05 ¹âÃôµç×è¿ØÖÆLEDÁÁÃð

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);  //ͨ¹ý¼ì²â¹âÃôµç×èµÄÊýÖµ，ãÐÖµ100±È½ÏºÏÊÊ
  Serial.println(lightValue);
  delay(100);
  if(lightValue<100){
    digitalWrite(ledPin,HIGH);
  }else{
    digitalWrite(ledPin,LOW);
  }
}