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.
108
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ESP32 setting up HTTPS connection to AWS S3
I am trying to send https requests from my ESP32 board directly to S3 to upload/download files. I use the arduino framework in a platformIO project in VScode on Windows. I am already using MQTT and ...
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34
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How to connect to AWS iot?
I am trying to connect esp8266-12f to aws iot core following this tutorial. Below is my code.
main.cpp
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include "config.h"
#include &...
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1
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351
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how to transfer json to string?
I am getting a json object from aws iot MQTT. Assuming that json from aws is {status:opened}.
Here is my code.
#include <ArduinoJson.h>
void messageHandler(char *topic, byte *payload, unsigned ...
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199
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How to do MQTT with TLS to IoT Hub over Ethernet (Not WiFi)
Context
I'd like to do D2C publishing to Microsoft Azure IoT Hub using MQTT thru Ethernet (and not thru WiFi).
The firmware runs on my ESP32-based custom PCB to which an Ethernet module (aka Wiz5500) ...
- 163
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52
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Cannot connect Arduino MKR 1010 WiFi to Azure IoT Hub via X509 CA Signed certificate
I am facing some issues connecting my Arduino MKR 1010 to Azure IoT Hub and I do not have any other options than open a discussion here. I really hope that someone will be able to help. So, what I did ...
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170
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Connect Arduino + ESP8266 to Azure IoT Hub Device via X509 certificate
I would like to connect ESP8266 with Azure IoT Hub Device via X509 certificate. Currently, I can connect using the symmetric key connection to my device, but I have devices that I want to authenticate ...
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37
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Arduino MQTT Library sending disconnect packets even though it is not called
I am trying to connect to AWS IoT through the Arduino Portenta H7 and I am following this blog (https://create.arduino.cc/projecthub/Arduino_Genuino/securely-connecting-an-arduino-mkr-wifi-1010-to-aws-...
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192
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HTTP POST maximum speed at command SIMCom A7672
I'm trying to build a device for my startup IoT-related, using an A7672S.
Here is the code:
mySerial.println("AT+HTTPINIT";
checkresponse("OK\r\n");
mySerial.println("AT+...
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1
answer
431
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Problem with "converting a string constant to 'char*'" in the WiFi library
error:
C:\Users\mrtas\Desktop\sketch_may23a\sketch_may23a.ino: In function 'void setup()':
C:\Users\mrtas\Desktop\sketch_may23a\sketch_may23a.ino:41:24:
warning: ISO C++ forbids converting a string ...
- 11
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108
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Azure IoT times out while trying to send a message from an ESP32
I am looking for a working example of an ESP32 sending telemetry data to Azure IoT hub. I find nothing working around the internet: below is the code I am trying to make it working.
As you can see in ...
- 163
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5
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480
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How to make better looking webpages on an Arduino webserver?
I have a Teensy 4.1 with ethernet, but I have other networked MCUs like a D1 mini, various ESP8266s and Arduino ethernet shields.
My question is: how I can make better looking web pages on these ...
- 882
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205
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How to fix this problem of invalid conversion from 'const char*' to 'char' [-fpermissive] [closed]
Im working with node mcu ESP 8266 and trying to make it a webserver but keep encountering this problem.
#include<ESP8266WiFi.h>
WiFiClient client;
WiFiServer server(80);
void ...
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2
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184
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How to read wireless doorbell's indicator LED circuit
I have a cheap wireless doorbell. My plan is to include an ESP8266 and power the doorbell from the microcontroller 3.3V output as the doorbell also runs on 3V
I specifically chose a model with a LED, ...
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Arduino MKR NB 1500 websockets
I am trying to implement websockets for MKR1500 and I am having trouble finding a perfect example to implement it. Can someone guide me to an example that works with MKR1500?
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Audrino mkr1500 keeps going offline
I am using a MKR1500 with an Arduino SIM. I am able to upload the code on the device using the web editor. But when once I am done uploading the code, the device shows status offline and I am unable ...
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Can I add my Wi-Fi credentials to ESP module remotely?
I am working on Home automation project and I am stuck somewhere on connecting my smart switch board to internet through my home WIFI. Actually I want to connect my ESP module with my home Wi-Fi ...
