#include <LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
const int buttonPin = 8;
unsigned long previousMillis = 0;
const long interval = 2000;

void setup() {
  lcd.begin(16, 2);
  pinMode(buttonPin, INPUT_PULLUP);
  lcd.clear();
}

void loop() {
  if (digitalRead(buttonPin) == LOW) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Mensagem Enviada");
    previousMillis = millis();
  }
  
  unsigned long currentMillis = millis();
  
  if (currentMillis - previousMillis >= interval) {
    lcd.clear();
  }
}