int ruxin = 2778;
String yisen = "I love RuXin";
int delay5 = 5000; //delay多久？
unsigned long int timeout = 0; //默认0

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(13, OUTPUT);
  pinMode(11, INPUT_PULLUP);
  pinMode(A0, INPUT);
  pinMode(3, OUTPUT);
  pinMode(5, OUTPUT);
  //pinMode(8, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:if
  //Serial.println(String(ruxin) + yisen); //打印结婚誓言
  delayex();
  led();
  tianxue();
}

void tianxue() {
  int yixing = analogRead(A0);
  int liangdu = map(yixing, 0, 1023, 0, 255);
  analogWrite(5, liangdu);
}

void delayex() {
  if (millis() - timeout >= delay5 || timeout == 0) {
    digitalWrite(13, HIGH);
    digitalWrite(3, HIGH);
    Serial.println(analogRead(A0));
    timeout = millis();
  }
}

void led() {
  digitalWrite(13 , LOW);
  digitalWrite(3, LOW);
  if (digitalRead(11) == 0) {
    digitalWrite(13, HIGH);
     //Serial.println("rus");
  }
}