Questions tagged [arduino]

For questions related to the IoT applications that use Arduino. If question is about software or hardware issue with Arduino, consider whether asking it at Arduino Stack Exchange would be more appropriate.

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18 views

Why would MKR GSM stop transmitting data to IOT cloud after a certain amount of time transmitting fine?

The device connects to IOT cloud fine and transmits the data for days and sometimes even weeks, but then it will stop transmitting for apparently no reason. On the IOT cloud dashboard the device is ...
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1answer
21 views

Are there Arduino boards that can be used as a small web server, supporting HTTPS?

I would like to control a relay from over the internet. I was thinking of making this using an Arduino and some wifi/ethernet shield. Searching the internet, I see a lot of shields and modules that ...
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24 views

Alternative for ESP23-WROOM-32D

A couple of months ago I designed a board with an ESP32-WROOM-32D (M113DH3200PS3Q0). Now on the Espressif product selector page they say it's not recommended for new designs! Questions: What is the ...
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40 views

Circuit Playground Express not showing CIRCUITPY drive

I got a Circuit Playground Express to serve as an anti-slumper device. Several mini-USB cables were power-only, and I tested them with the Arduino IDE and C code until one worked. I reset the board to ...
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0answers
68 views

ESP32-CAM and I2C bus connection issue

I'm trying to add I2C sensors to my esp cam but it doesn't work in either way. I followed some tutorials about it and have working code but scanning the bus shows no devices. Here is the sketch: #...
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1answer
149 views

Quality water IoT system - Which device choose

I want to develop a quality water IoT system. The picture below shows the idea. I'm not sure the device that I have to use for this project. My idea is: Every X minutes (I'm not sure the time) get ...
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2answers
50 views

When use microcontroller, when use microprocessor and when combine both

For a long time I have had a simple question to which I can't find an answer which convinces me. Basically the title: when should I use a microcontroller, when should I use a microprocessor and when ...
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25 views

Getting a custom SBC board developed to spec

I need to design a single-board computer to the following specs. Can anyone please suggest companies that could build this economically? Two full-size (USB-A) USB 3 ports A CPU fast enough to handle ...
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2answers
57 views

Is MQTT a good choice for my application?

For a university project I need to have a couple of "things" that collect data and which we will then be able to view and manipulate. At the moment each of the devices will consist of a few ...
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38 views

How to connect the Arduino MKR GSM to the Arduino IoT cloud service?

I am having trouble connecting my MKR GSM to the Arduino Cloud platform. My code is shown below: The .ino file. /* Sketch generated by the Arduino IoT Cloud Thing "Bin One" https://...
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1answer
89 views

How to speed up first Mosquitto message?

When sending MQTT messages, first message arrives within 2 seconds and subsequent messages sent within less than 20 secs from first message, arrive in about 0.5 second. I would like to speed up those “...
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1answer
54 views

How to collect data from AM 2302 temperature sensors over long wires?

I am trying to monitor the grain temperature in 4 roughly 25ft grain bins. I currently am monitoring temperature in one 15ft bin with the AM 2302 sensor, and it appears to be working. I just made a ...
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3answers
84 views

Noob looking for platform [closed]

Long time web programmer now getting into electronics as hobby projects and perhaps small custom productions. I'm partial to using microcontrollers instead of Pi's, because I'm thinking I don't need ...
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1answer
33 views

Can I disable read access to an SD card by removing the read wire? [closed]

I want an internet connected host, such as a Raspberry Pi, to be able to write uploaded files to a directly-connected SD card, but I don't want it to be able to read the card. This is for protection ...
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0answers
32 views

Particle.io argon delay time as var

I have everything working wonderfully but I want to accomplish one more thing and I'm not sure how to go about it. Part one to this question: Under command=="loops" I have a delay() function....
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27 views

How to setup SIM800L source code if the wiring to RX and TX arduino?

