Questions tagged [json]

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48 views

How send method POST with JSON? Arduino UNO R3 + SIM900

Why is the server side of php not loading any data from arduino? What did I do wrong? String reading="{\"latitude\": 12.983027, \"longitude\": 80.2594}"; mySerial.println("AT+HTTPINIT"); ...
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0answers
32 views

Edit JSON File on SD Card

I am currently Working on a project, where I save values in a JSON File on an SD Card. The JSON looks something like this: { "ID1":{[[starttime, endtime], [starttime, endtime], [....
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1answer
35 views

How to get full response json SIM900 + Arduino?

void toSerial(int delay_ms) { delay(delay_ms); while(mySerial.available()) { Serial.write(mySerial.read()); } } Serial.begin(9600); mySerial.begin(9600); mySerial....
0
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1answer
63 views

Large number into variable

Probably something easy but I’ve not resolved it. I’m extracting data from a JSON string and all the values are correct accept for two. They are referring to two date time values and are in ...
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2answers
84 views

WiFi.begin doesn't work with ArduinoJson's const char* output

I'm using ArduinoJson to parse a file full of JSON strings that contain the SSID and password for the registered networks. I have a little web interface that runs in soft AP mode so you can scan for ...
1
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1answer
140 views

Serialize JSON as response to HTTP request

I'd like my ESP8266 to provide some JSON endpoints. I want to use ArduinoJson for serialisation. While this works in general if I serialize into a String and return this String afterwards, I was ...
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0answers
53 views

Error sending data too large for ESP8266

The code below I use it to send data to a server. However, if you add one more node to json postRequest, the serial will stop showing data and it will not be sent to the server. However, if I remove a ...
0
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1answer
128 views

json format in esp32 with arduino json

I am using an ESP32 module for bluetooth connection and scaning wifi network. But I cannot format the json using arduinojson library in the way I want. void scanWifiNetworks() { //creating json ...
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0answers
103 views

Arduino uno wifi rev2 get json data from api

I'm not so familiar with Arduino UNO wifi rev2. I bought it for a project that I am working on. In general, I have a box that you can open with a code. The Arduino should make a call to the API and ...
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0answers
214 views

SPIFFS file append does not work when adding data in JSON format (ESP32. ArduinoJSON v1.6)

There is a file "/transact.txt", which stores the following data: { uid: 123456789 time_start: 2019-12-22 10:35:00 time_stop: } The challenge is to replace the contents of time_stop without ...
0
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1answer
797 views

publish json data to mqtt

I am trying to publish JSON data to mqtt with following code snippet #include <Arduino_JSON.h> JSONVar data; data["temperature"] = temperature; data["humidity"] = humidity; data["pressure"] = ...
0
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1answer
935 views

Serial communication from Arduino to ESP8266 NodeMCU works, but from NodeMCU to Arduino isn't working

My circuit connection is like: (I am following this tutorial) Code uploaded to Arduino: #include <SoftwareSerial.h> #include <ArduinoJson.h> SoftwareSerial s(5,6); void setup() { s....
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0answers
592 views

How to send JSON on a http POST request using an ESP8266?

I'm working on a project aimed on sending alerts via SMS. I signed up for a SMS service that works via HTTP requests (REST standard). I need, then, to send data as JSON, so that their server processes ...
0
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1answer
204 views

Second item in array not gets assigned from struct object, ArduinoJson

I got the below code generated this amazing tool. const size_t capacity = JSON_ARRAY_SIZE(2) + JSON_OBJECT_SIZE(1) + JSON_OBJECT_SIZE(4) + 2*JSON_OBJECT_SIZE(7); DynamicJsonDocument doc(capacity); ...
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1answer
195 views

Can't Compile .ino using ArduinoJson Library

I am using an ESP32 NodeMCU for which I wrote working software before. This also occurs when I just try to compile without uploading, so no hardware problem. I am using the newest version of ...
0
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1answer
63 views

Global JsonObject (ArduinoJson)

I know a global JsonObject shouldn't be used, but I have my reasons. I have a JsonObject* functions and I want him to save the content of a file. With functions=new JsonObject(jsonBuffer.as<...
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0answers
115 views

Can't print out a field with ArduinoJSON

I'm trying to create a command interpreter. Allowed commands are stored in a JSON document inside SPIFFS. If I send an allowed command, it doesn't print the field associated with that value (end of ...
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0answers
30 views

About split string

Sorry my English is poor. I use nodemcu to get a json data. By this String alldata = client.readString(); But it turn this: HTTP/1.1 200 OK Server: nginx Date: Sat, 10 Aug 2019 04:53:16 GMT ...
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0answers
480 views

How to get the value of an Arduino/ESP32 variable and use it in a Javascript file?

