Logic_error

const int up_bot = 6; //Botão UP (CIMA)
const int down_bot = 5; //Botão DOWN (BAIXO)

int select = 1;

void setup() {
  Serial.begin(9600);

  pinMode(up_bot,INPUT);
  pinMode(down_bot,INPUT);

}

void loop(){

  menu();

}

void menu(){

  Serial.println("MENU");
  delay(5000);

  do{
    if(digitalRead(up_bot) == LOW){
      select++;
      if(select > 3){
        select = 1;
      }
    }
    if(digitalRead(down_bot) == LOW){
      select--;
      if(select < 1){
        select = 3;
      }
    }

    switch (select){
      case 1:
        Serial.println("MAX temp");

      break;

      case 2:
        Serial.println("MIN temp");

      break;

      case 3:
        Serial.println("Caso 3");

      break;

      default:
        Serial.println("Error");

      break;

    }

    Serial.println(select);
    delay(1000);
  }while(1>0);

}