我的超声波距离传感器的数值一直为零int R=13;int B=12;int G=11;int zongkaiguan=10;int valzong;int juli;int T=A0;//触发int E=A1;//回响int buzzer=9;void loop(){ valzong=digitalRead(zongkaiguan); Serial.print("zongkaiguan: "); if(valzong>0) { Serial.println("ON"); analogWrite(R,0); analogWrite(B,0); analogWrite(G,255); digitalWrite(T,LOW); delayMicroseconds(10); digitalWrite(T,HIGH); delayMicroseconds(10); digitalWrite(T,LOW); juli=pulseIn(E,HIGH)/58.0; Serial.print("juli= "); Serial.print(juli); Serial.println(" cm"); delay(10); if (juli<=15) { analogWrite(R,250); analogWrite(B,10); analogWrite(G,128);//在工作状态下，橙色灯亮 delay(2000); } else { for(int i=0;i<255;i++) {analogWrite(buzzer,i); delay(2); } for(int i=255;i>0;i--) {analogWrite(buzzer,i); delay(1); } } }