[209] | 1 | // Copyright Benoit Blanchon 2014-2016
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| 2 | // MIT License
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| 3 | //
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| 4 | // Arduino JSON library
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| 5 | // https://github.com/bblanchon/ArduinoJson
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| 6 | // If you like this project, please add a star!
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| 7 |
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| 8 | #include <ArduinoJson.h>
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| 9 |
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| 10 | void setup() {
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| 11 | Serial.begin(9600);
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| 12 | while (!Serial) {
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| 13 | // wait serial port initialization
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| 14 | }
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| 15 |
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| 16 | // Memory pool for JSON object tree.
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| 17 | //
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| 18 | // Inside the brackets, 200 is the size of the pool in bytes.
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| 19 | // If the JSON object is more complex, you need to increase that value.
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| 20 | StaticJsonBuffer<200> jsonBuffer;
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| 21 |
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| 22 | // StaticJsonBuffer allocates memory on the stack, it can be
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| 23 | // replaced by DynamicJsonBuffer which allocates in the heap.
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| 24 | // It's simpler but less efficient.
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| 25 | //
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| 26 | // DynamicJsonBuffer jsonBuffer;
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| 27 |
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| 28 | // Create the root of the object tree.
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| 29 | //
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| 30 | // It's a reference to the JsonObject, the actual bytes are inside the
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| 31 | // JsonBuffer with all the other nodes of the object tree.
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| 32 | // Memory is freed when jsonBuffer goes out of scope.
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| 33 | JsonObject& root = jsonBuffer.createObject();
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| 34 |
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| 35 | // Add values in the object
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| 36 | //
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| 37 | // Most of the time, you can rely on the implicit casts.
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| 38 | // In other case, you can do root.set<long>("time", 1351824120);
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| 39 | root["sensor"] = "gps";
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| 40 | root["time"] = 1351824120;
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| 41 |
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| 42 | // Add a nested array.
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| 43 | //
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| 44 | // It's also possible to create the array separately and add it to the
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| 45 | // JsonObject but it's less efficient.
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| 46 | JsonArray& data = root.createNestedArray("data");
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| 47 | data.add(double_with_n_digits(48.756080, 6));
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| 48 | data.add(double_with_n_digits(2.302038, 6));
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| 49 |
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| 50 | root.printTo(Serial);
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| 51 | // This prints:
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| 52 | // {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}
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| 53 |
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| 54 | Serial.println();
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| 55 |
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| 56 | root.prettyPrintTo(Serial);
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| 57 | // This prints:
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| 58 | // {
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| 59 | // "sensor": "gps",
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| 60 | // "time": 1351824120,
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| 61 | // "data": [
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| 62 | // 48.756080,
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| 63 | // 2.302038
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| 64 | // ]
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| 65 | // }
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| 66 | }
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| 67 |
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| 68 | void loop() {
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| 69 | // not used in this example
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| 70 | }
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