint8_t data[] =  { 0x0f, 0x0f, 0x0f, 0x0f };


void setup() {
  // initialize RED IR BEAM
  pinMode(REDSENSORPIN, INPUT_PULLUP);     
  digitalWrite(REDSENSORPIN, HIGH); // turn on the pullup

  // initialize BLUE IR BEAM
  pinMode(BLUESENSORPIN, INPUT_PULLUP);     
  digitalWrite(BLUESENSORPIN, HIGH); // turn on the pullup

  display.setBrightness(0x0f);
  //display.showNumberDecEx(105, 0b01000000, true, 4, 0);
  updateScore();
  
  
  pinMode(PUSHBUTTON,INPUT);
  pinMode(BUZZPIN,OUTPUT);
  
  Serial.begin(9600);
  Serial.println("Initialized....");
  
  
}



void loop(){
  // check status of RED IR BEAM
  redSensorState = digitalRead(REDSENSORPIN);

  //Serial.println(sensorState);
  
  if (redSensorState && !redLastState) {
    Serial.println("RED Unbroken");
    
  } 
  if (!redSensorState && redLastState) {
    Serial.println("RED Broken");
    redScore = redScore+1;
    updateScore();
    
  }
  
  redLastState = redSensorState;

  //check status of BLUE IR BEAM
  blueSensorState = digitalRead(BLUESENSORPIN);

  //Serial.println(sensorState);
  
  if (blueSensorState && !blueLastState) {
    Serial.println("BLUE Unbroken");
    
  } 
  if (!blueSensorState && blueLastState) {
    Serial.println("BLUE Broken");
    blueScore = blueScore+1;
    updateScore();
    
  }
  
  blueLastState = blueSensorState;

  //check for reset button pressed
  resetButttonPressed = digitalRead(PUSHBUTTON);
  //Serial.println(resetButttonPressed);
  
  if(resetButttonPressed == HIGH){
    //reset button is pressed
    resetScore();
  }
  
}

void resetScore(){
  Serial.println("Reset button pressed...");
  redScore=0; 
  blueScore=0;
  updateScore();
  delay(2000);
}

void updateScore(){
  
  Serial.println("update score");
  digitalWrite(BUZZPIN,HIGH);
  delay(1000);
  digitalWrite(BUZZPIN,LOW);
  scoreCard = String(redScore/10) + String(redScore%10) + String(blueScore/10) + String(blueScore%10);
  display.showNumberDecEx(scoreCard.toInt(), 0b01000000, true, 4, 0);
  
}