bool mode = false;
//bool and int are both values 
//bool只有0 false或1 true两个值
//节省算力
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);//设置串行数据传输的数据速率
  pinMode(2, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(3, OUTPUT);
  digitalWrite(3, LOW);

}

void loop() {

  while (mode == false) {
    if (digitalRead(5) == LOW) {
      delay(500);
      mode = !mode ; //反转值
      delay(500);
      Serial.println(mode);
    }
  }
  
  if (digitalRead(2) == LOW) {
    digitalWrite(3, HIGH);
    delay(500);
    digitalWrite(3, LOW);
    delay(500);
    //mode1时闪一下
  }
  
  while (mode == true) {
    if (digitalRead(5) == LOW) {
      delay(500);
      mode = !mode ;
      delay(500);
      Serial.println(mode);
    }
    
    if (digitalRead(2) == LOW) {
      digitalWrite(3, HIGH);
      delay(500);
      digitalWrite(3, LOW);
      delay(500);

      digitalWrite(3, HIGH);
      delay(500);
      digitalWrite(3, LOW);
      delay(500);
      //mode2时闪两下
    }
  }
}