#define led  33
#define button 5
volatile bool flag = false;
void handle_interrupt(){
  flag = true;
}
void setup() { 
  pinMode(led, OUTPUT);
  pinMode(button, INPUT_PULLDOWN);
  digitalWrite(led, HIGH);
  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(button),handle_interrupt,RISING);
}

void loop() {
  if(flag){
    digitalWrite(led,!digitalRead(led));
    Serial.println("外部中断触发"); 
    delay(1000);
  }
  flag = false;
}