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533
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Multiple MQTT topics
I have 3 nodemcu's(ESP32) each connected with a sensor, from which I get data and send it to aws IoT-core. How can I send all 3 sensor's data by a single MQTT subscription? The below code is for a ...
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1
answer
1k
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Connect ESP32 via MQTT
For a project I am working on, I need to connect my ESP32 board to another server via MQTT protocol. I am using the Mosquitto MQTT Broker and it is presently on my laptop. Following is the test code I ...
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171
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I can't turn on the motor by Arduino IoT Cloud
I'm trying to turn ON/OFF a DC motor from Arduino Iot Cloud. I have to turn it ON/OFF physically and through the cloud, physically it works well but from the cloud it does nothing. I'm using an ...
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Arduino MKR GMS alternative
I’m starting on a project about monitoring the soil in the agriculture field and also to visualise the data remotely. The aim of this project is collect the atmospheric data as well as the soil ...
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ESP8366: ets Jan 8 2013,rst cause:4, boot mode:(1,7)
I am trying to control esp8266 esp 01 with Alexa
This is my code:
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include "fauxmoESP.h"
#define ssid "admin"
#define ...
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1
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79
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Any explanation for this behavior?
For the below code snippet
const char* fr_fbdb(char tag[30]) // fn for retrieving data
{
char full_path[120];
const char *_dt ;
strcpy(full_path , base_path);
strcat(full_path , tag);
...
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1
answer
656
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Reading a string from Firebase and storing it as a CString
I have a mobile app (done using MIT App Inventor) storing some values to a Firebase database. App inventor stores all the values as strings (i.e. with quotes, and strings have quotes enclosed within ...
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0
answers
29
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4004 (NOT_FOUND) ON MQTT
I tried to send random data to MQTT but it's not working and I get:
{
"m2m:rsp" : {
"rsc" : 4004,
"rqi" : "123456",
"pc" : "Resource not found",
"to" : "5a185cedc6ad749b:...
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1
answer
52
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What are the Arduino hardware options for experimenting with IoT?
Just starting to learn about Arduino and IoT. I'd like to know what the Arduino hardware options are to try the following:
Use FreeRTOS as SO
WiFi and BLE connectivity
Solderless board
Test OTA ...
1
vote
1
answer
112
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Send commands from cPanel website to client ESP8266
I have a project where I want to remotely turn on and off a relay using an Arduino,(ESP8266) over the internet.
I have a remote web server that hosts my existing hobby website, cPanel hosted by ...
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87
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How to increase the frequency of data transmission of SIM900A GSM Module connected to Arduino Uno? [closed]
I have a SIM900A GSM Module hooked onto an Arduino Uno board. The Arduino is connected to a MPU6050 Accelerometer which is constantly monitoring data at 1 second interval. I am trying to transmit the ...
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137
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variable name standards, e.g best method to send motion_detect=true
I am working with some sensors and sending data to a public web server via http, I was thinking this server can be possibly used by more people to send their data and server displays a chart.
I was ...
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511
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My nodemcu esp8266 is heating a lot and the on board LED of gpio16 is On continuously. What's the Reason of heating?
How it happened
Recently I was working on a device with Blynk application in which my device will burn crackers using Blynk. I wanted to create a safe environment for burning crackers. There was a ...
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1
answer
639
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Raspberry Pi 3B+ BLE communication to Arduino Nano 33 IOT
I have an Arduino Nano 33 IOT and it uses BLE. I want it to talk to my Pi 3B+ and send all of its sensor data. I cannot figure out a way to do it using Python for the Pi and ArduinoBLE library for my ...
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How can I use Arduino Analog Uno pins as Digital pins? [duplicate]
How can I use Arduino Uno Analog Pins as Digital pins, So that I can Attach more components like sensors to the Arduino? My 13 pins are preoccupied and I want more.
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770
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Programming ESP8266 to avoid random exceptions?
Below is the code that I have done on Lolin Wemos D1 R2 and mini it works fine but it throws exceptions every time, I tried understanding my problem by reading this: NodeMCU 1.0 - Exception 9 `Fatal ...
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serially parse integer after serially read
I want to write below code but I don't know where I doing wrong, so please help me solve this issue.
