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Questions tagged [wireless]

Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (radio-frequent). Distances can be as low as centimeters (e.g. RFID), there's no upper limit.

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0answers
31 views

Transmitting Electrode Signals to Arduino? [on hold]

I have recently made a DIY EEG and the way that is functions is by taking two signals from electrodes and amplifying it through an electrical piece called AD620AN, in addition to using a ground ...
0
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1answer
35 views

How To Fix A Mouse Receiver [on hold]

My wireless mouse was working fine in the morning.Then I just travelled to somewhere else with my mouse and laptop which were in a backpack.After I start my laptop,I tried to use my mouse.But it wasn'...
0
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2answers
53 views

Is it possible to induce negative/positive charge wirelessly

Sorry if this question doesnt belong here. I have no clue of what I'm about to ask. I want to know, if possible, how to induce negative/positive charge on objects inside recipients? What I want to ...
0
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0answers
24 views

Wireless Switch [closed]

The switches of the lights of an area are far from that area. I was wondering how to set up wireless switches that can work in a distance of nearly 30 meters from the original panel(switches). (They ...
0
votes
1answer
32 views

Trying to read the data from an ASK RF transmitter

I'm trying to duplicate the operation of a simple RF remote control (for some remote power outlets). In the remote control there is an unmarked 8-pin microcontroller. I've worked out which pins are ...
0
votes
2answers
125 views

Why aren't tethered balloons used instead of Cellphone towers? [closed]

If we use tethered balloons with wireless gateways fitted on them (let's say for Cellular or LPWAN communication), they can provide much more coverage. Why aren't they used then? While there are many ...
0
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0answers
16 views

What is the purpose of Gamma distribution in Nakagami-m fading wireless channel?

A gamma distribution is a general type of statistical distribution that is related to the beta distribution and arises naturally in processes for which the waiting times between Poisson distributed ...
0
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1answer
33 views

Antenna polarization and antenna directivity are the same?

I'm working on an RFID project, and looking for information about the antennas that I have to use, I have the following doubt: Antenna polarization and antenna directiivity are the same? Thanks!
-3
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1answer
44 views

how rubber keypad works [closed]

Press on the keyboard, how does he connect the circuit of this key? Two thin films, coated with conductive rubber circuit, with a thin film in the middle, with holes, used to isolate two thin films ...
0
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1answer
34 views

Wireless LAN standard

I'm taking a module on wireless design and we were told that the IEEE 802.11b standard has a band of 2.4 to 2.4835 GHz and that it is divided into 13 channels. Now, my question is, does that mean that ...
0
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0answers
16 views

How to get the RSSI value from an Xbee?

How do you make XBee send its RSSI value to another XBee? My goal is distance measurement and position estimation in an outdoor environment. The distance is calculated from the RSSI values.
0
votes
1answer
47 views

Creating a wireless transmitter/receiver for off-the-shelf siren

Since I oddly enough haven't been able to find a suitable off-the-shelf product that's reasonable priced (less than 50-60 EUR/USD) and somewhat good looking with Google, I'm about to try a small ...
1
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2answers
32 views

Optimizing magnetic field force of a coil

For a personal project, I've done a redesign of Samy Kamkar's MagSpoof project. Basically, it is possible to use an electromagnet, h-bridge, and microcontroller to trick a magnetic card reader into ...
0
votes
1answer
40 views

Radio activated on/off switch

TL;DR: I want to know if there is anything, That on which when a radio frequency falls, and it turns on an LED. Basically an on off switch but controlled when radio waves hit it. What I hope to ...
-1
votes
2answers
49 views

Should the antenna be 'better' for the transmitter or receiver?

I intend for this to be a general/conceptual question that could apply to any wireless communication setup, however I will use a specific example to make things easier. For my example, I'll be ...
0
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0answers
73 views

Long distance internet connections

My friends and I are PC enthusiasts and we are making a NAS, unfortunately we live in a suburb of Melbourne, Australia and internet here is garbage (lower than 8 megabits most of the time) so this is ...
0
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2answers
153 views

Name of an electronic component

Can anybody kindly tell me what this electronic component in the picture is called? I've seen this component in: Mobile phone circuit WiMax modem circuit GSM Module circuit I tried but was unable ...
0
votes
1answer
22 views

SAW Filter input power restriction

I have front end module (915MHz freq band) in circuit Which is having 30dBm output power. Between This FEM and antenna I have to insert filtering circuit. I came across few SAW filters from Murata, ...
0
votes
2answers
62 views

Can you turn two inductively coupled conductors into a transformer?