I have a variable in my ESP32 code. I also have a webserver that displays a HTML page, and in this page I can type a value in a form and send it to that variable via HTTP GET request. The HTML of ...
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0answers
482 views

How to get Json String from URL?

I want to get JSON string from a URL which goes like this https://maps.googleapis.com/maps/api/directions/json?origin=7649+Paseo+Santa+Cruz&destination=SJSU&key=MY_API_KEY and here is my ...
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2answers
94 views

Firmware gets stuck at obj.printto(client) in esp32

I am using an ESP32 to capture some data and then sending it over using ArduinoJson. However, sometimes, the firmware gets stuck at the line where it is transmitting data at obj.printTo(client). I ...
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0answers
371 views

ArduinoJSON v6- Add value to array

I have a JSON file stored in ESP8266, which I read need to add a value and save it back to file on ESP8266. I have an array at when saved at the first time as: JsonArray data = doc....
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0answers
286 views

ArduinoJSON v6 - return a StaticJsonDocument from a function [duplicate]

I'm reading a stored JSON file from an ESP8266. I wish to return it as a StaticJsonDocument for further use. return it at the end of function was done OK, but I need to assign it for document. #...
1
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1answer
762 views

ArduinoJSON v6 - Passing buffer as function parameter

I'm new to ArduinoJSON - so perhaps it is a newbie's question.... but I wish to pass a StaticJsonDocument into a function as a parameter ( later on it should be implemented in a library ). exmaple ...
1
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0answers
68 views

Reducing json upload time

I'm using an ESP32 WROOM board to capture some data in the field and send it over using arduino json. However, the complete process of sending and receiving confirmation takes up around 12 seconds and ...
1
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2answers
726 views

Arduino WiFi Rev2 JSON String

I have been trying to use the WifiNINA library to access the JSON output from the following API using the WifiNINA library and the Arduino Wifi Rev2. This is the code that I have been using (it is an ...
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0answers
216 views

Can't parse large json file

For a project I've to parse a big json file. Unfortunately it does not work as expected. Here is the json file: { "data1": "...
-1
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1answer
162 views

How to upload sensor data on pubnub IOT with JSON Format?

I am trying to send MPU9250 sensor data to Pubnub IOT platform using node mcu, but not able to do it since the sensor data is not in JSON format. I know about publishing string but don't know about ...
0
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0answers
103 views

SerializeJson not working when using softserial

IDE:1.8.8 Board:Arduino UNO When I use the code below, I get result of print like this. { "result": [ { "ID": "01", "Value": [ "2", "1", "13" ] } ] } But when I use SoftwareSerial and in the setup ...
0
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1answer
948 views

How to interface MPU9250 and NodeMcu?

I am trying to send MPU sensor data to Pubnub IOT platform but not able to do it since there is some unknown problem. There is no error in code but following issue pops up in com port:- It looks like ...
0
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2answers
2k views

Parse a large json response with ESP8266

I'm doing a project where my Arduino uses an external ESP8266 wifi module (with AT firmware) to send http requests and receive server response. I'm trying to get an NBA scoreboard, and here's what my ...
0
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0answers
56 views

Losing value of variable

I am making a project involving the AutoConnect, ArduinoJSOn and LedControl libraries to fetch some values from an endpoint. Basically what I do is connect to the internet, fetch the values from a ...
0
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1answer
146 views

Which is a better? GPRS SIM800L or GPRS SIM900?

