答案:int PIR = 2;Int RELAY = 3;Void setup() {Serial.begin(9600);PinMode(PIR,INPUT);PinMode(RELAY,OUTPUT);}Void loop() {While(!digitalRead(PIR)){}Serial.println("turn on");DigitalWrite(RELAY,HIGH);Delay(10000);DigitalWrite(RELAY,LOW);Serial.println("turn off");}