Serially read some text like number then I want to serially parse integer value into some variable ...
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Send message to multiple number
sim.println("AT+CMGS=\"+91xxxxxxxxxx\"\r");
I don't want to write this. I want to write mobile number on serial monitor in Arduino and on that number, i want to send message. how ...
- 31
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0
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255
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Send data from GSM module to cloud server like firebase
I am trying to search for anything to send my sensor data from Arduino + GSM SIM900A to a cloud server, preferably firebase. Does anyone know how can I achieve this operation to firebase or any other ...
- 175
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2
answers
496
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Using ESP32 Cam internal RAM
I am new to the ESP32 series of boards.I powered up my ESP32 Cam board using the Vcc pin supplying about 7.4V using two 18650 batteries only to find out later that was a completely incorrect way to ...
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Error "cstddef: No such file or directory" on use AzureIoTHub
Good Morning
I'm trying to integrate with Azure IoT with Arduino Mega 2560.
I imported the AzureIoTHub and AzureIoTUtility lib.
I just created this part of the code
#include <AzureIoTHub.h>
...
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1
answer
42
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circuit breaker/fuse necessary for IoT home monitor?
In most 12v CCTV power supplies, each power cable is behind a glass fuse. I haven't seen fuses or circuit breakers used when distributing 5v power used in IoT projects. Is there a reason overcurrent ...
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1
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522
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Relay with NodeMCU is not working
I'm using a Relay Channel and NodeMCU(8266-WIFI). When i trigger the connection, LED Turns ON in Node MCU But the Relay connection is not working. I'm not sure what is the issue, Please help to fix it....
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esp32 http client response only 200 didn't receive the data after that
i am using esp32 as a client and using following example. So here i am getting header response only that is 200. I am not getting any response after that. here is the example
#include <WiFi.h>
#...
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52
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What methods are there for tracking presence in rooms?
Im wanting to automate the lighting in my house, e.g. turn on lights when entering a room without having to fumble around with my phone or switches.
I have looked at audio, PIR and radar sensors, are ...
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1
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812
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Is there possible implement websocket using AT Command?
For example I have a sim800l module to communicate to a server using websocket (socket.io) but that module allows AT Command to operate.
I have successfully made an HTTP request, but I don't know how ...
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1
answer
529
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how to get esp32 ip address ,which is being connected to local network
I need to know the IP address of ESP32 on the local network(without printing ip on serial monitor ). The idea is to do mDNS or UDP broadcast to send the IP to the android application. The app will ...
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1
answer
190
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Arduino Nano IoT 33 Char Array size constraints
I would like to save data that I am receiving from API calls in a char array. The problem is the data is around 80KB however my Arduino IoT 33 has 32KB of memory. It will save data in a char array ...
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Saving Power :: Reducing Power Consumption
For Arduino Nano 33 IoT, I want to turn off everything except Bluetooth and Wireless since I don't use them.
My question please: Can I switch off / deactivate the IMU sensors completely? If yes, How ...
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how to get live view of esp32cam at remote sever using ssh tunneling?
I have found many projects involving esp32cam, but in all projects video is being seen on local server only.For its of no use.As for a home security project user can view the video at remote location ...
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393
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Which Protocol to use to control WiFi (esp 32) enabled Led Light
I am developing a Wifi based Led light (for learning purpose). I have little knowledge about web server, clients, Web protocols. I will be using ESP32 as Controller cum WiFi module.
There are two ...
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1
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423
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nodemcu doesnt response in at command mode
I want to sent AT command into node mcu esp8266 module with arduino IDE through serial monitor.
I connect the node mcu to arduino uno board in following sequence:
RX to pin 2 of arduino
TX to pin 3 ...
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51
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How does code typed in Arduino IDE runs on a nodemcu?
I actually have a series of questions regarding Nodemcu and esp8266.
How does code typed in Arduino IDE run on Nodemcu?
What firmware is present on the nodemcu?
How do I upload the above firmware on ...
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1
answer
105
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Can a MEMS accelerometer sensor be used as a shock sensor?
I am trying to make an IOT project- SMART DOOR where I have used a serve motor and NodeMcu and for adding further functionality I have been thinking of adding a theft detection feature where whenever ...
