Tagged Questions

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

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0
votes
2answers
58 views

Miniaturizing home automation help? [Novice]

Right now I am doing a home automation project and I want to create two things. The first is a device that looks like this but has the capability to also be controlled over wifi using Arduino. I know ...
0
votes
0answers
32 views

Controlling a wifi outlet with sensor parameters

I currently have a wireless temp sensor that I can monitor via phone or computer, however I'd like to connect this sensor to a wifi outlet that turns on an a/c or heater. In order to prevent internet ...
0
votes
2answers
54 views

What's an easy approach to provide Wi-Fi/Webserver to mobile phone apps without hotspot

I'm a software programmer and I'm up to start a project of an embedded outdoor device which I will be able to control by any mobile phone. My preferred approach is having the embedded device provide ...
0
votes
1answer
39 views

WiFi card without host device

So to start I wasn't quite sure about where this question should be asked, so feel fre to relocate it if you want. I'm setting up a system to notify me when a user enters an area. My plan is to use ...
1
vote
1answer
83 views

Connecting external 2.4GHz antenna to Intel Edison

I would like to connect an external 2.4GHz antenna to an Intel Edison. According to Mouser, there are different Edison part numbers for different antenna configurations (internal or external). ...
0
votes
0answers
24 views

How is 802.11 (Wifi) received signal strength (RSS) measured and reported to software?

I have looked around for a while now to find an answer to this question, but answers I find do not fully answer my question. I found this response interesting from another question on this site. ...
4
votes
1answer
62 views

ZigBee vs WiFi for wireless communication

I've been working on a product using WiFi. The reason I picked WiFi, is cause I essentially have 20-30 nodes communicating to a main node via a router. This all works very well, and its easy as its ...
1
vote
4answers
143 views

2.4G signals over single antenna

I want to run run two different 2.4 GHz radio cards off of the same antenna. Is this possible? I was thinking of running both into a splitter and running a single cable to the antenna. The two radio ...
0
votes
0answers
48 views

Experiment using wifi frequency(Wisee) - SDR is the best equipment?

I'm going to do an experiment using Wifi frequency (2~5 Ghz). I need some equipment to generate and receive this 2~5Ghz frequency. I'm currently quite new to this field (RF) - currently majoring in ...
0
votes
2answers
74 views

WiFi relay to DC motor

I'm trying to use a 12 volt WiFi relay setup to control a 12 volt DC motor. The WiFi relay has eight 10 A SPDT relays in it and the motor is 15 A. I understand how to wire it directly to the two ...
0
votes
1answer
272 views

Is there a wifi chip on this board? [closed]

I have a Sony QX10 camera, with comes with built-in wifi. I want to to connect wired ethernet to it. I was hoping I could find a wifi chip inside the camera, and solder to where the ethernet traces go ...
0
votes
3answers
189 views

Sending signals to PC over wifi

I need a microcontroller that would send statuses of it's input pins (around 5 of them, they can be 0 or 1) to a PC over wifi. I thought of using arduino, but I don't know what would I need to make ...
0
votes
0answers
41 views

Making a wifi / bluetooth Glove Controler

I want to make a glove (or something like a glove) that would send a signal to a laptop / smartphone when I touch my fingers and thumb. I heard I could connect arduio with a wifi module, but not sure ...
2
votes
1answer
53 views

Dynamic switching of radio: Change between wireless protocols in the 2.4GHz

I want a radio core (transceiver). I want it to work on both the protocols. 802.15.4 and 802.11 I already know of some SoC which has both the PHY layers to work that up. ...
26
votes
5answers
4k views

Why 2.4 GHz Band?

Bluetooth, WiFi, Zigbee, Remote Controls, Alarms, Cordless Phones etc.. Why all of these protocols, devices, etc. use 2.4 GHz band instead of 3.14 GHz. What is so special about it?
0
votes
1answer
55 views

Distance confusion about Shuncom SZ05-ADV ZigBee module

I ordered this module looking at the datasheet that it has a range of 2000m LOS distance. But now when I test it, I can receive signal from a maximum of 50m distance! It sends 2.4GHz signals. As far I ...
0
votes
0answers
86 views

Converting Ethernet hardwire signals to Wifi using RMII interface and embedded bridge module

I have an embedded sensor that has an Ethernet RJ45 cable/connector, which include Tx+, Tx-, Rx+, and Rx- signals that I need to convert to wireless. I need to embed it with the sensor and it needs ...
1
vote
1answer
46 views

Effect of antenna position indoor and influence of multipath

for my current project I do research regarding indoor-localization and I try to use the RSSI from my wifi to calculate the distance between smartphone and access point. I heared that: ) this ...
1
vote
2answers
139 views

Is it possible to have an universal RF receiver and transmitter (Wifi / Bluetooth)

First of I should make clear that I'm not an engineer. My friends who are helping me with this project are. But me.. well lets just say I know the basics. Problem I have to be honest, it's a first ...
2
votes
2answers
78 views

Could a network of WiFi routers replace an ISP?

If it could be done, it would. But what are the driving forces preventing a company from creating a device that could connect to numerous other routers/devices and relay the information throughout an ...
0
votes
0answers
27 views

RN-XV WiFly network connection time

I'm planning to buy this WiFi module: https://www.sparkfun.com/products/10822. I want to use to build a small network sensor (I know WiFi is not the best for low power consumption but I want to give ...
0
votes
3answers
367 views

Is it possible to measure the distance of a WiFi access point from the receiver?

