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

learn more… | top users | synonyms

0
votes
1answer
18 views

Is it possible to use a USB Wifi dongle with STM32F429I Discovery board?

I have been using wifi modules like ESP8266 and EMW3162, but this increases the load of work. I would like to use a usb wifi dongle (because discovery board has extra usb interface). Is it possible? ...
-4
votes
1answer
46 views

Qual a theoretical ability of radio spectrum? [on hold]

Digital TV (VHF) can currently transmit 31.67 Mbit/s. What would be the theoretical ability of radio spectrum band (UHF) and the maximum of the VHF spectrum?
-3
votes
0answers
27 views

Send arbitrary Wi-Fi raw packets with ESP8266 and Teensy 3.1

I have a Teensy 3.1 and a ESP8266, and I want to craft special raw packets (such as ARP packets). I searched the web and I found a discussion on www.esp8266.com ...
0
votes
0answers
15 views

Arduino WiFi goes SOAP XML [on hold]

In my project I need to communicate with smart camera via its wi-fi network through a series of HTTP POST with SOAP XML envelopes within. So, what shield/module I should buy ti do it? Could it be ...
-4
votes
1answer
51 views

How to transfers sensor data through WiFi? [closed]

I would like to send data from 10 sensors from arduino to a laptop connected to the same wifi network. Can anyone guide me on this task.? Advance Thanks. I have only WiFi no internet.
-2
votes
0answers
24 views

connecting an alarm system to a wifi unit that can transmit the alarms to a smart phone [closed]

I would like to be able to connect an alarm system that monitors 29 devices located on a barge being towed without anyone on board to some sort of a wifi unit that can communicate those alarms to an ...
0
votes
1answer
36 views

Mobile WIFI: how close can mobile devices be placed and still have a functional WIFI connection?

I wish to run a large array (50+) of hacked Android phones as a computing cluster. They will need to be networked so I plan to use their built-in WIFI radios to talk over a single WIFI network. (I ...
0
votes
1answer
30 views

Radio Control car telemetry

I am trying to get some input on the feasibility of this project. I will have a radio controlled car. The car will have sensors that will output data like acceleration, gyro something like 6DOF. A ...
0
votes
0answers
8 views

How to setup Arduino Wifi Shield with Red Bear Lab BLE Shield? [migrated]

I'm new to Arduino shields. I'm trying to stack these two shields on an arduino uno for a home automation project. 1 - Arduino Wifi Shield: 2 - Red Bear Lab BLE shield: ...
0
votes
0answers
45 views

Transmitting video over short distance to CellPhone

I am finding ways to design and develop a Microcontroller module that includes a camera. The module should be capable of creating a hot stop and send the video to a Cellphone.The resolution of the ...
1
vote
1answer
96 views

Wi-Fi transmitter/receiver in close proximity: Override interference?

I'd like to control a camera via Wi-Fi (zoom, trigger shutter, etc.), and possibly also capture a live video stream. This will be at an event with a huge number of Wi-Fi devices, and connectivity is ...
0
votes
2answers
155 views

Power Suppy for Modem Router from 12V Car battery [closed]

How i can operate my modem router (KW58283 300M 11N ADSL2+ Modem Router) on 12V car battery. The Modm router is rated as 12V ,1A. I have this battery. The complete router information are here: ...
0
votes
0answers
73 views

Using a flagpole for a Wifi antenna

I would love to use an existing flagpole as a makeshift Wifi antenna, but am not allowed to attach anything to it. I.e. no J-pole, mounted antenna or coax running down it. Will this be at all remotely ...
0
votes
0answers
30 views

Wifi Antenna Selection

For a project I like to use a Wifi Antenna that has directional properties. Imagine the little box as my product that sits on the ground and I want most of the energy to be transmitted upwards. ...
0
votes
0answers
89 views

AT+CIPSEND problem with ESP8266

Here I am facing an issue with ESP8266 CLIENT Programming. The Problem is with AT+CIPSEND Command. This command is working for few times, but after few cycles, it waits too long for "SEND OK". I have ...
0
votes
1answer
110 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 ...
1
vote
2answers
67 views

How to design a metal plate for PCB

I am designing a Esp8266 based WiFi module, and I' not sure if I need one of those metal plates. They are suppose to protect a sensitive area from EMI/RFI, right? Also, how can I design one with ...
-1
votes
1answer
47 views

Wireless amplifier antenna

There is something like an antenna that works like an amplifier, repeating every signal in the device frequency operation range but wireless. I mean that this "dumb" active antenna receive every ...
-1
votes
1answer
43 views

PIC18F25K80 and WiFi [closed]

I want to send information over wifi from my PIC to PC. I need some basic tutorials or guides on this topic. I have searched online but there is no tutorial that starts from the basic. Can anyone ...
-1
votes
2answers
89 views

How do I do real-time streaming of video from a PIC32 with camera/Wifi module onto Amazon S3?

