Arduino read JSON data - arduino

Question

Can you help me to solve a problem? I'm using an Arduino. How can I read and split JSON data in Arduino? The value is {$sen1:$sen2}.

Answer 1

Example
How to deserialize a JSON document with ArduinoJson.
Source code
// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2017
// MIT License
#include <ArduinoJson.h>
void setup() {
// Initialize serial port
Serial.begin(9600);
while (!Serial) continue;
// Memory pool for JSON object tree.
//
// Inside the brackets, 200 is the size of the pool in bytes.
// Don't forget to change this value to match your JSON document.
// Use arduinojson.org/assistant to compute the capacity.
StaticJsonBuffer<200> jsonBuffer;
// StaticJsonBuffer allocates memory on the stack, it can be
// replaced by DynamicJsonBuffer which allocates in the heap.
//
// DynamicJsonBuffer jsonBuffer(200);
// JSON input string.
//
// It's better to use a char[] as shown here.
// If you use a const char* or a String, ArduinoJson will
// have to make a copy of the input in the JsonBuffer.
char json[] =
"{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
// Root of the object tree.
//
// It's a reference to the JsonObject, the actual bytes are inside the
// JsonBuffer with all the other nodes of the object tree.
// Memory is freed when jsonBuffer goes out of scope.
JsonObject& root = jsonBuffer.parseObject(json);
// Test if parsing succeeds.
if (!root.success()) {
Serial.println("parseObject() failed");
return;
}
// Fetch values.
//
// Most of the time, you can rely on the implicit casts.
// In other case, you can do root["time"].as<long>();
const char* sensor = root["sensor"];
long time = root["time"];
double latitude = root["data"][0];
double longitude = root["data"][1];
// Print values.
Serial.println(sensor);
Serial.println(time);
Serial.println(latitude, 6);
Serial.println(longitude, 6);
}
void loop() {
// not used in this example
}