I have signal strength in dBm and frequency in MHz is is possible to find the distance?? Any idea about how to do it?
1
vote
0answers
77 views

Ubiquiti/UniFi PCB component identification and polarity question

I stupidly dropped a brand new Ubiquiti UniFi AP-LR wireless access point on the floor. The impact broke off a component (shown in the picture) from the PCB which is preventing the AP from working ...
1
vote
2answers
259 views

Is Bluetooth less susceptible to jamming than wifi?

I am developing a mobile peer to peer application that will probably be subjected to RF jamming, and I'm wondering if bluetooth is perhaps less susceptible to jamming than ad-hoc wifi. Bluetooth has ...
20
votes
10answers
5k views

Why can't Wi-Fi run at 2.4 Gbit/s?

So Wi-Fi runs in the 2.4 GHz band, yeah (and the new ones 5 GHz)? Which means that every second, a Wi-Fi antenna outputs 2.4 billion square wave pulses, right? So I was wondering, why can't ...
0
votes
0answers
91 views

Where to start building this wifi video streaming circuit?

I am working on my own quadcopter and I would like to stream video from it to my computer. I know how to do it using Raspberry Pi and wifi dongle hooked to its usb port, but I don't want that solution ...
0
votes
0answers
87 views

RN 171 UDP Configuration not working?

I am trying to use a RN 171 module to send Data using UDP. The RN 171 is connected with a voltage regulator and this is connected to the laptop. I did all the configuration looking at the data sheet: ...
1
vote
1answer
230 views

Wifi on ATmega328P-AU

This is in continuation to my earlier post here: Wifi on Nano v3.0 ATmega328P-20AU Board What if I got a USB hub and connected a wifi USB dongle. Will that provide wifi functionality?
0
votes
2answers
120 views

SNR vs Signal Strength for digital throughput

I'm trying to compare two antennas, A and B for WiFi. A is showing: Signal Strength of -77dBm, but SNR of 9dB. B is showing: ...
0
votes
1answer
82 views

Is there any dependency between SNR and Link Speed for WiFi AP?

Today we use RSSI as indicator of AP quality. However even if you have rssi=-45dm it's not enough to say that AP WiFi guarantees you good BW. Because if many ...
0
votes
1answer
145 views

Instructions on building CMOS camera wifi video transmission [closed]

I am not sure this is the appropriate place to ask this kind of question, but I believe this is the best community to ask. I'd like to learn how to build my own circuit that would be capable of ...
-2
votes
3answers
230 views

What is the maximum height of a wifi signal in atmosphere? [closed]

What is the maximum height of a wifi signal in atmosphere? I am not mentioning range and also I dont want answers in milliWatt. I want to know answer in kilometers or meters.
1
vote
0answers
310 views

UART Wifi module setup

I recently bought this wifi module. Connected it to my pc and set it up according to the example provided. Thinking that it was just plug and play(as advertised) I hooked it up to my Arduino Uno, ...
0
votes
1answer
84 views

Wifi - How does channel difference between transmitter and receiver affect the signal/data?

When scanning a channel for wireless signals it is of course possible to pick up signals from surrounding channels. What I'm curious about (and forgive my n00b-ish-ness regarding the physics behind ...
-1
votes
1answer
114 views

Why wifi can not act like a server and client at the same time?

According to my experiments, any wifi card can (naturally) connect to a access point as a client and act as a server (most of them in ad-hoc mode). Why can not a wifi card behave as both a client ...
1
vote
1answer
55 views

Wifi - Determining the channel of a probe packet

How do applications such as Airodump-ng determine the channel of probe packets they receive? To my understanding, when the receiver is scanning channel 11 it can pick up packets all the way down to ...
0
votes
0answers
87 views

USB CDC RS-232 interface to Bluetooth or WiFi

I have a device that communicates with a computer via an USB CDC RS-232 interface. The thing is that I want to build an interface (on top of that USB interface) that enables the device to ...
2
votes
0answers
261 views

RSSI-Distance calculation help

Using this question as a guide I've been trying to calculate some distances based on RSSI values that I see in our lab. I filled in all the variables with actual data or approximations where necessary ...
2
votes
1answer
42 views

IEEE 802.11 standard on channels

Could someone please help me find (page#) where in the IEEE 802.11 standard it directly says that Access Points are responsible for choosing the channel/frequency to be used and not clients. I know ...
4
votes
2answers
568 views

Battery life with a CC3000 WiFi beacon

We're experimenting with using a WiFi module as a battery driven beacon or RFID tag. The cheapest module out there with plenty of documentation (thank you Adafruit) is the Texas Instruments CC3000. ...
2
votes
1answer
45 views

Best method for trasmitting multiple video feeds at once via Bluetooth or WiFi?

If I want to transmit several video feeds via Bluetooth or WiFi what would be the best method to do so in order to save on bandwidth, increase speed, and maintain quality? I wanted to know what is ...
0
votes
1answer
49 views

How to compute the throughput varying the bandwidth

Let's say that I have two different wireless technologies, A and B. A has a bandwidth of BA MHz, B has a bandwidth of BB MHz. I can compute the capacity of (for instance A) with Shannon: ...
1
vote
0answers
101 views

Extending wifi range using Xbee

Is it practical to use Xbee for extending the wifi range of my home router? I thought of the following steps: Providing the router output to an Xbee transmitting unit. Transmit signals to the next ...
0
votes
2answers
275 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
vote
2answers
49 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
894 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 ...
2
votes
1answer
164 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
83 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
141 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
186 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 ?