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.

learn more… | top users | synonyms

-2
votes
0answers
27 views

Wireless power transmission projects [on hold]

I am second year undergraduate student . I have heard a lot about Wireless power transmission and it intrigues me. I would like to do some project on this. I am not able to find anything good on ...
0
votes
2answers
51 views

Controlling a simple RC vehicle at long dinstace from a PC

I would like to control a simple, ground-based vehicle wirelessly, at ranges up to 5-6 km. The communication would be bi-directional (to get a feedback of "command received") but would only require ...
1
vote
2answers
64 views

Trigger wireless door bell by electrical doorbell

I want to use my electric door bell to trigger a wireless door bell. I replaced the transmit button of the wireless transmitter by a relay and connected it parallel to the speaker of the electric ...
2
votes
3answers
171 views

How can I send one bit one mile with one battery?

This summer I will be attending a large music festival for the second year. I will be going with other people this time, and I'd like to be able to communicate with the other people wirelessly in ...
0
votes
0answers
72 views

Wireless charging through metal

I'm building something at the moment (a vaping mod) and would like to utilize wireless charging, it's approx 1.5mm alloy thick so i need to make some slots/cut some holes but would like to keep these ...
-2
votes
1answer
44 views

Can radios in a router communicate each other [closed]

I am research scholar working in wireless mesh network. I have learned that each mesh router can have multiple radios/interfaces and each radio in turn support multiple channels. For eg:- two radios ...
0
votes
1answer
58 views

How to Calculate maximum distance between transmitter and receiver in wireless communication

how to calculate maximum distance between transmitter and receiver in free space radio communication by having transmitted power, antenna gain and noise-to-signal ratio ?
0
votes
2answers
51 views

What does blocking performance mean in RF transceivers' datasheet?

I have encountered two terms, adjacent channel selectivity (ACS) and blocking performance (BP), in TI cc1120's datasheet (http://www.ti.com/product/cc1120). I found the definition of the former (ACS) ...
0
votes
1answer
70 views

Why can current phones act as Wi-Fi routers, but not as mobile broadband (3G, 4G etc.) routers? [closed]

Many of today's smartphones enable users to share their own internet connection with others via Wi-Fi through tethering. However, from what I understand, current Wi-Fi has much shorter range and ...
0
votes
2answers
58 views

Building a vehicle tracking device

I need to build 100 coach tracking devices. I am a web/mobile programmer, not an engineer, so I'm going to be looking at outsourcing for this. To outsource this work however I should know the ...
1
vote
0answers
50 views

Best transmitter and receiver for the job? [closed]

I am very much an amateur when it comes to this just to warn you. I am trying to build a device which will on the press of a button has a transmitter send a 6 digit code to a receiver, which will ...
0
votes
1answer
47 views

FM receiver used to control a switch

I am new to this and I would like to ask for advice on FM receivers. I want to create a very low powered (mass produced) item that has a super bright LED, battery and then related circuitry(for FM). ...
0
votes
1answer
34 views

What is a channel tap?

In wireless communication, I am confused about what people are referring to when they use the term 'channel tap.' Can someone explain the term or provide me a definition? Any help will be ...
2
votes
2answers
49 views

Does bluetooth implement the 802.11 wireless standard?

I've read that the Bluetooth standard is 802.15, but it is implemented with 802.11. Is this true? Do they interfere with eachother? What standard is Bluetooth considered to use?
0
votes
0answers
45 views

HC-06 Auto Reset

I have a HC-06 Bluetooth Module connected to an Arduino Micro. I've hit a problem, the Bluetooth module doesn't seem to auto reset, after a device has connected and disconnected from it again! I've ...
0
votes
0answers
57 views

in wireless communication why the nodes need to be synchronized

A lot of times I see the authors talk about synchronization. I have seen that "the nodes should be synchronized" so why? I mean we can set all of their timers at the same time? what do happen that ...
4
votes
3answers
248 views

