Questions tagged [wireless]
For questions about non-wired communication in IoT devices, particularly where you do not have a specific protocol or transport in mind.
72
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23
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Credit/debit card machine to send bill to mobile app after payment
Hi all I'm totally new to iot, I just wanted to know if it's possible to send the bill from a credit/debit card machine to a mobile app after a payment, would to be possible, if yes any specific ...
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1
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189
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Matter node behavior in Matter protocol
What is the difference between MQTT and Matter protocol? Can I send Matter message between two different networks if Matter devices using link-local address?
- 31
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18
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OpenMote B wireless communication
Is it possible to make two "OpenMote B" devices communicate with each other (through WiFi or on other frequencies), transmit and receive data?'
If yes, is there an example of such code to ...
- 11
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0
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34
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UDP communication with XBee Wi-Fi S6B
I am an absolute newbie when coming to using these modules. I am trying to setup a basic UDP connection between my XBee S6B (UDP Client) to my computer (UDP Server). I have added my codes below. The ...
- 11
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2
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71
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Sending sensor's binary signal to the cloud through a wireless settings
I’m relatively new to iot and I'm looking for ways to send a binary signal from a tiny sensor (size of a coin) to the cloud through a wireless setting.
Basically, sensors would emit a simple binary ...
- 101
4
votes
1
answer
155
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Standalone NFC/RFID with WiFi/ethernet network connection
I spent many hours looking for a device for my iot project. So far, everything I find does not meet my expectations. I prepared two prototypes - one based on rpi zero and one based on esp32, but I ...
- 41
1
vote
1
answer
124
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Which radio technology for long distance, high(er) power, IP traffic?
I'm looking to build a long distance IP star network using one of the IoT PHY layers but unsure if LoRa is right. An ideal solution would be something to the effect of 915Mhz WiFi or WiFi HaLow ...
- 121
6
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2
answers
10k
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Why arp -a does not show all devices connected to WIFI? [closed]
I am trying to see the IPs of all the devices connected to my WIFI. Everyone suggests to use the command arp -a in the terminal but when I do so I get always the same list of devices. I try to connect ...
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37
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Are there still any cheap hardware solutions to providing IoT devices with cellular connection with the shutdown of 2g networks
I am currently attempting to design a small custom PCB based IoT business cards that communicate over a cellular network for the purpose of impressing employers. Since I will literally be giving these ...
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1
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94
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Non-locally Electrically Programmable Logic Gates - Technological Advances Progress
Preface: I’d like to clarify that I understand what a relay is and that a PLC uses a fairly conventional microprocessor that only digitally establishes logical logic gate configuration as a digitally ...
-1
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1
answer
93
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What is a pseudocode breakdown of the MQTT protocol for cellular devices?
I was wondering if anyone can give me some pseudocode structure that outlines the general procedures that need to happen to connect over cellular to a remote server using MQTT? To be specific, I ...
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162
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Cannot connect to softAP hosted on ESP32 IoT device on Windows 10
I have an IoT ESP32 device that needs to be configured through its softAP WiFi. When I enter the credentials of that network I get "cannot connect to network". I suspect that it's because ...
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2
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212
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Is there a wireless video doorbell that will chime on Google Nest speaker?
Most smart doorbells (e.g. Google Nest Hello doorbell) seem to require a wired connection. The Ring wireless doorbell looks like the most popular but compatibility with Google Assistant looks poor. I ...
- 130
2
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1
answer
605
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Sonoff basic R3 DIY
I have read through a few blogs and watched videos of setting up the R3. What I have accomplished to date is the following:
Paired the R3 with ewelink cell app. I can turn it on and off from the app.
...
- 121
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36
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Most efficient wlan module for a bunch of rcars
I want to build up a rc car on my own which I can connect/steer via an app - either smartphone or computer. Not decided, yet. I also want to use multiple cars, each for a friend so let's say in the ...
- 101
2
votes
1
answer
378
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Wirelessly Transmit Signal to Smartphone App
I'm looking for a way to wirelessly transmit data to smartphone app. I have a small temperature sensor which will be embedded into a metal structure and will constantly monitor temperature when the ...
