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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33 views

Arduino Nano IoT Power Consumption

I am trying to reduce the power of my Arduino Nano IoT. I would like to run it using a battery over a longer time period. I thought this would be possible when putting it to sleep most of the time. ...
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18 views

Arduino MKR QoS 1 logging with ArduinoMqttClient

I am collecting data with Arduino MKR GSM 1400 and sending data to Azure Cloud (IOT HUB). Currently I use ArduinoMqttClient ArduinoMqttClient My question is, how to ensure both parties accepted QoS1 ?...
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esp8266 using thingspeak for iot light on project via google assistant fatal error everytime

fatal error timeout and unable to connect to thingspeak for fetching data sent via google assistant (ifttt) #include <LiquidCrystal.h> #include <SoftwareSerial.h> //ESP is connected to ...
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28 views

Interface gps and ultrasonic sensor simultaneously

I am able to interface gps and the ultrasonic sensor and obtain data successfully for individual interfacing with the Arduino UNO. When I combined the code for these two, I only get the data values ...
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74 views

Relay board not working with nodemcu

This is the relay board I am using nodemcu to make a home automation project which is controlled by google assistant. This is the code i am using is this one #include <ESP8266WiFi.h> #include "...
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198 views

Reading Data from Google Sheets using Nodemcu

I want to read and writ data on Google sheets using ESP8266 WIfi Nodemcu and I'm able to do it but the time interval between two writing row is 3 seconds which is too much. I can read data but I am ...
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25 views

ESP 01 calling Pushing Box API

I want to write my data on google sheets using ESP 01 and Arduino Nano. So I copied code from some website I don't remember the website "how to send data on a local server" and modified it a bit. But ...
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1answer
59 views

Waking an ESP8266 from Light-Sleep using a signal from MQTT?

I was wondering if it would be possible to wake an ESP8266 from a request over MQTT while it is in Light-Sleep mode? I am planning to implement a smart switch that would receive messages from a ...
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97 views

ESP8266 WiFi.begin() isn't working

I did a project for IoT attendance system using ESP8266 and RDM6300. However, I can connect to wifi using WiFiMulti.addAP() function for my home WiFi. I tried WiFi.begin() instead of WiFiMulti.addAP(...
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1answer
78 views

Charge lipo battery while using

I have a system that uses Arduino and some modules. The system needs 5v dc power with 3A current at maximum(The system needs 3A current for some seconds every 5 minutes and after that the current will ...
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24 views

connected collar with GPS, temperature and heart rate sensors + microphone

I am taking part in a project as part of a challenge and I'm in charge of the embedded systems part, this is my first time working on a project of this scale. I am looking for a way to wirelessly send ...
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1answer
41 views

Adding WiFi to my Arduino Keypad Lock

I'm a really passionate beginner with arduino and electronics and I've built a Keypad lock for my room's door (inside the house). I've used an arduino that activates a motor using a transistor to ...
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119 views

Blynk.Begin(auth, ssid, pass) causing watchdog reset

I am trying to follow this tutorial and I keep hitting a problem repeatedly. I checked in my code that every time it hits the line Blynk.begin(auth, ssid, pass);, the serial monitor shows me that ...
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63 views

ESP8266 webserver does not return latest HTTP response

I tried getting a HTTP response from an ESP8266 which is in HTTP server mode, I am getting a response but not the latest one, response is always one command previous to that of my request to the ESP. ...
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1answer
138 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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96 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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16 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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88 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
77 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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207 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
111 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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41 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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28 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
58 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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160 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
104 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
576 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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115 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
234 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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2answers
197 views

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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20 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
125 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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1answer
201 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
54 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
301 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
825 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
87 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
4k 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
301 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
65 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 ...
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1answer
103 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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1answer
828 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
321 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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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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87 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 ...
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1answer
262 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
323 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
2k views

ESP8266 + DHT11 AWS IOT Thing not updating thing shadow - was working before

I was able to get this working - https://www.youtube.com/watch?v=8hpro1olRK0 - send an SMS and email of temperature and humidity data from AWS IOT using esp8266 + dht11 but all of a sudden it stopped ...
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2answers
19k 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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1answer
3k 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 {...