So I'm working on a school project, and to be honest. Don't know a lot about electromagnetism. I want to make a wireless charging station that could be plugged into the outlet. Of course I don't want ...
0
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0answers
22 views

Wifi/BT on Realtek 8723 - Is FCC, CE certification needed for Wifi if we disable Wifi and use only Bluetooth?

I'm planning on importing a generic mini pc that comes with an onboard Realtek 8723 for Wifi and Bluetooth. We will need to get it FCC, CE, IC certified before we sell it in North America/EU. Getting ...
0
votes
1answer
31 views

Setting Up Long Distance Unidirectional Wifi Antenna

A neighbor has graciously offered us temporary access to their wireless for basic internet access, but we are about 100 meters apart. I have a wireless NIC, but I wanted suggestions as to the setup. ...
2
votes
1answer
136 views

why do resonant inductive coupling circuit operate at high frequencies?

Just as the title says. Whenever I read a research paper on wireless power transfer via resonant inductive coupling the authors just mention frequencies that range in the kHz and Mhz range, but none ...
-2
votes
1answer
32 views

What is the basic concept (philosophy) behind the modelling of Nakagami-m fading wireless channel

I understand that that NAKAGAMI-m probability density functions that describes the random behavior of signal in a wireless channel. But I am very confused about one thing, by what concept did these ...
1
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0answers
55 views

difference between ISO 14443 vs ISO 18092 and collision detection

I have been studying about contactless payment specifications and protocols and I have few questions about them. Are ISO-14443 and ISO-18092 called NFC and RFID in general terms, or are they a ...
0
votes
1answer
42 views

Wireless power through air [duplicate]

I know this might be far fetched. In normal everyday life, we have huge amounts of data traveling through the air in the form of electromagnetic radiation. But what if instead of transmitter data ...
0
votes
1answer
35 views

Locating mobiles/UE by base stations in a cellular system [closed]

After understanding a bit about how actual cellular systems function, I realized that identifying the mobile/UE location is key in assigning the UE to correct base station and thus to guarantee a ...
1
vote
1answer
76 views

Transmitter and Receiver antennas in mobile phones

I understand that in old cellular systems where FDD were employed, we used to have same antenna at the mobile phone (User equipment) for transmission and reception.Moreover, a duplexer was used to ...
1
vote
1answer
87 views

Analog beamforming vs digital beamforming

I am reading some research articles on wireless communication where they talk about beamforming techniques and their differences in Multiple antenna Tx-Rx systems (MIMO). It says analog beamforming ...
0
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0answers
28 views

PIC18F4685 problem reading an input from a HT12D

I am using a PIC18F4685, 4 Digit 7 Segment, 433 MHz RX(super-het) and TX, Hall Effect Sensor, HT12D and HT12E. My setup is TX Side... Hall effect sensor is connected to D11 (PIN12), 5V and GND. HT12E ...
0
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0answers
11 views

What will be Directional antenna gain formula, encompassing all lobes?

In the attached figure, one can find the antenna gain formula. But the authors have simplified it for the main lobe only. Can someone please let me know the exact form of the following simplified ...
0
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0answers
20 views

About Directional Antenna, Transmit Gain, and Rician fading

In my research, I assumed a directional antenna for the indoor environment. I took the approach of considering Rician fading channel b/w Transmitter \$T_x\$ and Receiver \$R_x\$. My received power is ...
0
votes
1answer
26 views

Finding success probability for wireless channels

This seems a very dummy question, but I cannot figure out how the following equation has been solved by authors: $$P_{secure} = \text{Pr}\{\epsilon cP_sd_{su_i}^{-n}|h_{su_i}|^2> cP_sd_{se_i}^{-n}|...
0
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1answer
38 views

LoRa modulation and chirp process clarification

I am new to LoRa and I would like to get some confusion on chirp-based modulation process clarified. I was reading the very good thread Understanding the relationship between LoRa chips, chirps, ...
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1answer
58 views

Are watts consumed in wireless electricity? [closed]