0
votes
1
answer
80
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Connect multiple smartphones to single IoT device [closed]
I am new to IoT. I want to connect multiple smartphones (simultaneously) to single IoT device (chipset), wirelessly, but without internet.
I want to turn on/off some electric device (for example, a ...
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200
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How to send GPS coordinates to a SQL database from my GPS+GSM device?
I'm getting ready to start building a simple wireless GPS device. This device will use an arduino, and a cellular GSM module paired with a GPS device (an example is the SIM5320a aka the FONA 3G from ...
- 61
1
vote
1
answer
87
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Suggestion between bluetooth and wifi for a simple sensor reading application
So I have a simple application that involves reading the input over terminal via UART, and then responding accordingly, be it toggling an LED or outputting a sensor reading over I2C. As a step up, I ...
- 111
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vote
2
answers
99
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Problem with UART of Fona 3G from adafruit. (aka SIM5320a)
My issue is fairly simple to describe but I have no idea what the problem could be. So I got my FONA 3G and immediately after taking it out of the box, I connected the battery and I wired up my FTDI ...
- 61
4
votes
1
answer
356
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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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votes
1
answer
51
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Search for a device that uses a mobile sim and that acts on a relay by ringing the sim
I am looking for a device that has an internet connection via a mobile sim. It allows owners of enabled telephone numbers to switch a relay by ringing the device sim.
The system will be used to allow ...
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3
votes
0
answers
412
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Using RPC in IoT environments
I would like to use RPC for communication between fog nodes. As the connection between the nodes is wireless (802.15.4), I don't want to use an RPC framework that uses HTTP (like gRPC).
I know that ...
- 31
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822
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How to take data from multiple BLE devices into a central device simultaneously?
Firstly, I am very beginner in BLE domain. I have very little knowledge about it.
I have Adafruit Feather 32u4 Bluefruit LE module.
I want to do a project where multiple BLE peripheral devices ...
- 121
0
votes
2
answers
98
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Signal Processing in LoRa
I was working with LoRa interfacing with microcontrollers and realized that I'd require encryption of data in my design. Can someone tell me if I would require signal processing for this purpose?
2
votes
1
answer
61
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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 ...
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3
votes
1
answer
58
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Wireless IoT Devices at mm-wave frequencies
The upcoming 5G can be beneficial for IoT in various aspects:
higher data-rates
low latency
better utilization of bandwidth
potential wireless power transfer/harvest
Introduction of mm-waves (28 GHz ...
- 161
1
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0
answers
25
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RF interference for ultra low power wireless device
Is it routine and/or has anyone performed tests on active interference when developing ultra low power wireless devices?
You area going to test range of your device and tune your antenna/matching ...
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4
votes
2
answers
72
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WLAN Hotspot Internet sharing possibilities?
I figure this is the best place to ask.
Many IOT devices need to be connected to a network, and sometimes require Internet access, but not 100% of the time.
Usually it's fine to just connect them to ...
2
votes
0
answers
38
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Industrial programmable radio transceiver
(I hope this kind of questions are tolerated here. Otherwise, please say it in the comment and I will delete the question)
I have to create a wireless network of over 200 devices, placed in the same ...
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vote
1
answer
70
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Remote sensor cloud connection
i'm just starting out in Arduino, IoT etc; I was given the Elgoo Uno R3 Arduino starter kit at the weekend and i've been trying to soak it up.
I would like to make a number of sensors for my van, ...
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3
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2
answers
73
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IoT applications with heavy-load wireless communications
I am very interested in the examples of IoT applications where a heavy-load (for large amounts of data) wireless communications have to be used.
To the best of my knowledge, most IoT devices would ...
- 161
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3
answers
2k
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Send sensor data over internet to a server [closed]
I had a project planned on monitoring sensors. I wanted to read sensor data
over the internet. How should I proceed with the setup?
Any help is appreciated.
- 27
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1
answer
77
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How to differentiate the side of a door?
I would like to design a lock which will automatically open once someone is on a specific side of a door ("outside").
There are easy (software) and complicated (hardware) elements to take into ...
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6
votes
1
answer
907
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How does APN affect cellular connectivity?
