05 光敏电阻控制LED亮灭

int lightPin=A0; int ledPin=4; int lightValue=0; void setup() {   // put your setup code here, to run once:   pinMode(ledPin,OUTPUT);   Serial.begin(9600); }  void loop() {   // put your main code here, to run repeatedly:   lightValue=analogRead(lightPin);  //检测光敏电阻的值，阈值100更合适   Serial.println(lightValue);   delay(100);   if(lightValue<100){     digitalWrite(ledPin,HIGH);   }else{     digitalWrite(ledPin,LOW);   } }