LCD 没有按键输入自动熄屏幕 【调式】

#include <Bounce2.h>

Bounce btn =Bounce(2,50);
int led =13;
int ledstate=LOW;
long previousMillis = 0;
long interval = 1000;   
int lcd=HIGH;

void setup() {
pinMode(2,INPUT);
pinMode(led,OUTPUT);

}

void loop() {
   unsigned long currentMillis = millis();

   if(lcd==LOW);
   {
    if(currentMillis - previousMillis > interval)
    {
     previousMillis = currentMillis;
   ledstate=LOW;
 
    digitalWrite(led,ledstate);
    lcd=HIGH;
   }
   }
  if(btn.update()==true && btn.read()==HIGH)
  {
  lcd=LOW;
    if(ledstate==LOW)
    {
      ledstate=HIGH;
     
    }
    else
    {
      ledstate=LOW;
    }
   
    digitalWrite(led,ledstate);
  }

 
}