int led1=13;
int led2=12;
int led3=4;
int led4=2;
int pot1=A0;
int pot2=A1;
void setup(){
  Serial.begin(115200);
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(pot1, INPUT);
  pinMode(pot2, INPUT);
}

void loop(){
  int val_pot1 = analogRead(pot1);
  int val_pot2 = analogRead(pot2);
  Serial.print("pot1 ="); 
  Serial.print(val_pot1);
  Serial.print("\t");
  Serial.print("pot2 =");
  Serial.println(val_pot2);
  delay(1000);
  if(val_pot1 < val_pot2 ){
  digitalWrite(led1,LOW);
  digitalWrite(led2,LOW);
  digitalWrite(led3,LOW);
  digitalWrite(led4,LOW);
  delay(500);
  }
  if(val_pot1>val_pot2);{
  digitalWrite(led1,HIGH);
  digitalWrite(led2,HIGH);
  digitalWrite(led3,HIGH);
  digitalWrite(led4,HIGH);
  delay(500);
  }
}