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.
0
votes
1answer
128 views
What kind of Transmitter and receiver would I need? [closed]
I am trying to figure out exactly what it is I am needing, I am wanting to protect my chickens from my dog killing them! I want to place a small transmitter onto a leg band which will be placed ...
0
votes
1answer
67 views
Calculating the model complexity for wireless sensors
I am coming from geoinformatic background and I do not know anything about the electrical issues.
I have a model for outlier detection for wireless sensor and I want to assess the energy complexity ...
5
votes
2answers
75 views
Antenna Design Filtering Out UnWanted Frequencies
I was wondering if someone could explain to someone with no electrical engineering background where would one place the resonator whose sole responsibility is to amplify sine waves at a particular ...
1
vote
3answers
2k views
Simplest Way to Connect an Arduino to Android (Wirelessly)?
I want to control a simple Light on an Arduino from my Android. The Arduino I have down pat, no problem. However without using Bluetooth on my Android, whats the simplest way to actually connect it ...
-1
votes
1answer
88 views
Mapping of TDMA frame on to E1 frame
In a GSM network TDMA frame is used to transmit information between Base station and Mobile staton and E1 frame is used as the media to carry information to and in the Backhaul. How is th TDMA frame ...
-2
votes
1answer
94 views
Need suggestions for amaster thesis on wireless sensor systems [closed]
I am going to write my master thesis on a wireless sensor network for a fire security system. The wireless protocol is decided and confidential, and has mesh capabilities for redundancy and great ...
-3
votes
1answer
194 views
difference between voice and data services?
What is the difference between the voice and date services. I have read that for voice services T1/E1 frame is used and for data services a frame with a standard header and payload nd tail is used ...
1
vote
1answer
214 views
how much bandwidth does a phone call require and how much is the capacity of a single E1?
How much is the bandwisth requirement for a phone call connection? Considering a non-channelized 1 with 32 time slots how many calls can an E1 support?
Say its 'n'. Does that mean n+1 call will not ...
1
vote
1answer
81 views
Antenna Array Solid Angle
I am currently trying to design, in theory, a large wireless power spot beaming antenna for a satellite to transfer 200 MW at a wavelength of 116 mm. I was wondering how I could design it so that a ...
1
vote
0answers
126 views
why xbee communication is not done | pic18f4520
Why xbee communication is not satisfied, I do not understand. The reason is like complicated. Can you help me ?
I have send data as ;
TXREG = 'e';
I have xbee ...
0
votes
1answer
90 views
Bluetooth Interference between piconets
I am developing a device that consists of a base station and several wireless sensor nodes. In application there may be up to 30 of these devices in a laboratory with up to 5 sensor nodes ...
6
votes
1answer
270 views
Bluetooth vs Bluetooth Smart (Low Energy)
Im trying to decide between Bluetooth and Bluetooth LE. My device needs to transfer 375 bytes per second. Bluetooth LE can send packets of 20 bytes max, so this boils down to about 20 packets per ...
1
vote
0answers
76 views
What would I need for this wireless transceiver setup?
I'm a software engineer, and I'm not familiar with hardware at all. Right now I'm working on something that requires (hopefully) very simple hardware.
All I want to do is be able to send a signal ...
2
votes
2answers
169 views
Options to send an ID signal
I want to make a device that, with a press of a button, will send an ID signal, wirelessly, to some other device. It has to have:
10m range (~30 feet)
<2ms response time (from the press of the ...
1
vote
4answers
238 views
Microcontroller with rotary encoder and bluetooth capabilities [closed]
I am looking for advice on (what to use/how to make) a rotary encoder that I can connect to through bluetooth. I am writing an app that needs to display on screen in real time to the user the number ...
-1
votes
2answers
792 views
Bluetooth Wireless Audio Module (V3.0/V4.0) for us audio interested laymans? [closed]
Hope I'm right asking my question here.
I'm building myself a boombox with wireless audio transmission.
With as of introduction of the iPhone 4S Apple gadgets (and obviously others) nowdays have ...
6
votes
3answers
456 views
What is the most accurate and cheap way to figure out the distance between two points electronically?
