arduino aJSON库valuefloat始终返回0.00

Serial.println（ph->valuefloat）返回0.00。我以前从未处理过C结构，也不确定语法设置是否正确。我的json结构似乎相当直截了当；但是，我不确定是否为ph浮点值访问了正确的creatObject（）。我应该怎么做才能得到合适的ph值

有关aJSON图书馆的更多信息，请访问：

编辑新代码：

  aJsonObject* sBoard = aJson.createObject();
  aJsonObject* sensorType = aJson.createObject();

  aJsonObject* sBoard = aJson.createObject();
  aJsonObject* sensorType = aJson.createObject();

  aJson.addItemToObject(sBoard, "name", aJson.createItem("SensorBoardOne"));
  aJson.addItemToObject(sBoard, "Sensor", sensorType);

  aJson.addNumberToObject(sensorType, "ph", 5.33);
  aJson.addNumberToObject(sensorType, "ec", 880);
  aJson.addNumberToObject(sensorType, "temp", 74.68);

  aJsonObject* ph = aJson.getObjectItem(sensorType, "ph");

  Serial.println(ph->valuefloat);

最后，我将json结构更改为更简单的结构。我觉得由于arduino的ram短缺，不需要另一个底座。在缩短json结构后，我成功地获得了ph的valuefloat。我仍然有兴趣找出之前的问题以供将来参考。
我刚刚尝试了您的代码，发现您在代码段的开头两次声明了sBoard和sensorType

我删除了它，我得到了正确的回答“5.33”。这是我编辑后使用的代码

  aJsonObject* sBoard = aJson.createObject();
  
  aJson.addItemToObject(sBoard, "name", aJson.createItem("SensorBoardOne"));
  
  aJson.addNumberToObject(sBoard, "ph", 5.33);
  aJson.addNumberToObject(sBoard, "ec", 880);
  aJson.addNumberToObject(sBoard, "temp", 74.68);
  
  aJsonObject* phValue = aJson.getObjectItem(sBoard, "ph");
  char* string = aJson.print(sBoard);
    if (string != NULL) {
      Serial.println(string); //prints out: {"name":"SensorBoardOne","ph":5.33000,"ec":880,"temp":74.68000}

    }

  Serial.println(phValue->valuefloat);

  aJsonObject* sBoard = aJson.createObject();
  aJsonObject* sensorType = aJson.createObject();

  aJson.addItemToObject(sBoard, "name", aJson.createItem("SensorBoardOne"));
  aJson.addItemToObject(sBoard, "Sensor", sensorType);

  aJson.addNumberToObject(sensorType, "ph", 5.33);
  aJson.addNumberToObject(sensorType, "ec", 880);
  aJson.addNumberToObject(sensorType, "temp", 74.68);

  aJsonObject* ph = aJson.getObjectItem(sensorType, "ph");

  Serial.println(ph->valuefloat);