Questions on the implementation of Wi-Fi (802.11) hardware. Note shopping questions are off-topic.

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0
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2answers
35 views

How to simulate Wi-fi signal strength indoor environment?

I want to simulate Wi-fi signal strengths received by a mobile moving around in X m3 that contains N access points. I must take into account the effect of walls and if possible the effect of moving ...
1
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2answers
44 views

WiFi and collisions

since all WiFi operates in the same frequency which is 2.4 GHZ , if we set a certain number of access points in the same Region , for example , the maximum distance between them is 15 meters , could ...
4
votes
1answer
700 views

Permanent magnets near wifi device

Background I have a small circuit that consists of a microcontroller operating on 14Mhz and a wifi module. This circuit is enclosed in a small plastic box. I am considering gluing a few magnets on ...
-1
votes
0answers
64 views

Use IP Camera as router

I'm trying to build an RC spy car controlled over Android and I was thinking if I can use the IP camera I'm planning to use to send images to the Android device as a router for the board I built..The ...
2
votes
1answer
79 views

Closed circuit Wifi over coax?

If you connect an access point to (PCIe/USB) Wifi card over coax (i.e. no antennas) will it work? If it would work, what would the maximum cable length be? (This is just a thought experiment. I ...
1
vote
1answer
56 views

Can I estimate Wi-Fi's power transmission in function of the amount of data transmitted?

For a specific device connected to specific AP. Can I estimate the differences in radiation power (mWh) depending on the data transmitted (2KB/s vs 200KB/s)? If so, how?
-1
votes
1answer
57 views

Bluetooth dongles vs Wifi dongles

I see a lot of implementations on how to use a bluetooth usb dongle with arduino microcontroller. But I dont see even one single implementation to use with the wifi usb dongles. I get that the stack ...
-1
votes
1answer
72 views

Arduino Uno - XBee communication

I have two Arduino UNO, two Xbee shield, and two Twi Xbee (type XB24). I am very new to xBee and my question is: Can I communicate each other via Wi-Fi ?
2
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0answers
41 views

How is CC3000 placed in Simple Configuration mode?

I've ordered a CC3000MODR and soldered it to a simple breakout board. In the First Time Configuration it mentions a Simple Configuration mode: The CC3000 is placed in Simple Configuration mode and ...
1
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1answer
82 views

To what extent can Gielis' so-called “Superformula” be used to improve the efficiency of WIFI antennas? [closed]

I am new to this Stack Exchange venue, so please don't shoot me if this question is not appropriate. This question was taken Math Stack Exchange. In 2003, the Belgian plant biotechnologist Johan ...
1
vote
1answer
132 views

Transmit and receive 433,92MHz signal from the smartphone [closed]

I would like to use my smartphone to send and receive signals from the devices that is working on the 433,92MHz. I assume that it's not possible to communicate directly with this device from the ...
1
vote
0answers
53 views

Shielded cable vs. unshielded in underwater environment

I know basic electromagnetic theory very well and understand why this works but I'm not sure about one thing regarding usage of coaxial (shielded) cable vs. unshielded (normal conductor) cable when ...
0
votes
1answer
52 views

Building a wireless door opener [closed]

In my parents house, the door is 'unlockable' via a switch. As long as the button is pressed, the door is unlocked. Since I often forget my keys, I thought to make a WLAN-Switch, which is controled ...
11
votes
1answer
235 views

Why does the 802.11 wifi spec allow for 11 channels?

The general wisdom is that it is better to only ever use channels 1, 6, and 11 as they are the only three non-overlapping channels for 2.4ghz wifi (in the US), and two adjacent networks on the same ...
-3
votes
1answer
65 views

Do mobile phones lower their radiation if connected to WIFI [closed]

Suppose you have a phone you use for surfing, but the coverage is poor. As far as I know, that means it would have to increase its signal strength to max, quite possibly to a signal strength much ...
0
votes
2answers
69 views

Directional Wifi Antenna

I am looking for small size(preferably pcb mount) wifi antenna that is directional, more specifically half sphere coverage area. The product I build stays on the ground and I like utilized antenna ...
2
votes
2answers
113 views

Arduino sketch not running startup method

I am trying to use the WiFly shield ( http://www.sparkfun.com/commerce/product_info.php?products_id=9367) with Aduino Mega board. I am making modifications to the built in examples that ship with the ...
3
votes
1answer
66 views

WiFi wave cancellation

Let's assume there is an emitter and a reciver. As the emitter is usually omni-directional, the reciver may get one direct wave and some reflected waves. Why does not these waves influence each other ...
0
votes
1answer
320 views

How to connect a Printer WIFI module wires to an Arduino?

