Arduino土壤湿度传感器

/*南京市金陵中学高一年级选修课
 测试功能：土壤湿度传感器实验
 */
#define waterPump 9
void setup(){
 pinMode(waterPump,OUTPUT);
}
void loop(){
int humidtyRaw = analogRead(A0);
 int humidtyReal = map(humidtyRaw,1023,0,0,100);
if(humidtyReal > 30)
  {
     digitalWrite(waterPump,HIGH);
   }else{
     digitalWrite(waterPump,LOW);
   }
}

电路连接