Design of an electronic device to disable remote access ability of contactless payment cards without visible alterations and damage to the card

Question: How could I build an electronic device which disabled the remote interaction functionality of contactless payment cards while not affecting the functions which are accessed via the on-card ...
0
votes
1answer
45 views

Transmitting AV signals one way

I have a video feed that's two AV cables (one sound, one video) and I'm looking to transmit them from the source to about 100-200 meters away. Specifically, I need some sort of transmitter/receiver ...
0
votes
1answer
35 views

standalone Xbee end device / router?

can xbee be used as a standalone device, which can take some input and transfer it to co-ordinator without another microcontroller support? I did find one blog where he used xbee directly programmed ...
0
votes
0answers
27 views

Any parameter other than RSSI in latest wifi standards, which can help estimate distance between wifi AP and endpoint

I have checked and found many references for measuring distance between wifi AP and connected endpoint based on RSSI. But in order to do this, does latest wireless standards produce any parameters ...
1
vote
2answers
45 views

What are the trade-offs of transmission bands?

If I were designing an RF circuit how do I determine what band the circuit should operate on? What are the trade offs? and why is the higher the frequency the lower range? It is quite un-intuitive for ...
5
votes
4answers
737 views

Wireless Home Automation 2.4GHz versus 433MHz [closed]

Project specifications To make some things clear first(wow that sounds so arrogant): This is an Arduino project This is supposed to be internationally applicable I have experience with 433 MHz ...
0
votes
2answers
51 views

HMI for small desktop laboratory equipment

We are building desktop laboratory equipments and wondering whats the next step for HMI from 40x2 Text display and small switches. Idea we are contemplating are... bluetooth in device and android ...
0
votes
4answers
79 views

Will having two antennae at the receiver give better reception?

I have a 300mbps router with two antennae (tp-link td-wd8968). I'm building a PC and looking for a wireless network card. I have seen seen cards with a single antenna (150mbps) and cards with two ...
0
votes
1answer
34 views

Transmitting multiple data streams as one signal to multiple stations

I'm thinking of a system that would take multiple data streams in, encode them into one signal, and then broadcast it out to multiple stations that could then decode the information in the signal for ...
0
votes
1answer
32 views

Low latency rf link

I am working on making a low latency rf link that will be used as part of a feedback loop on a remote sensor. Because it is real-time the delay needs to be as small as possible (if sub milliseconds ...
10
votes
2answers
543 views

How does the plastic-tube inductor in this wireless transmitter work?

This single layer PCB (solder side shown here) is from an old fan remote: The inductor in the plastic tube is not connected physically to any components; however, the two loops of wire surrounding ...
1
vote
3answers
63 views

Determining distance between wireless sensors - sailing project

I'm looking for a solution which will allow me to determine the distance between two points, one of which is static and the other not. It's part of a project I'm working on which will involve the ...
3
votes
3answers
132 views

Suggestions on instruments to detect pachyderms

I am doing a project to detect the pachyderms in the forests when they cross the borders. Now is there is any other way other than seismic or sound waves to detect the pachyderms before they cross a ...
0
votes
0answers
61 views

Compare EMF Strength

My mother is extremely sensitive to EMFs (Electromagnetic Hypersensitivity), and I want to help her by turning off Wi-Fi in the house and using some Powerline adapters to replace the Wi-Fi network. ...
0
votes
2answers
49 views

Peak-to-peak voltage of WRL-10534?