We had recently deployed a few Cellular IoT devices on the field, using SIMs from a certain provider (Airtel India). They had provided us with an APN, but we chose not to program our device with the ...
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votes
1
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83
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Sensors for a Validation Research
I've been searching for wireless sensors that could track the following metrics:
Location (GPS)
Heart Rate
Head Movement
Length of Steps
Skin Conductance
Pavement location
(relative location compared ...
- 81
3
votes
1
answer
354
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Why there is no LPWAN technology in HF or VHF band?
This is a question which I have been wondering ever since I started exploring LPWAN technologies.
All the LPWAN technologies I have found (like SigFox, LoRa, Ingenu etc.) work in UHF band (300 - 3,...
- 143
6
votes
1
answer
161
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Send wirelessly very small amount of data
I need to transfer wirelessly a message of maximum 5 bytes of data (including everything such as start bits, stop bits etc etc).
What I tried:
Empty Ethernet package is at least 56 bytes according to ...
- 161
2
votes
0
answers
91
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Sigfox Callback CustomValue's issue Sending NULL instead of wanted values
I'm working on a project, and I want to use a Sigfox callback to send some data.
But when I want separate my payload as I coded it, all my values on Callback are NULL.
This is my Callback, and this ...
4
votes
0
answers
319
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MOXA Modbus with Raspberry Pi – Can't get slave to work
I have two Moxa modbuses that I have daisy-chained together, and then connected to my network's ethernet port. The modbuses are hooked up to a control board with LED lights for the coils and buttons ...
- 253
8
votes
2
answers
306
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Suitable wireless technologies for high density industrial IoT
I have a requirement to design M2M communication devices for a factory which has 1000 nodes (machines) within 100m of each other. The devices will be wired to get power and will transmit a payload of ...
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6
votes
1
answer
112
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Simulation tools for centralized, decentralized, or distributed wireless sensor network
I want to simulate the collision avoidance between different objects that use (IoT based) centralized, decentralized, or distributed wireless sensor network. What are free software available to ...
- 161
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votes
2
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112
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Requirement for a mesh network using Zigbee or similar technology
I have a requirement to design a proprietary monitoring system. (There's some intellectual property involved so I'll describe the system with a slightly altered purpose.) Imagine a large factory ...
- 181
6
votes
1
answer
489
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LTE-M, Cat-M1, maybe MQTT - How is data metered? TCP/IP overhead included?
We're looking at adding an option to our product for Cat-M1 data connectivity. The data plans look interesting, but it's very unclear how the data is actually counted. For example... for these AT&...
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8
votes
1
answer
1k
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How to Use Alexa & Raspberry Pi switch things wirelessly?
I wanted to use my Amazon Echo Dot to connect to my Raspberry Pi, and have it turn on switches wirelessly.
What I have done: I have been able to use Makermusings's Fauxmo and a relay board to "trick"...
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4
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0
answers
92
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Remote control old intercom
My brother has a motor disability and lives in my parents house. He uses an wheelchair and operating the intercom is way too difficult for him.
I was thinking to mount an RF relay switch, but ...
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15
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4
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4k
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Why are Zigbee hardware modules so expensive?
The Zigbee hardware looks quite simple to produce1, why are they so expensive?
For comparison I can get a 855 Mhz wireless module for 2-3€ but I can't find Zigbee modules under 15€.
[1]
- 253
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2
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487
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What is difference between a mote and a microcontroller equipped with sensors and connectivity?
Reading some papers about IoT and Wireless Sensor Networks (WSN) I came across mote devices and have seen there are lots of them.
I have understood that they are the leaves in an IoT system and that ...
- 539
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2
answers
419
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Local and distant MQTT communication
In my project I have a set of sensors in a local network that should communicate with a Raspberry Pi 3 and then with a distant MQTT broker.
Since I'm using ESP8266 for the sensor nodes I thought I ...
- 71
5
votes
1
answer
65
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Secure pairing support in various RF standards
I would like to understand if secure pairing can be implemented in all (or none?) IoT RF standards.
For example: BLE provides Out-of-band possibility, which seems like only really secure option to ...
