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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63 views

Building a Generic Wireless USB Device [closed]

I'm trying to (re)learn STM32 MCU programming in C/C++ by doing a pet project. My goal is to build a generic framework for making wireless USB devices (e.g. keyboard, joystick, etc.). To a degree, I ...
-5
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0answers
48 views

Is there any available Wireless Communciation which can communicate in microseconds [closed]

I was reading a survey, and stumbled upon a table where the author suggested that communication between two parties happens or should in a matter of microseconds. Is that possible at all, I am not ...
2
votes
1answer
57 views

Can Bluetooth beacon be detected while it's in motion?

I'm curious to know if smartphones can actually detect Bluetooth beacon which is in motion, say while driving. Can car A detects the beacon in car B if they pass each other? If yes, what is the speed ...
1
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2answers
43 views

Can I reposition the induction coil in a Qi charger

I have recently bought a Qi wireless charging case for my phone as a car mount that I was bought for Christmas had a Qi charger build into it. Both work well, but are the coils are misaligned by about ...
0
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0answers
23 views

Interfacing two BLE devices with no UI

I'm wondering what the best way to connect/pair two BLE devices which have no screen. Most applications with BLE use a smartphone, tablet, or computer as the central device, and in these cases it is ...
6
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2answers
291 views

Wireless communication under water

I am looking for a under water wireless communication, distance up to 3000 meters. For this I quickly did some research on it and found out that Acoustic communication would be the best solution since ...
2
votes
2answers
257 views

Wireless data exchange up to 2bytes/s

I would like to setup a communication between two arduino with a distance of 20cm but not more than 40cm. I looked for the RFID solution. I found a lot of PCB wich can be used to read and write to the ...
0
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1answer
56 views

Does Bluetooth 4 or 802.11b/g/n penetrate through walls better?

I'm thinking of building a signal beacon designed to be used indoors. The transfer speed isn't critical but range and penetrative ability are. Does anyone know if Bluetooth 4 or 802.11b/g/n might be ...
3
votes
2answers
114 views

How Channelization code is shared in HSDPA?

I am on my way to understand the HSDPA/HSUPA technologies. I have just started and came upon the topic of channelization code. I learned how these codes are generated - Hadamard code technique - and ...
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0answers
34 views

Why does this smart card use antenna with different space between turns along different sides?

I've extracted and zoomed to 400 percent parts of image from this post. The original image features the inner parts of Visa PayWave enabled smart card. Here're card corners zoomed to 400 percent so ...
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0answers
28 views

Bluetooth serial to bluetooth audio module

I was looking to work with a bluetooth audio module but many of the available options are either very costly, unavailable in my region(India) or generally lack some features. What is commonly and ...
0
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0answers
10 views

The transmitter address is different from the AP to which my station is associated. Will this cause a problem?

Assume that this is a necessary evil for the moment, due to cases such as a broadcase frame being sent out by an AP with many virtual access points. Does it ignore the frame? Will it accept and ...
0
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0answers
26 views

How do I sniff packets with a Zulu chip based on Si1000?

Tried to ask the question in another SE but was directed here. I'm trying to sniff the communication between Z-Wave devices. I've set up a "smart home" consisting of a few devices using Z-Wave ...
1
vote
1answer
70 views

XBee Synchronization

I am using 64 XBee modules (XB24-Z7UIT-004) as sensors and I am trying to synchronize all the modules to execute a command all at the same time. What happens is that it takes about 500ms to send the ...
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2answers
54 views
0
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1answer
40 views

What is the speed of a baud rate? - RN42

After wondering/researching about this for days, I finally ask this question: What is the speed (bits per second) of a bluetooth SPP RN-42 device? Is 1 baud = 1 bit (thus 9600 baud = 9600 bits per ...
0
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0answers
20 views

RFBee corrupted, not working

I was working on multiple RFBees, 1 receiver node and 4 sending nodes and, sending data at a very low packet interval of 30ms [Duration between each packet sent from a node]. I sent around 2000 ...
1
vote
1answer
69 views

How do you implement wifi with a front-end chip?