I'm experimenting with the 434 MHz RF Link transmitter (WRL-10534) from SparkFun. I'd like to determine the peak-to-peak voltage of the RF output, but I don't have access to an oscilloscope that can ...
0
votes
1answer
38 views

Bit error rate objectives

When designing a transmission link, are there any standardized/typical objectives for maximum bit error rate? Apart from some papers speaking about values like \$10^{-10}\$ or \$10^{-12}\$ for optical ...
0
votes
4answers
99 views

Circuit Validity

The following is a circuit I have tried simulating on multisim. The LED on the transmitter part does not light up. The current is 0 through that LED. Is it legitimate?
1
vote
1answer
52 views

Power output needed to go through a car

I need to know the power output needed for transmitter if I want that receiver catch this signal? In details, there is a tunnel 4 by 4 meters and a cars in it, cars have a receiver inside and ...
0
votes
1answer
40 views

Measuring Stride distance wirelessly

I'm trying to fit two sensors in a shoe each (such that each shoe has one sensor). their purpose being to calculate the stride length of a person, as a person takes a stride, the distance between two ...
1
vote
1answer
69 views

40% Channel Utilization on 1Mb Satellite

Using the Slide Window technique, consider a satellite channel with: 500 byte frames sends 270 ms delay on send and receive 1 Mbps rate communication protocol is Sliding-windows Ignore the length ...
1
vote
2answers
154 views

Recreating a missing wireless keyboard dongle with NRF24L01

I have found an old Logitech Wireless Keyboard (specifically, the MK250 model), which was originally sold with a separated "standard" 2.4Ghz receiver dongle (Not 'Unifying', as written here). I assume ...
0
votes
0answers
61 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
1
vote
1answer
52 views

Wireless transmission power for multiple receivers

I have just started learning about wireless systems and for some reason I'm hung up on what I feel is a fundamental idea. Consider some transmitter-receiver pair with isotropic antennas. The receiver ...
2
votes
2answers
87 views

Inductive wireless mobile charger circuit

In wireless mobile charging circuit, is there any formula of spacing which varifies that by increasing diameter and turns, spacing (range) can be increased?
1
vote
1answer
99 views

EM MWD Gap Sub Telemetry Theory Explanation in Drilling Applications

I have been doing an extensive amount of reading on EM (Electromagnetic) Telemetry in MWD (Measurement While Drilling) applications. From my reading, there are a few considerable gaps in my ...
0
votes
0answers
19 views

Variance of background thermal noise wireless communications?

I am new to this forum and hope I can get some help. I have been reading a paper on wireless communications, in this paper a base station with power P=25 is serving a certain user. The user is ...
0
votes
1answer
127 views

Need 3-axis wireless gyroscope/accelerometer.

So I would like to have a sensor that can detect rotation (around the vertical axis only is needed) and that detects motion (no specific direction, only be able to detect if the sensor is moving). I ...
1
vote
2answers
114 views

square wave carrier signal

I am having some trouble to put things together into one picture. Can a modulated carrier wave be a square wave? If yes then How? Because at resonant frequency at the transmitter, the current ...
0
votes
3answers
149 views

How to increase range of zigbee?

I have a Zigbee Pro with Arduino whose range is 2 miles as per specifications. But practically its maximum range is only 200 meters. I am using XCTU software. Is there any setting/configuration in ...
0
votes
0answers
38 views

Receiver effciency when using DFLL instead of PLL

I have a small doubt! How tolerant are industrial standard receiver chip to phase and frequency error. I bring it out because while designing a transmitter, I want to use DFLL instead of PLL to reduce ...
2
votes
1answer
93 views

Receiver understanding FSK bandwidth

I have a small doubt in a one way wireless communication. If I am using a receiver chip to demodulate an FSK signal. How does the receiver understands, which frequency to listen to? For example, I ...
0
votes
0answers
34 views

Does BLE allow same device be GAP observer and GATT slave?

I am making a sensor-actuator system connected via BLE. The sensor is a GAP broadcaster and the actuator is a GAP observer(central device). The actuator perform action based on broadcaster information ...
0
votes
0answers
66 views

programming JN5168

Where can I find documentation for JN5168. I am thinking of buying this module but I didn't find anything which can help in programming though the datasheet of module has almost all features which I ...
1
vote
2answers
99 views

How to start LED wirelessly in a very compact and cheap module?

I have been thinking and researching about this issue for a while with no success. I am hoping someone can solve this problem in the community. I want to have many small modules each with a small ...