HVAC Temperature And Status Monitoring With Arduino

#include <SoftwareSerial.h>
    #define DEBUG true
    SoftwareSerial esp8266(2,3); 
       
       const int buttonPin = 4; 
       const int buttonPin1 = 5;
       const int buttonPin2 = 6;
       const int buttonPin3 = 7;
       const int buttonPin4 = 8;
       const int buttonPin5 = 9;
       int b1,b2,b3,b4,b5,b6 = 0,aa=0,bb=0; 
       float vout;int sens;  
                              
    void setup()
    {
      Serial.begin(9600);
      esp8266.begin(115200); // your esp's baud rate might be different
    
        pinMode(buttonPin, INPUT);
        pinMode(buttonPin1, INPUT);
        pinMode(buttonPin2, INPUT);
        pinMode(buttonPin3, INPUT);
        pinMode(buttonPin4, INPUT);
        pinMode(buttonPin5, INPUT);         
        
        sendData("AT+RST\r\n",2000,DEBUG); // reset module
        delay(1000);
        sendData("AT+CWMODE=1\r\n",1000,DEBUG); // configure as access point
        delay(1000);