I was looking around for a solution to hook up an application with an MCU to a wifi network. I'm basically looking for a chip that can talk to my MCU via an interface like I2C or SPI and is able to ...
0
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0answers
17 views

Wireless Gyro Data

I have a rotor that will be spinning at rotational speeds up to 500rpm for short periods of time, say, 5 seconds each. I'd like to attach a gyro to the rotor and transmit data wirelessly - ultimately ...
4
votes
3answers
144 views

Possibility of an extremely directional antenna

I'm fairly new to RF technology, but a direction-finding application has come up where a highly directional antenna can offer a convenient solution, so I started searching for such antennas. Most, ...
0
votes
1answer
38 views

TI RF solution - MSP43x+CC1100 vs. CC1110, toolchain

I'm looking for low-power RF solution working in sub 1GHz band (868MHz, battery powered, mostly sleeping). Originally I considered AVR with Digi Xbee 868LP module but doing deeper research I found TI ...
1
vote
2answers
70 views

I want to send and receive data wirelessly from 90 different areas to a central collection site. longest distance is 8.5 miles.

I have 90 pump/lift stations that I would like to send information from to a central collection place (office). The longest distance is 8.5 miles away. most of these pump stations are line of sight ...
0
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0answers
21 views

Q: FCC/EC pre-certification: is it required for evaluation/development kit?

I would like to add a wireless (Sub 1-Ghz or 2.4Ghz-based) connectivity option to an development kit and wondering if FC, EC, and alternative certifications are necessary for this add-ons. As far as ...
0
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0answers
24 views

XBee Pro 900 RPSMA not detecting

I bought 2 XBee Pro 900 RPSMA from Sparkfun.One of them is detected by XCTU but same other one is not detected by XCTU. so I tried recover faultly one by seeing this video ...
2
votes
1answer
25 views

Impact on the battery life of a wireless mouse based on a using practice [closed]

While using a wireless mouse having alkaline batteries, does it matter to the life of batteries, at what distance from my computer I use it? I mean, if I use the wireless mouse from a far distance ...
0
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0answers
44 views

What's the purpose of these peninsula-like areas in this smart card circuit?

Here's a scan of a stripped MIFARE Ultralight smart card. Note the underlined peninsula-like areas. They are simply connected from one end to the antenna track. They don't look like a patch antenna ...
5
votes
2answers
70 views

Why is outer turn of this smart card antenna wider than the other turns?

Here's a scan of a stripped MIFARE Ultralight smart card. Most of the wiring is the antenna which effectively consists of a single spiral track. The outer spiral turn clearly is a bit wider than the ...
1
vote
1answer
60 views

Reliable way to transport data over 1-2 km distance

I am looking for some way to transport data (around 3000Kbps) omnidirectional. Transmitter should not weight more than 300 grams but receiver can be much heavier. The range I am trying to achieve is ...
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votes
1answer
199 views

Can a Bluetooth wireless connection bridge a USB Host and USB device?

Now that Bluetooth modules are dirt cheap, I'm wondering if I could make a pair of wirelessly connected objects that would act as a "virtual USB cable". One would have a pig tail with a USB Male plug ...
1
vote
1answer
38 views

FSK combined with either ASK or PSK?

Why is it that we are able to combine Amplitude and Phase modulation (Resulting in QAM) but are not able to do so with frequency? Why not combine all three degrees of freedom (Amplitude, Frequency, ...
0
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3answers
79 views

Transmit an internet connection over wireless

My target is to transmit an internet connection (8 Mbit/s) over long range wireless RF (7.7 km) with LOS (Line Of Sight). I live in a country where there is no rules for RF transmission, so i can use ...
0
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1answer
130 views

Is moving fast will effect WiFi transceiving beavior?