+ I’m a digital artist, found this HP printer on the street and wanted to use its components (motor etc.) on my projects. I was wondering if any of you know if I can use this WIFI module to ...
1
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3answers
282 views

Home Current Meter - is this a good solution?

I want to build a simple current meter to measure my power usage at home, and have the data sent to my blog's database. (I know there are similar solutions out there, but this project seems engaging ...
2
votes
2answers
242 views

Updated. Extending Range of a microstrip antenna with a SMA 2.4GHz Omni Direction 20db wifi antenna

Dear all I have the bellow A2DP bluetooth module which has a zigzag microstrip antenna. I want to extend the gain in the antenna with my 20db wifi antenna. I know as far as that I need to scrape the ...
0
votes
1answer
71 views

Which chip to use for automation using Wifi? [closed]

I am working on a project where I will be controlling a device using android mobile phone (WiFi as medium). Which is the chip at present in the market which is low cost and effective for my ...
0
votes
1answer
263 views

Using TLG10UA03 to send HTTP GET

I am using a TLG10UA03 WiFi interface together with my Arduino board. The intension is to send sensor data to a web server in order to publish it on a web site. I managed to run the TLG10UA03 as a ...
1
vote
1answer
78 views

How to modify a router's antenna? [closed]

I have tried to extend the antenna of my router in order to increase its range. I added a wire few cm long. There was no modification however in the range. The power (-db/m) was the same. Why is that? ...
0
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0answers
28 views

Accelemetor wifi module

I'm looking for a module that sends data from an accelerometer over WiFi. I looked around a bit and found this: Axivity-WAX3, but this was the only module I could find, and the site doesn't provide a ...
0
votes
1answer
62 views

Can a smartphone transmit over the 902-928MHz bands? [closed]

I came across a remote control that uses the 902-928MHz band. Can a smartphone transmit WiFi/Bluetooth over those frequencies? If yes, is there anything special about it? Thanks
1
vote
1answer
83 views

Is Atheros AR6102 all I need for my Wi-Fi SD card reader?

I was recently asked to create an iPhone app to allow the user to view, download and remove photos from an SD card. We can't use the card reader originally chosen, and for some reason I thought it ...
1
vote
4answers
125 views

what is the best method for device location services

I am working on a side project at home and need a way to detect when an object is in certain rooms of a house. GPS is not practical because the difference between my living room and bedroom would be ...
0
votes
1answer
50 views

Does the WiFi alliance protect the protocol documentation?

I was recently studying the IEEE 802.11 standards for WiFi (pretty dry stuff, huh?) and I was wondering this: Would it be theoretically possible for someone not in the WiFi alliance to develop a chip ...
1
vote
2answers
84 views

Sending wifi connection info to an unconnected device

Is there a way to use a wifi connected device (phone, tablet, PC...) to send the required connection info (SSID, password) to an unconnected device through the same network? I'm prompted to ask the ...
0
votes
2answers
111 views

How to build a node sensor network with a base unit to publish to the web

Conceptually what I'm trying to build (using arduino) is a network of X number of nodes that include a number of sensors in each. Each node wirelessly reports their data back to a base unit, which ...
4
votes
1answer
148 views

What connector is similar to U.FL but has no pin?

I am trying to identify this connector style: Look at the two RF micro-coax connectors on the left, just next to the PCB antennas. They look identical to U.FL or IPEX but have no central pin. ...
4
votes
3answers
606 views

What are the units of RSSI, noise and SNR as defined by IEEE 802.11?