I have seen many tutorials about sim800l module to arduino setup. But their wiring always connect RX and TX pin of module to data pin arduino instead of TX and RX pin of arduino. Any there setup for ...
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1answer
37 views

Arduino MKR GSM/NB + CAN + SD Card

I have some questions about a new Arduino project I'm starting: Since Vodafone (Italy in my case) is shutting down 3G in 2021 (keeping 2G/4G up apprently), is ARDUINO MKR GSM 1400 still valid in next ...
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1answer
84 views

How to get stepper motor to rotate smoothly and continuously?

I'm trying to build my own motorised roller blinds based off this project. It uses the Stepper_28BYJ_48 library. The problem I'm having is that the motor is either very slow and jittery, going forward ...
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168 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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1answer
176 views

MQTT device shows as offline in Home Assistant when connection is established

I'm trying to create a Garage door sensor / motor controller and connect it to my instance of Home Assistant. My broker is the local mosquito on the Raspberry pi. The device is a Wemos D1 mini with a ...
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1answer
37 views

Best way to store the data received from aws iot core

What I am trying to achieve is that I have an Arduino base which periodically uploads data to AWS IoT-Core. But I am looking for a way to store that data and make it accessible to my web application ...
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2answers
72 views

Arduino LMIC: GPS Logger - old coordinates stuck in queue

I'm building a LoRaWAN GPS Logger using the Arduino LMIC Library. I've got a running solution which reads GPS coordinates and transmits them via LoRaWAN to TTN. For activation, I'm using OTAA. On TTN, ...
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1answer
60 views

IoT Dashboard for customers (data comes from Arduino)

I push my sensor readings from product A, B, C, D to an online cloud provider. Then my customer (call him E) needs to access all these sensor readings and make a dashboard for his customer X, Y Z. ...
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1answer
26 views

Identify the ancient IOT hardware model and find out its driver

Found from the bottom of my gadget box, I am trying to use this board for my hobby project, but I cannot even remember what model it is. Could anyone help please to identify the model of this board? ...
6
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1answer
66 views

Cannnot send from arduino to raspberry pi via LoRa

I am trying to send messages from my arduino to my raspberry pi. But I don't understand why the pi isn't receiving the messages. On the arduino side Im using an arduino UNO with a Dragino Lora/GPS ...
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1answer
86 views

How can I increase the size of the receiving sms Buffer in GSM

Recently I am working on programming IoT Project, to receive messages from the phone. That part worked, but the problem that I am currently facing is that the message does not arrive fully because of ...
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2answers
77 views

wireless moisture data transmission

I am mainly from software background with very very basic level of electronics/microcontroller knowledge. I recently did a small IoT project for moisture/temp detection following this tutorial At a ...
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0answers
44 views

Mini weather station project not working

I have been trying to do this project for 2 weeks. The project is about mini weather station. It uses esp8266, DHT11 sensor,BMP180 sensor and FC 37 rain sensor. I have taken reference from the ...
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0answers
63 views

Integrating STM32 device with smart lock via BLE

I am using a Particle Boron to integrate with a Smart lock but I am not being able to do it. I'm using Particle's BLE interface to connect to Bluetooth and start sending messages to the lock, and a ...
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1answer
228 views

switching setDebugOutput off on esp8266

This thing is driving me nuts. I tried to debug my MQTT secure connection on nodecmu. Following some post from year 2015 I was switched on debugging output with Serial.setDebugOutput(true). Now I ...
3
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0answers
160 views

ESP IDF Data backup to NVS when power goes off

I am using esp-IDF library and esp32 for smart lighting. I want to maintain the state of the lights when power goes off as it can be written somewhere in NVS. Such implementation is available for ...
3
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1answer
199 views

Fs1000a generic cheap RF transmitter compatibility with Hc12 receiver?

I have build a door sensor where arduino uno reads reed switch and transmits RF 433MHz signal to other Arduino uno connected RF receiver. I am using rcswitch library and cheap ask/ook transmitter/ ...
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0answers
17 views

Not getting data from nodemcu to the firebase

I've done almost everything to get the data from nodemcu but nothing happened. I tried by changing the fingerprint. I have also used project secret and copy it in FIREBASE_AUTH part. I also ...
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1answer
128 views

How fast can I send data to firebase from nodemcu 1.0?

