按键开关led 带提示音

#include <Bounce2.h>
int led=3;
int state=LOW;
int buzzer=9;

Bounce btn = Bounce(2,50);

void setup()
{
pinMode(2,INPUT);
pinMode(9,OUTPUT); 
pinMode(3,OUTPUT);
}

void loop()
{
if(btn.update()==true && btn.read()==HIGH)
{
    tone(buzzer,1480,200);
    if(state==LOW)
    {
      state=HIGH;
    }
    else
    {
      state=LOW;
    }
    digitalWrite(led,state);
}

}