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Questions tagged [iot]

A new paradigm where many, typically microcontroller-driven embedded systems are connected by the Internet, and they are cooperating with eachother to reach common goals, without requiring human-to-human or human-to-computer interaction.

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1answer
49 views

creating HTTP persistent connection, to create 'smooth' data over GSM sending

Project goals Send data over GSM to firebase Fast sampling - need to send 16 bytes every half second to firebase Send data using GET or POST to server with php script, that redirect data to firebase ...
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0answers
21 views

Send data from arduino to server using GSM, TCP

My actual connection is like: Arduino -> GPRS(http)-> my server(php script)-> firebase <-android plotting app But it only allows to send some data once every 2 - 3 seconds (depending of ping to my ...
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0answers
12 views

Connect ESP8266 to AWS IoT core using JITR method

I am trying to connect ESP8266 to AWS IoT core using JITR(Just in time registration). For that I need to create a device certificate using the rootCA certificate registered in AWS IoT. Ho can I create ...
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0answers
12 views

Not able to receive data on node mcu from pubnub

I am trying to send data from one node mcu to another using the same wifi for now. I can publish the data since I can see it from my pubnub analytics but not able to receive the data. When I used 2 ...
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0answers
24 views

ESP8266 http.get() issue due to wifi authentication failure

Facing a weird issue while reading data from esp8266. I am trying to read dynamic data from a demo text file on test server on same network in deep sleep mode. Case1: Joining new network I am using ...
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1answer
20 views

MXCHIP IoT DevKit too many initializers for 'unsigned char [0]

Question Trying to call the Display draw API using the sample code for the azure logo bitmap sample code. I'm unable to reach a point where I can the API because breaks when constructing the bitmap ...
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0answers
29 views

MQTT subscribe callback fails to be called in ESP8266 deepsleep mode

Refer to ESP8266 deep sleep and MQTT I executed the code in the given link. However i am not able to receive the subscribe message that are send from MQTT test broker(MQTT Lens) on the serial ...
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2answers
50 views

How to get a list of IPs in a LAN using NodeMcu?

I'm going to create an IoT system. I use a Raspberry Pi as a MQTT broker and as a webserver. Every day, the Pi gets a new IP address, so I need to find its new IP address via ESP8266 to use this ...
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0answers
20 views

Is it possible to send data at 100Hz using Wifi bee ESP V1.0 to Mobile (Xamarin)?

Im currently using WifiBee ESP V1.0 and Lilypad Arduino as well as AD8232 for ECG. We are trying to send the data to mobile phone by connecting to PubNub.` if(Serial.available()>0){ str = Serial....
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0answers
16 views

Arduino clients suddenly not able to connect (or publish) to MQTT

we are struggling with a project that has things (arduinos as clients) communicating to our MQTT broker (mosquitto) running on a DigitalOcean droplet (inside a docker). We have about 200 things at ...
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1answer
30 views

Not able to convert String to Integer when receiving data from pubnub?

I did managed to upload mpu9250 sensor data on PubNub and nodeMcu but not able to use the received data to control servo Look at the Port reading and see that servo angle is still showing '0' Code:-...
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0answers
56 views

How to achieve active 4G LTE communication?

I'm not sure if this is correct place to post this, if not PLEASE redirect me to the proper page, as this matter is quite pressing to me. My entire day was spent researching different methods of ...
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1answer
30 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 ...
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1answer
169 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 ...
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0answers
39 views

Arduino communication to Particle (Photon)

I initially wanted to connect a K30 CO2 sensor to Particle Photon and send the data to cloud. Simple. However, it turns out that there are no libraries that support the use of K30 CO2 sensor to ...
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2answers
70 views

Is it possible to connect miband2 and arduino nano (?)

I want to make an IOT project using an Arduino nano and I need heart rate sensors. I I have a miband2. So, is it possible to connect them ?
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0answers
104 views

[SOLVED]Arduino SIM5320e HTTP GET request to 000webhost.com

Im having trouble getting a successful HTTP GET request to a domain under 000webhost.com I am trying to do a GET request which sends data to a php file on my domain and save it to MySQL database. I ...
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0answers
16 views

Can't connect to the server

I am working on a specific project that requires a database. I have done the 'connection' and the "write" of data using a PHP file. I have even reconfigured everything so it would be possible to ...
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0answers
75 views

How to use ESP8266 with Google API for GPS as well as controlling Arduino pins

I am working on IoT based project and I want to control the device using mobile App. Everything works fine, I can switch the load and get the status back on mobile app, but I want to use my ESP8266 as ...
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votes
1answer
87 views

Can't extract basic data using ThingspeakHTTP

I don't know anything about HTML, but I want to extract the % probability of the Northern lights being visible from this webpage http://aurorawatch.ca/. I entered this into the URL field, and selected ...
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1answer
50 views

WSO2 IoTS : No Data shown on Server by Arduino connected via Ethernet

Description: While enrolling Arduino device on WSO2 IoT server, I made necessary(WiFi to Ethernet connection) changes in the sketch that I downloaded from the server and uploaded it. The following ...
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1answer
117 views

Websockets with the ESP8266 using arduino uno board

I'm trying to make an iot device that connects to my wifi, establishes a socket connection with my golang backend and then starts to send sensor data from the ardunio. I've got an ardunio uno board ...
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1answer
547 views