If I put a transistor on a coil of wire connected to a 120v AC circuit, and made it so my toaster was now wirelessly powered, if I turned the toaster on would it consume watts that are able to be ...
1
vote
1answer
59 views

Alternative wireless technology for passive RFID tags

I am working on a project where I have 3 boxes and a RFID reader (mfrc522) attached at the bottom of each box. I keep my wallet/keys/etc in these boxes and a LCD screen displays what is in each box ...
1
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3answers
149 views

Methods for confirming on both sides that a signal was received in one direction

Say there are two devices (A & B) that talk to each other (full duplex). For the sake of this example, let's say the medium is RF (wireless). If device A sends a message to device B, what ...
1
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1answer
108 views

Fast, cheap, wireless data transmission with Raspberry Pi [closed]

I need some advice on a project. I want to wirelessly transmit packets of data from a Raspberry Pi to several microcontrollers (Arduino or other). The frequency must be at least 15 packets/s per ...
15
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3answers
4k views

Why does WiFi have a shorter range than LTE? [closed]

It seems confusing that my phone receives -87 dbm LTE signal and shows a full 4 bars with the speeds of UPLOAD: 20Mbps DOWNLOAD:13.6Mbps But my WiFi is showing 1 bar at -89 dbm and I get ...
2
votes
1answer
116 views

Can’t get simple LoRa receiver to work

I’m in the process of attempting to create a very simple, small, LoRa sensor based on an sx1276 module and an ATmega328P. My ATmega328p is communicating with the sx1276 module happily, but I can’t ...
0
votes
1answer
66 views

How can I measure my smartphone transmitted power? [closed]

I was wondering if I can measure my phone's transmitted power with an SDR by tunning in the transmission bandwidth but then, I'm not sure how to know whether this power is coming out of my phone or it'...
0
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0answers
43 views

What is the difference between Antenna port and Physical Antenna in LTE?

I have just started working on the 5G NR physical layer and I have difficulty understanding the concept of Antenna Port at the downlink. In release 10 there supposedly 15-22 antenna ports for CSIRS (...
1
vote
2answers
81 views

RF range at 169 Mhz

I'm planning a sensor network for agriculture (that apparently doesn't exist yet in this form) and I'd like to understand the possibilities of the radio link. A good number of in-the-field soil ...
0
votes
2answers
92 views

Cheap Low Power Signal Transmission To Smartphone

For my university project I'm making a certain sensor which has to (one-way) communicate with a smartphone. The sensor needs to be as cheap/simple as possible (aiming at +- €0,50 in total) and only ...
0
votes
1answer
42 views

relay control with network and sms with main controller [closed]

I need this project for a melting plant. There must be two relays in the control (connected to the device), so if one of them is in trouble, another will work to disconnect. In the (current check) ...
0
votes
2answers
92 views

What software use to hack wireless protocol ( logic analyze ) USBee

Q: What software do you use for logic analyze? Why: I try to hack(reverse engineering) my home wireless heating system control to make my own central control unit. Wireless: My heating system uses ...
2
votes
2answers
63 views

Keyboard wireless feedback from computer

This is a theoretical question. I want to ask, is the the modern keyboards communicate with PC such as wireless keyboards can 'get/read' some data from the PC? If not, what do I need to do for that? I ...
-5
votes
1answer
66 views

Wireless communication [closed]

We are planning on making a wearable device for a group of ~40 people. What we would love to get some input on what kind of wireless technology is best fitted given the following requirements: The ...
0
votes
1answer
45 views

Can this ESP wifi board's firmware be rewritten?

I'm new to all this node mcu thing. I'm searching for relay shields because they're ready and well soldered, so I can put them into my light switches with no effort. I've found this pack which ...
2
votes
2answers
779 views

Question about sentence in application note: “incremented modulo-256”. Request explanation and clarification

Context: I am reading an application note for a UWB transceiver. In it they are describing the typical message frame format, in accordance with IEEE rules. There is some wording that is confusing me ...
0
votes
1answer
40 views

Nrf24l01 module works on breadboard but not on pcb

After using a breadboarded nrf24l01 for more than a year, I decided to shrink it and have it on a pcb using the wiring diagram exactly used in the breadboard. I am attaching the pictures of the first ...