For a project, I have an idea that involves getting a position for a person throughout a house. I am trying to figure out someway of triangulating the person's position, by having a bunch of little ...
-2
votes
2answers
74 views
Is an analogue repetition a feasible/desirable novel technique for reducing latency in an OFDM link-based dense mesh network [closed]
In order to minimize latency across multiple hops in a (OFDM) wireless mesh network, the ability to simply pass-on a wireless signal without full demodulation and remodulation could eliminate ...
1
vote
1answer
87 views
zigbee communication
I am trying to communicate two xbee version 2, one of them coordinator and the other is end point xbee.
I have tried to write two functions namely receive and transmit.
...
3
votes
1answer
104 views
Passive UMTS antenna
I'm the owner of an old 2nd world war bunker. To imagine it, a short overview: Imagine they drilled 50 meters into a mountain, then drilled out a big hall, in which they built a regular building. It ...
2
votes
2answers
189 views
technology to search small objects like pendrive, key-chains etc
I am a web developer by profession. few days back I lost 8gb pen-drive :( I don't it is in home or somewhere else.... So now I am thinking of a device which can be attached with small objects so that ...
1
vote
1answer
125 views
Is it possible to detect a transmitter that comes within a certan range? [closed]
I know nothing of electronics. My experience is with software engineering, not electronic engineering. This is a "Is it possible?" type question. If it isn't possible, where are the barriers?
I'm ...
2
votes
2answers
1k views
Home Automation using Arduino and Android
I have been doing home automation for my home using Arduino and Android. I have been able to control the device through WiFi successfully.
Here is the scenario.
Since all the appliance that I ...
3
votes
1answer
873 views
Are there any RF remote control circuits without any ICs?
I'm currently trying to make a simple 3 channels RF remote control circuit but without any ICs or micro-controller. I'm Googling but it seems to not populate (useful results). Does anyone have ideas?
1
vote
0answers
17 views
How to choose the right premble time, acknowledgement time as a percentage of total cycle time in X-MAC Protocol in 802.15.4
I am working on an analytic model for X-MAC, I came across some important duration and I am confused how to select them.
cycle_length = one complete cycle (per transmission) in ms
...
1
vote
2answers
299 views
Serial / UART to Bluetooth module [closed]
Im searching for a very cheap/simple UART to Bluetooth (LE) module, but all I can find are modules like the BlueGiga BLE112, which seems like complete overkill (USB, GPIOs, ADCs, etc). I also came ...
1
vote
1answer
220 views
Arduino with multiple LEDs and timers
I'm working on creating a wireless interval timer with an Arduino, is there a specific Arduino board required that can work with multiple LEDs and give me the programming capability for providing ...
3
votes
1answer
79 views
how to tag and find objects using wireless technology
I am not sure if this is the right forum for this question, If not please help me move it to the right place :)
Question: I have 10-20 items like tables / books in a room and I want to put a small ...
0
votes
1answer
137 views
Spot beam (Coverage area) and beam width [closed]
Spot beam is simply a manifestation of my simulation model. It says that given a certain azimuth angle and an elevation angle, then what is the area of circle in space at a distance R away from the ...
2
votes
1answer
101 views
anyone knows miniature wireless system with data rate >= 2000 Hz?
I am currently using TS7250 board from "embeddedarm" for my sensor and having it set up at 30 KHz for data rate. However, the board is too big for my current application. Can anyone recommend another ...
-1
votes
2answers
50 views
Where are factory default setting stored in a wireless module?
In almost all devices we find "Restore To default factory settings" option available. If factory settings are done all the data in the device is erased. So where are these factory setting details ...
0
votes
0answers
322 views
Wireless Communication core concepts based on the NRF24 libary for Arduino
Well as you may know, there is an amazing libary for arduino called NRF24, used to control Nrf24l01 devices, at the momment I already tried all the examples included, and even made some modifications.
...
-1
votes
1answer
97 views
VoIP handheld device with secure point-to-point communication over WiFi [closed]
All hams on deck!
Bad joke aside, I'm in need of some suggestions. I'm working on a project and have hit a wall. I'm designing a solution that allows point-to-point wireless communication over a ...