Let's say I'm driving a 2010 Bugatti Veyron 16.4 Super Sport, with speed of 431 km/h = 268 m/h = 119 m/s Now I have a WiFi signal receiver installed on the top of the car and a WiFi transmitter in ...
1
vote
1answer
64 views

Transmit 12v power wirelessly

Is it in any way feasible, in a small form, to power a 12v light with a power source or transition source 3" away without any physical connection? ...
0
votes
1answer
54 views

Choosing a RJ45 to WIFI adapater for use with Embedded Server

I wanted to build the classic web page that turns on and off an L.E.D. My plan was to use one of the Atmega line of micro-controllers with an enc28j60, which seems to be a popular solution to this ...
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0answers
49 views

Recommendation for proper relay to trigger wired doorbell with wireless intercom

I was just searching my question and found someone on here recently asked this question: I am looking to do exactly the OPPOSITE of this. I would like to use the pushbutton of a wireless ...
0
votes
0answers
30 views

About bluetooth 4.0 modules auto connect

I am new to Bluetooth 4.0 cc2541 modules with pins and baseboard. I am currently working on bluetooth 4.0 modules with the STM32F407VG for the wireless robot controllers which is my final year ...
1
vote
1answer
72 views

Interfacing a GPRS chip (WISMO218) with an RF antenna. Calculating line width for the right impedance

I want to interface the WISMO218 GPRS chip with an antenna. The antenna lines on the PCB board have to be very specific, otherwise the system won't work. I have uploaded the part of the datasheet that ...
1
vote
3answers
89 views

Dipoles lengths underwater vs on land

A submarine (for example) uses a VLF communications system to remain in contact with its headquarters while submerged. The submarine drags a resonant dipole wire antenna behind it in the water. The ...
1
vote
1answer
65 views

Wireless Panic Alarm

I have made a panic button with a simple circuit with a wireless doorbell button connected wirelessly to the chiming box with the output of that connected to a relay powering a 12v flasher and siren, ...
0
votes
0answers
31 views

How do I use the XStream RF module for serial data communication with a BeagleBone Black?

I am currently part of a car team and we needed a minimum 2.5 mile range wireless system which would communicate the sensor values(Battery voltage, current etc.) to the ground station via a radio. ...
1
vote
1answer
298 views

Shallow underwater wireless sensor network

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
2
votes
3answers
175 views

Wireless Power Transfer at 50Hz

Is is possible to transmit power using magnetic resonance coupling at 50Hz? Assuming I have no constraints on the minimum distance between the primary and the secondary coil. However, the coils are to ...
2
votes
1answer
126 views

Why 802.11g has a maximum throughput of 54mbps?

Can anyone explain why the maximum throughput of the IEEE 802.11g standard has a maximum throughput of 54mbps I can not find that. I would like to know how do you get this 54 taking into account the ...
0
votes
0answers
23 views

Wireless communication LTE question

This question is regarding LTE PHY layer. If anyone is expert at this I would very much appreciate you helping me out. I am having trouble understanding what physical channels and transport channels ...
1
vote
3answers
144 views

FCC certification for nrf24l01+

Is nrf24l01+ from Nordic Semiconductors FCC certified ? It is hard to find out from their datasheet whether FCC approved ? Is it FCC approved ? If it is approved and I use it in my PCB and control it ...
1
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0answers
30 views

Compression and communication power consumption trade-offs

Let's say I'd like to save battery power consumption when sending data to remote devices connected wirelessly, i.e., sensor networks. One of the ideas may be compressing the data to reduce the number ...
0
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0answers
95 views

Best way to send a simple digital signal wirelessly (close-range)?

I have a small device which powers two vibrating motors. I would like the vibrating motors to be wireless (ie, not actually connected to the device). Here's some more info: Here's the vibrating ...
1
vote
0answers
65 views

Converting USB webcam to wireless

I have a PC workstation and a usb camera installed about 5m away. There is power available at the camera but the USB port is now broken. It is prohibitively expensive to replace as it is installed ...
0
votes
1answer
39 views

wireless sensor baud rate calculation

I need to calculate baud rate of wireless sensor which operates on 433.92Mhz and uses OOK modulation. Signal wave form and packet structure are known. Packet = 36bit (44.7ms), each bit consists of 2 ...
0
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0answers
151 views

Is wireless power transfer by induction at 60Hz possible, or does the frequency need to be changed?

I want to build a wireless power transmitter that works over a very short distance. Can I use my line voltage(120V at 60Hz) through the primary coil to induce voltage into a secondary coil about 1/4" ...