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Editorial Team
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Asked: 2026-06-09T11:28:31+00:00

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

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  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);

Serial.println(ph->valuefloat); returns 0.00. I have never dealt with C structs before and not sure if I setup the syntax correctly. My json structure seems fairly straight forward; however, I am not sure if I am accessing the correct creatObject() for the ph float value. What should I do to get the proper value of ph?

For further information about the aJSON library, please visit: http://interactive-matter.eu/blog/2010/08/14/ajson-handle-json-with-arduino/

EDIT new code:

  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);

I ended up changing the json structure to more of a simpler structure. I felt there wasn’t a need for a another substructure due to the ram shortage of the arduino. After shortening the json structure I was able to successfully get the valuefloat of ph. I am still interested in figuring out the prior issue for future reference.

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1 Answer

  1. Editorial Team

    I just tried your code and found that you have declared both sBoard and sensorType twice at the beginning of the snippet.

    I removed it and I am getting the proper response “5.33”. This is the code that I am using after editing.

      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);
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