I will implementate the GPRS technologity in my Arduino project, but before buy the module, I want to know which is a better. If GPRS SIM800L or GPRS SIM900? My needs are send JSON array through POST ...
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0answers
208 views

append a String on ArduinoJson Object value

I've a json string request coming from server and I convert it into json object StaticJsonBuffer<500> jsonStaticBuffer; JsonObject& root = jsonStaticBuffer.parseObject(String(msg)); ...
-1
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1answer
198 views

Library Compiler Error - ArduinoJson

I have installed via the Arduino Library Manager a library called ArduinoJson. It seems to install fine and I have included the library in my sketch using: #include "ArduinoJson.h" But when I ...
1
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2answers
157 views

ArduinoJSON: Using a reference to a reference when parsing array of arrays

I started to play around with the ArduinoJson library to parse data I got from one of my APIs (the format of the JSON data I get from my API can be improved for sure, but the software I had to ...
0
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1answer
519 views

ESP8266 SPIFFS not saving correctly?

Hey all I am having some issues with the SPIFFS for this Wemos D1 mini ESP8266 controller. This is my Arduino sketch: #include <FS.h> #include <ArduinoJson.h> struct RGBLA { uint8_t R;...
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0answers
374 views

JSON woes: parsing JSON with esp8266, can this be more elegant?

A few years back I wrote a program that pulled bus time data from the NYC MTA's "bus time" API and posted it on a wifi-connected OLED on my wall. All was well for a few years, but they changed the ...
0
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2answers
4k views

Reading file from SPIFFS in nodemcu using ArduinoJson

#include <ArduinoJson.h> #include <FS.h> /* Set these to desired credentials in runtime */ struct Config { String ssid = ""; String pass = ""; bool hFlag = false; }; void ...
1
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2answers
7k views

NodeMCU (Arduino IDE) 'DynamicJsonBuffer' was not declared in this scope

#include <Arduino.h> #include <ESP8266WiFi.h> #include <ESP8266WiFiMulti.h> #include <ArduinoJson.h> #include <ESP8266HTTPClient.h> #define USE_SERIAL Serial ...
0
votes
1answer
48 views

String class summation disappears the right operand

I intend to create a function to jsify sensors' content and save it on a SD-card or send through a http client. Except for the Serial.println's, the function is transcripted below. String jsonificar(...
1
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1answer
120 views

Arduino Uno with Adafruit CC3000

I am using Arduino Uno with Adafruit CC3000 wifi shield to connect to the internet and get data for Arduino. Everything works fine but I can't figure out how to use HttpClient library. The code is: #...
0
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1answer
2k views

Arduino JSON foreach loop

I'm trying to extract values using ArduinoJson. The values aren't fixed, therefore I need to use the foreach loop. I'm trying this, but I can't seem to use the values like I could with. root["0"]["...
-2
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1answer
565 views

Can't read JSON data from client (webpage) with Arduino Leonardo ETH

I'm reading a digital pin and count how many times that pin is enable, after that the data is sent in JSON format. All is working well till here. But I want to introduce a value from webpage to ...
0
votes
1answer
2k views

Unable to parse my JSON Data in Arduino IDE

i want to get my thingSpeak channel data into arduino by performing GET request every things works fine.Further i used Arduinojson lib to parse the JSON but i am getting failed every time when i try ...
2
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1answer
3k views

How to post JSON data from Arduino?

I want to post data that I'm getting from the sensor every 5 seconds to my application in JSON format. Initially, I'm getting data as int and converting into String. For example: if data=15, it is ...
0
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0answers
229 views

Parse JSON data from String [duplicate]

I'm getting JSON data using HTTP methods in Arduino and storing in String Object. The data is: { "item": { "Identity": { "Id": "327681", "ItemId": "64006A962B71A1E7B3A0428637DA997C....
1
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0answers
2k views

Convert String data To char Array in Arduino

I'm able to get json data and storing in String object, now i want to convert string into Char Array for parsing json data I'm tried with this code, but it is not responding String data = http....
0
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1answer
288 views

Arduino parsing JSON

I have created an API in Ruby on Rails and it send the following JSON response: {"sun_position":{"altitude":"32.46","azimuth":"223.93"}} I'm able to successfully hit the API and store the response. ...
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1answer
428 views

Arduino JSON extract using ArduinoJSON Library [closed]

I'm having a problem extracting the Object/Array from this sample json [ { "sensor":"gps1", "time":1351824120 }, { "sensor":"gps1", "time":1351824120 } ] Would anyone ...