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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22 views

ESP8266 wifi connects to DLink DSL2750U but not to DIR615

Earlier all my ESP8266 Wi-Fi modules connected and functioned well using D-Link DSL2750U router but now since I changed to D-Link DIR615 router none of the same ESP8266 wi-fi modules connect. (SSID ...
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25 views

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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20 views

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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105 views

How to get text type form data from a website hosted by esp8266 webserver in arduino

I am learning to use esp8266 as a web server. I have done a simple example of controlling the on board LED from a HTML page hosted by esp8266. As a further improvement I wanted to add a password ...
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39 views

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 WI-FI and BLE connectivity Solderless board Test OTA ...
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41 views

Arduino Nano IOT 33 port won't show up

I run my Arduino Nano IOT 33 after double clicking the reset button and it works fine. However, as soon as I upload code to it, I cannot open the serial, see the port, or connect my blynk app to it. ...
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27 views

Arduino Nano 33 IoT not connecting to WiFi

I have been using my Nano 33 IoT for a while now and it has been behaving perfectly. All of a sudden though, I just cannot connect to WiFi. I am using the WiFi Nina library. Everything is updated to ...
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1answer
25 views

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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104 views

I need a singal MCU with an RF resever [closed]

I have been thinking about wireless sensor networks and home automation for a long time. I need a single MCU with an RF resever. It is best if the pin8 is in a small package. Can anyone help me?
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40 views

How to increase the frequency of data transmission of SIM900A GSM Module connected to Arduino Uno?

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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3answers
119 views

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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72 views

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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66 views

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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20 views

Make Arduino Nano 33 IOT talk to another Arduino via Bluetooth

I have an Arduino Nano 33 IOT and I want it to talk to another Arduino that has an HC-05 Bluetooth module. Is this possible? I cannot find anything on the internet that talks about doing this.
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33 views

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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79 views

Multi tasking alternative on NodeMCU ESP8266

I'm trying to make an RGB LED strip controlled via Wi-Fi and IR. Until now, I just have made the Wi-Fi server, and It worked just fine. But I wanted to be able to turn the LED strip on and off via IR, ...
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1answer
113 views

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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29 views

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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31 views

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 ...
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42 views

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 ...
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2answers
63 views

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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51 views

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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1answer
27 views

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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1answer
52 views

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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296 views

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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44 views

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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1answer
91 views

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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1answer
157 views

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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1answer
67 views

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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89 views

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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173 views

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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1answer
102 views

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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69 views

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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46 views

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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1answer
30 views

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 ...
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117 views

node mcu disconnect from mqtt server

/* Basic ESP8266 MQTT example This sketch demonstrates the capabilities of the pubsub library in combination with the ESP8266 board/library. It connects to an MQTT server then: - ...
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92 views

NodeMCU unable to connect to mobile hotspot when I include codes for reading the temperature sensor

Good day. The NodeMCu successfully connected to mobile hotspot when i didn't put any others codes except the Wifibegin etc. Howveer when I include some codes for temparature sensor, it keeps on ...
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135 views

Unable to find/connect I2C devices (SHT31 & SGP30)

I have recently purchased an Arduino Nano 33 IOT together with two sensors: Adafruit SHT31-D (https://learn.adafruit.com/adafruit-sht31-d-temperature-and-humidity-sensor-breakout) Adafruit SGP30 (...
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2answers
995 views

NodeMCU ESP8266 disconnected from WiFi after several hours running

I tried to test NodeMCU ESP8266 with this code from here #include <ESP8266WiFi.h> #include <WiFiClient.h> #include <ESP8266WebServer.h&...
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21 views

Missing ArduinoJson/DynamicJsonBuffer.hpp

I have read other posts regarding ArduinoJson that recommend using a library version no later than 5.14.3. That recommendation is more than a year old - is it still the recommended library version?
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72 views

Firebase.failed() returns 0 after Firebase.begin(), but returns 1 while reading or writing from/to firebase from ESP8266

The program was running fine, a few days ago, but now it just wouldn't read/write to the database. I'm running on ArduinoJson 5.13.5 and using FirebaseArduino library. I have set all the rules to true,...
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238 views

ESP8266 not posting to firebase, Firebase.error() does not return anything

Below is the code that i tried and it was working before i added NTP client and WiFiUdp . The credentials are all right. I even tried commenting the newly added portions, but now, all I am getting is ...
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585 views

Cheaper alternative to Arduino Nano 33 IoT with BLE?

The Arduino Nano 33 IoT looks great with its builtin Bluetooth chip. At ~€20 (Germany) it's pricey though and seems overkill for what I need anyway. What is a good, cheap alternative for a simple ...
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123 views

Random characters transmitted from ESP8266 to Arduino

Below is the code for getting a value from Firebase and sending the received data to arduino for performing necessary action. The code here here sends a string "o" to arduino once //uploaded to ...
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69 views

Fixing serial communication , condition for serial data available checks out even after reading all the data sent

I have been working on monitoring an aquaculture , where I log the environment variables (temp. , humidity, gas sensor data) to firebase and control feeding mechanism via an app(where data can also be ...
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59 views

How to set ALPN ProtocolName when negotiating SSL using ArduinoBearSSL

I am trying to set up an Arduino MKR Wifi 1010 to push MQTT messages to AWS IOT. I am following this tutorial https://create.arduino.cc/projecthub/Arduino_Genuino/securely-connecting-an-arduino-mkr-...
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695 views

Why i'm i getting “Error compiling for board NodeMCU 1.0 (ESP-12E Module)” with AzureIoT libraries

Hey guys am sure you are tired of seeing this question on many posts, truth is until now I have not come close to a solution and am just a beginner/intern trying to send some temp/humidity data to the ...
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198 views

Arduino MKR 10100 control DC Motor

Thank you for reading my post. I have been stuck on this for several weeks now! I am trying to turn ON/OFF a DC motor from Arduino IOT Cloud. I have set up the cloud and added the switch. Everything ...
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61 views

aRest.io - how does it work?

With aRest.io you are able control your Arduino/Esp from all over the world - but how? In the Client SourceCode (found here) you only find the PubSubClient, which is an MQTT client. I'm assuming: ...
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49 views

Dragino Lora shield for Arduino sensor use

I am new to arduino and lora technology and i have dragino lorashield for arduino Uno and dragino gateway. I have also MQ-3 gas sensor and I want to detect the alcohol value and to send it to the ...