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

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1
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2answers
110 views

What chips do 3$ wifi dongles use? [on hold]

I saw lots of WiFi dongles withing the price range from $2,50 to $3,50 (eg. this one). I am current doind a project using a microcontroller with usb, that requires WiFi. I'm interested what kind of ...
0
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1answer
28 views

Where can I download “wifi android app 16DO module”? [on hold]

I got this product which is a control relay board module for android app, but I need to get the android app for it, where can I download it, and is it free? Thanks
0
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1answer
56 views

Simple Serial-to Wifi communication

I'm working on controlling an incubator by writing commands to its serial port, a 9 pin RS232. The commands are simple byte strings, such as #02ts. The incubator responses are similar to the ...
1
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0answers
8 views

Could using fewer antennae than a wireless NIC has connectors for cause any problems? [migrated]

Could damage to a radio occur? Is there likely to be a performance impact? If connecting one or two of a possible three antennae, will the choice of antenna ports used have any impact?
0
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0answers
66 views

If my WIFI chip has poor performance at 5GHZ, what does that mean to the end user?

I'm testing my WIFI chip, and it has poor performance at 5GHZ. The transmit power I'm measuring is really low. How does this problem manifest to an end user? Will the internet connection be really ...
0
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1answer
47 views

using supermalloy as the core for wifi loop antenna

this is an extension of this question: Why aren't ferrite rod antennas used in WiFi? if you don't want to go through the previous question, then basically i was asking if we can loop wifi ...
7
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2answers
1k views

Why aren't ferrite rod antennas used in WiFi?

Does it have something to do with soft ferrite's low coercivity, still not low enough at gigahertz frequencies? See, I'm putting together high gain receiver antennas and transmitter antennas. Space ...
0
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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
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0answers
44 views

ESP8266 serial-wifi: antenna options

The cheap ESP8266 boards are offered on ebay with two built-in antenna options: with a PCB trace antenna with a ceramic(?) antenna (PCB photographs see below.) Has somebody bought both and ...
0
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2answers
58 views

How can the 2.4GHz ISM band have 130+ channels?

I am a relative beginner regarding wireless communications protocols and I am looking into the protocols used by toy helicopters, in particular the Hubsan X4. According to more experienced people who ...
0
votes
1answer
62 views

Using adafruit Flora or Adafruit Trinket + MPU-6050 3-Axis Gyroscope + nRF24L01+ together

I am trying to do a project where I need to transmit data from an object if the object is moved in a particular way. The restriction is that the device has to be as thin and small as possible. I am ...
0
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0answers
10 views

arduino wifi shield not present error [migrated]

I'm using an HLK-RM04 WIFI shield and arduino uno R3 board. whenever I mount my shield on the uno board and connect it to the pc using a usb only the power led(red) of my wifi shield glows. I tried to ...
0
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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 ...
0
votes
1answer
33 views

Access the internal clock on WLAN chips

I am trying to implement a localization method based on WLAN round trip time (RTT) ranging. Some of the papers I have read suggest doing ranging based on the MAC layer RTTs (beacons, ACK, RTS/CTS ...
0
votes
4answers
80 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
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1answer
35 views

How choose MPU for image streaming and transmission

I want to ask how to choose and how much processing power are required to be able to stream video using a wifi module. I'll explain better; I have a camera sensor of 5Mpx, i want to elaborate video ...
0
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0answers
43 views

Bluetooth antenna design

I am building a system with bluetooth/wifi/GSM. Since I am an RF noob, I have some questions regarding antennas. Some modules come with loop antenna and if you want to create your own PCB there is a ...
0
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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. ...
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
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2answers
78 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
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0answers
49 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
75 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
40 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
318 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
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0answers
33 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
88 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
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4answers
162 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
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0answers
66 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
115 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
318 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
4answers
321 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
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0answers
50 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
68 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. ...
27
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
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1answer
74 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
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0answers
109 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
61 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
189 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
84 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
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0answers
35 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
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3answers
708 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
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0answers
108 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
296 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
109 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
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0answers
99 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
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1answer
285 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
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2answers
160 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
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1answer
99 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
218 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 ...