I'm a CS graduate, but to my shame have very limited knowledge of electrical engineering and especially antenna theory. As far as I understand, RSSI determines quality of how measurer "hears" the ...
0
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0answers
29 views

Connecting RN171 Module to Host on seperate network

Does anyone know how to set up the RN171 Wifi Module to connect to a remote host which is located on a seperate network? I've been able to setup a TCP connection between the Module and Server on the ...
0
votes
1answer
285 views

How to connect WiFi module and Miсrocontroller via MII interface

WiFi module: WIZ610WI Microcontroller: LPC1788 Purpose: Connect it via MII on PCB I have the following scheme: Do I need a signal delay on TX_CLK? On what line and what the value of ...
5
votes
1answer
3k views

Calculate distance from RSSI

I am working on an indoor positioning system where I need to: Compute distance based on RSSI (I understand this won't be 100% accurate) Then do trilateration to pinpoint the location of the wifi ...
0
votes
1answer
274 views

What will I need to send Video over bluetooth or WiFi to Android phone [closed]

I don't know much about electorics I'm programmer and know some stuff about digital electronics that I learn at school, but I have this idea to send video data from a camera (I found on Alibaba CCD ...
2
votes
2answers
366 views

ARP message to enc28j60

I have made the driver for enc28j60 for LPC1788 and I'm trying to send UDP message to LPC via wifi enabled device (iOS, windows over wifi). But transmission fails. Wifi device sends the ARP request. ...
-1
votes
1answer
184 views

Can you recommend a good schematic or module of a Bluetooth + Wi-Fi combo?

I have found couple Bluetooth+Wi-Fi modules, but they are in the $20-$40 range - which is, for my opinion, too expensive. I am interested in seeing/reviewing a finished (as in proved to work without ...
0
votes
1answer
201 views

Is it possible to change Roving rn-171 WiFly module device configuration through SPI and not UART?

I am interfacing rn-171 WiFly module with PIC18F27J13 chip. I want to save both USARTs available on the PIC for other purposes. I am wondering whether I can just connect the Roving SPI pins to the ...
2
votes
2answers
204 views

Protocol for WiFi network to connect to a website?

Ok, I'm trying to wrap my hands around communicating over WiFi using a microcontroller. There seem to be various options such as UART, SPI etc. If I want an Arduino to get or put content on a ...
3
votes
1answer
352 views

Best solution for Mesh network? XBee?

I want to connect a whole lot of independent sensors (Arduino boards) to the Internet. They are all within 10m of each other. Should I use XBee's and link them in a mesh network and have one access ...
2
votes
2answers
115 views

Which could be the best solution for Wifi Card for a project

I'm new so sorry if my title isn't the best. I wanted to know (as I google it and didn't find a satisfactory answer) where can I find a Wifi Card connection for a project. I have a little device I ...
1
vote
1answer
107 views

Wi-Fi solution for network storage?

We are in the process of developing network storage with integrated Wi-Fi. Here we are facing problem. We have checked various solutions from Texas instruments and Microchip. But CC3000 from Texas ...
2
votes
1answer
207 views

Which of the following microcontrollers can talk to a CC3000 WiFi chip?

I need to build a hardware device that consists of a microcontroller and a CC3000 WiFi chip. I would like to use any one of the following microcontrollers built by Texas Instruments: MSP430F2491 ...
0
votes
0answers
136 views

Indoor Phone/Tablet tracking with multiple nodes

I'm looking into providing a distributed device tracking system using a number of separate nodes to detect Wifi/Bluetooth devices by their MAC addresses. (It's to power an app, not for secret ...
1
vote
0answers
225 views

Communicate through a VPN link using Arduino Uart WiFi Module

Following describes the configuration of the system and other details. The problem is mentioned after that. If the initial description is too much or not needed, please skip it. I have a VPN ...
0
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0answers
68 views

WiFi-UART module taking more time to transmitt data over network

I have used this module for my project. The problem is when I enter IP address to the browser it takes a long time to respond. I have read the datasheet and it has an FAQ in Appendix A Q7 on page ...
2
votes
0answers
94 views

Possible wifi interference with processor

I am building a device that consists of an ordinary WiFi router (WDR4300) as shown here: Which works as a client and scans for networks OK when alone. The problems appear when I add another board ...
0
votes
1answer
93 views

PIC32 stuck after long time

I am using a PIC32MX795F512L which sends CAN messages to a WiFly module (RN-171) using UART. I receive messages over WiFi but after a longer time (20-60 minutes), the PIC seems to be stuck and I have ...