I was sending some variable value to the firebase database I have created: how fast can I send it? What would be minimum time interval between two values nodemcu can send and fire base can receive? I ...
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1answer
1k views

ESP32-CAM Camera init failure, SCCB write failure

I can successfully flash my ESP32-CAM to do the blink demo but when I try to run the code below I get the following error (b/t the asterisks/bar.) It seems the "Serial Camera Control Bus" (SCCB) is ...
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1answer
42 views

Cayenne IOT widgets greyed out using ESP8266 NodeMCU-12e

I'm using an ESP8266 NodeMCU-12e, connecting to Cayenne IOT platform. Most things work fine (I can update most widgets using virtual channels), but some widgets are unavailable (greyed-out), or simply ...
2
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0answers
29 views

Custom flashed Sonoff basic doesn't work when connected to main power

I flashed a sketch to a Sonoff basic switch R2 through Arduino IDE (with FTDI). Flash is completed and Sonoff runs the sketch successfully. The code is just a typical setup for making esp8266 a soft ...
1
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2answers
557 views

How many local IoT, MQTT devices on a single WiFi router?

I am working on a dedicated WiFi network of real-time, IoT devices communicating with MQTT. Messages are very short, approximately 100 bytes. There will be at least 85 devices on the network. IoT ...
2
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1answer
78 views

Building bidirectional people counting sensor

I am trying to build a people tracking sensor for counting the traffic of a specific area (building or shopping street). I need to detect people coming in or out of a room, also if two people are ...
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1answer
1k views

What is the difference between Particle Photon, Argon, Xenon, Boron, etc?

For one project I have used the Particle Photon, an IoT device similar to Arduino, and am considering changing to a different device for another project (a motion detector that has its own question). ...
2
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1answer
44 views

Motion detector system that can be flashed remotely

I want to build a motion detector that performs a similar service to security services, which notify me upon intrusion and provide video feed. The other main requirement is that I can update the ...
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0answers
44 views

Plotting data from arduino via server [closed]

I'm sorry if I'm not posting this question on the wrong part of stackexchange, but I have no idea where to go with my needs. I have an arduino sensor that meaasures a quantity every day. The goal is ...
3
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2answers
1k views

MQTT - keepAlive using Arduino

I'm using MQTT broker for my IOT devicess, mostly ESP8266 ( some are NodeMCU, some Wemos mini, and some are Sonoff) , running an Arduino code, some time ( about a year ). MQTT broker is running on a ...
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0answers
303 views

What are lower latency alternatives to using MQTT brokers with the ESP8266

I'm experimenting with the nodeMCU board attempting to proto type out an IoT project. My first iteration involved using an MQTT broker to send messages between my computer and the board. Due to the ...
3
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1answer
194 views

How do IOT platforms like Blynk, ThingSpeak etc. communicate with hardware (e.g. ESP8266) without port forwarding?

I use port forwarding if I want to access my local server NodeMCU from internet. However if I use IOT platforms like Blynk, ThingSpeak... then I dont need to care about port forwarding. We can access ...
2
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1answer
54 views

RFID Specifications and Project Recommendations [closed]

I'm very new (one day) to the IoT world. I've got a specific project I want to tackle, as a intro to IoT, but I'm also open to general advice on getting started. In summary, I want to know if my ...
0
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1answer
46 views

ultrasonic sensor reflecting waves in water or not [closed]

When an object is kept opposite to an ultrasonic sensor, it reflects the waves. In case the object is water, does it reflect or not? How does one know?
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1answer
190 views

Water meter reading using LORA

We need to get reading of meter using LORA. Previously, we have used NodeMCU with Wifi module but it contains short range. We need long range which will be around 10 km to 20 km, So we must need to ...
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2answers
67 views

Where to find descriptions of the example ESP32 sketches in the Arduino IDE?

I chose this one at random https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266WebServer/examples/HelloServer/HelloServer.ino but looked at the code of others & hope that there is ...
16
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2answers
704 views

What is a good way for an IoT device to receive its network settings?

I'm in the process of building an IoT device using ESP8266. The device will eventually contain a couple of motors, and I would like to control these motors using MQTT. I would like to make the device ...