-2
votes
2answers
184 views
Difference between electrical and ethernet signals? [closed]
There are media converters that convert optical to electrical and electrical to ethernet to be transmitted through antenna's. What is the difference here between electrical and ethernet signals, as I ...
3
votes
3answers
195 views
How to make any sensor a wireless one
I am try to build a wireless sensor(right now I am using an adxl335 accelerometer with an analog output) but this project should be general for any sensor that outputs analog. The issue is that I have ...
2
votes
4answers
193 views
Tracking pen within whiteboard surface
(Question in response to the comments.)
I have a fixed flat white rectangular whiteboard of dimensions 1 meter by 0.5 meter and pen. I want to track the position of the tip of the pen within the ...
1
vote
2answers
74 views
Ways of devices to communicate to other devices wirelessly [closed]
I am a programmer and I am trying to figure out a way to get information from wireless devices to gather information from for example I have a device(toy car) I would like to get information(speed, ...
2
votes
1answer
2k views
How to make an USB keyboard work with Bluetooth instead?
I have an USB keyboard (HHKB) which has some great irreplaceable features(That's why I would not like to buy a Bluetooth keyboard directly) and I love to use it very much. But the only improvement I ...
4
votes
4answers
348 views
How can cell phones location be detected?
Specifically: cell phone not connected to internet, not used to talk, just powered
on. What if it's powered off?
1
vote
1answer
170 views
why use OFDM, not PSK/QAM for high speed data transfer
Why is it harder to modulate/demodulate the PSK signals on high baseband frequencies(1 Ghz for instance) with high sample rates than modulate a multicarrier OFDM signal - do IFFT, FFT to ...
0
votes
1answer
71 views
how fast is digital modulator
There are plenty of I/Q modulators produced, how can I learn theirs sample rate(bit rate) from datasheets. There are only LO frequencies and sometimes baseband frequency there.
For instance
0
votes
1answer
115 views
What's the best comunication protocol for a sensor network?
What's the best comunication protocol for a fast and cheap wirelless sensor network?
Is it one of these?
WirelessHART
IEEE 1451
ZigBee / 802.15.4
ZigBee IP
6LoWPAN
Other
-1
votes
1answer
116 views
Wifi device with directional antenna and programmable power [closed]
I need to set up a cheap device for an experiment that sends Wifi signal in a single direction but also allows me to set the power level on the Wifi signal.
I've tried to find a solution and looked ...
2
votes
1answer
175 views
The reading distance limit on passive RFID
It appears that nearly all "passive RFID" tag-reader combinations have around a 5-10cm specification for reading distance.
But I am interested in approx. 20 cm reading distance.
I am assuming one of ...
1
vote
4answers
981 views
Basic microcontroller + RF transmitter/receiver plausibility
I am a complete beginner (I have only gone through the beginners book to Arduino + done a few small projects). I want to know if it's possible to connect a very basic/cheap microcontroller like the ...
1
vote
1answer
644 views
Cheapest 5 meter wireless communication + microcontroller [closed]
I want to have two microcontrollers wirelessly communicate with each other (about 5 meters) (cheapest is radio or Bluetooth, right?) and then beep/blink an LED, etc. depending on whether or not there ...
2
votes
1answer
210 views
Cheap wireless module for M2M communication
We're designing a street light control & monitoring system, which has: solar + induction lamp. Each street light has a wireless communication modules to send/receive data to a central module, ...
0
votes
2answers
89 views
74LVC1G125 on the arduino wireless shield?
What does the 74LVC1G125 do on the Arduino wireless sheild?
Its just a buffer, but is it really necessary, or is it only necessary if you stack a lot of shields? (ie: collectively increasing input ...
0
votes
0answers
153 views
What are these randomly distributed metal pieces on this chip close-up?
Here is a post about extracting electronics out of a smart card. Here're two photos from there (arrows on the second photo are irrelevant to this question):
Note that on both photos the chip is ...
6
votes
3answers
173 views
How does rewinding a smart card antenna into a smaller coil leave it operational?
Here is a description of how one guy extracted the electronics from a smart card and then embedded it into a ring wearable on a finger.
The card in question is more or less similar to the card in ...