Arduino sketch for NodeMCU v1.0 (ESP8266-12E) has no error of compiling but does not run on NodeMCU v1.0 (ESP8266-12E) Board

i compiled a Arduino Sketch for NodeMCU v1.0 (ESP8266-12E) which have no error while i test with verifiy button in Arduino IDE 1.8.6 but i don't know what is the problem when i upload and test it . it ...
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1answer
78 views

The right way to find and understand the libraries

I am working on a project to send sensor values from esp8266's Wemos D1 mini to MySQL. I tried using the library MySQLconnection.h but I couldn't make it to connect to wifi. So I uploaded a simple ...
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2answers
2k views

Ethernet nodemcu

I have a question that might be a #noob question but I am wondering if there is a board similar to the nodemcu in size that runs arduino code but instead can use ethernet to connect to the network ...
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1answer
204 views

Arduino DDS IOT ESP8266 controlling AD9834

first post, having probs with uploading sketches on win10, blink sketch loads but when I try either of 2 sketches which have been specifically coded for this duino I get the following error: ...
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2answers
52 views

How can an Arduino determine the status of a washer or dryer using only vibration data? [closed]

I'm trying to make an IoT washer/dryer device that will text me whenever my load is done. I was initially thinking to make assumptions about what data it should be receiving when the washer/dryer is ...
0
votes
1answer
60 views

servers , free domains with ESP [closed]

Lets Say That I Have a routine like: I have written PHP codes for the free domain that will: Wait for request like url/control?ToDo="someMethod",parm=Something (posting some password for ...
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0answers
162 views

What causes the ESP8266 wifi module to hang after multiple post or get requests?

I have a source code for sending GET request via ESP8266 that was working just fine a couple of weeks ago, but now it just hangs after sending a GET request until it times out and I just don't know ...
0
votes
1answer
548 views

Arduino Uno with ESP8266 Wifi transceiver or ESP8266 NodeMCU board?

I already have an Arduino Uno, and I want to learn Internet-of-Things. I'm planning to use an ESP8266 since it's cheap. Should I purchase an ESP8266 Wifi transceiver module to use with my Arduino Uno ...
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1answer
172 views

ESP8266 sends data to the website but doesn't return status

I have problem with my esp8266 it connects to my site and sends 89 bytes of data but does return a confirmation status all i get is SEND OK but i don't get any confirmation from my server This is my ...
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0answers
2k views

How to listen to multiple server ports with ESP8266?

I'm using WeMos D1 R2. I'm trying to listen to both ports 1992 and 1993. This is my current code: #include WiFiServer server_1992(1992); WiFiServer server_1993(1993); void setup() { Serial....
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0answers
73 views

Ultrasonic Sensor Distance problem [closed]

I Am facing a problem measuring distance with an ultrasonic sensor. I am doing an IOT garbage system and dust levelling is measuring by the ultrasonic sensor. But ultrasonic sensors not giving the ...
0
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1answer
170 views

NodeMCU successfully uploaded sketch but it does not work from Arduino IDE

NodeMCU successfully compiled and uploaded a simple blink sketch on board, no errors at all, but the LED stays on constantly and does not blink. Also I have checked the power is enough. I have checked ...
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0answers
264 views

ESP8266 doesn't connect to WiFi

I'm using an ESP8266 with the following pin configuration and it doesn't connect to my WiFi. The blue light on the ESP module is on and my LED is on. That's it. VCC - 3.3v GND - GND CH_PD - 3.3v GPIO ...
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2answers
11k views

How to post HTTP POST requests on my website?

I am working on a NodeMCU board to post sensor data on my website service. Basically my project is about POST and GET requests both in single code. I am succeeding in sending GET requests from my ...
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votes
1answer
2k views

how to remove this error “invalid conversion from 'const char*' to 'uint8_t ” [closed]

C:\Users\lenovo\Downloads\Adafruit_MQTT_Library-master1\examples\mqtt_esp8266\mqtt_esp8266.ino: In function 'void setup()': mqtt_esp8266:63: error: invalid conversion from 'const char*' to 'uint8_t {...
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1answer
77 views

Changing outputs infinitely for no reason

Im a student and working on a arduino project for IoT competition and me and my team have built a house and I made this code below. For some reason when I upload it to my Arduino MKR1000 it constantly ...
3
votes
3answers
1k views

ESP8266 disconnects after few hours

My system looks like this: ESP8266 is connected to Arduino Uno (2, 3 pins) and a relay's data input to Arduino's pin 12 and power for relay is provided from another source. Arduino gets data from ...
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2answers
50 views

Is there any way for one Arduino board to communicate with multiple sensors? [closed]

Say a home IoT application to monitor water levels in basement at 4 or 5 different places and transmit that data back to a single Arduino board to be then interfaced with a GUI to do home monitoring?
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2answers
475 views

SSID was not declared in this scope

so I am new to arduino and coding in general, I am trying to use the arduino to remotely survey plants, I am using this guide: https://create.arduino.cc/projecthub/arduino/plant-communicator-7ea06f. ...
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votes
1answer
143 views

esp8266 not defined in scope while using in class

Below code was working fine without using classes, after using class an error pops up: esp8266 is not defined in this scope #include<SoftwareSerial.h> #include<ArduinoJson.h> #include<...
5
votes
2answers
11k views

Simple GET request with ESP8266HTTPClient

I am trying to do a simple GET request. But I always get status code -1. Here is my complete code. #include <Arduino.h> #include <ESP8266WiFi.h> #include <ESP8266HTTPClient.h> ...