I'm looking at RTP/SIP stacks but don't know where to start. What are Live555, MPEG DASH, oRTP, and ffmpeg? Can they run on a PIC? I'm thinking 720p at 15 or 30 ips. I have code working to upload ...
1
vote
1answer
77 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 ...
-1
votes
1answer
54 views

What is a safe level of electromagnetic radiation measured in terms of received signal strength indicator (RSSI) e.g. -26 dBm?

We know that the laws of our countries set the regulatory limits of EM radiated power based on the EIRP transmit power of the antennas of devices. However, the received incident power is more ...
0
votes
0answers
9 views

How to configure RN171XV to communicate to a DSP33f though Adhoc?

I have went though the steps to make the Ad-hoc use UART but I seem to not be able to any information from the the RN171XV to the DSP33FJ64G (RN171XV and DSP33FJ64G are suppose to talk with the TX and ...
0
votes
2answers
110 views

Is it a best option to use IRF9540N P Channel Enhancement mode MOSFET for switching 3.3V to my WiFi chip?

I am using IRF9540N P channel enhancement mode MOSFET for switching 3.3V to the power pin of the WiFi chip. The connection is as follows Source --------- 3.3V Drain ---------- WiFi chip power Gate ...
1
vote
1answer
45 views

Ceramic antenna for wifi applications

I want to ask how to choose correct ceramic antenna for wifi applications. I've very tight space constrictions and I need to use a small smd antenna. Which is the best antenna(characteristics) for ...
0
votes
0answers
34 views

Wifi and Bluetooth in single board

I am trying to build a system which will have a USB camera and stream the video via wifi. I am using one of those chinese high speed wifi modules from a company called shenzhen Ogemray. The wifi ...
0
votes
2answers
539 views

How to request “GET” from an ASP.NET website using ESP8266?

AT+CIPSTART="TCP","zgrdataserver.com.azhar.arvixe.com",80 OK, works. AT+CIPSEND=92 The response is ">". Works fine, but ...
-3
votes
2answers
180 views

Connecting to Wifi over Bluetooth for embedded systems

I know that these two (Wifi and Bluetooth) are in the same range of frequency (2.4 ghz. At least mine ones are this way). I do not think wifi modules for embedded systems (I use AVR) are cost ...
1
vote
1answer
71 views

Is CE marking on module necessary?

Suppose a RF module has passed CE EMC tests. Must the CE marking be printed on the module itself in order for the approval to be valid if it is to be used in an end product?
0
votes
1answer
154 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 ...
3
votes
1answer
84 views

How to ensure a RF module is indeed FCC compliant as advertised?

Suppose a buyer buys RF modules from China and wants to ascertain that they're indeed FCC compliant as advertised. I'm guessing that this should be a fairly common issue since Chinese ...
-1
votes
1answer
70 views

Which is the better way to send a broadcast signal to a great number of smarthphones in the same place? [closed]

I wonder which could be the better way to send a broadcast signal to a great number of smartphones in the same place at the same time? I'm thinking about 10.000 to 50.000 smartphones in an area of ...
0
votes
0answers
68 views

What happens if a FCC certified module isn't what it claims to be?

Suppose a radio module is already certified by the FCC but the manufacturer decides to ship inferior versions of it without acknowledging that fact, making users oblivious to the change. Do commercial ...
2
votes
3answers
514 views

What kind of metal are RF shields made of?

With the shields typically found on WiFi modules, what kind of metal are they? Are they coated? Here's an example: Thanks
0
votes
2answers
67 views

Could the metal shield on radio modules be tampered with?

I see that most radio modules have a metal shield. Is it for keeping the radio waves inside? If so, could a shield be too thick for its purpose? For instance, if one solders another piece of metal ...
3
votes
1answer
206 views

Must FCC-certified modules be labelled with the correct FCC ID?

The manufacturer of this radio module I bought claims that it's FCC certified, but there's no FCC ID on it (though there is the FCC logo). If the final product is to be FCC tested, would it then be ...
0
votes
0answers
60 views

BlueGiga WF111: SDIO host interface and SPI compatibility

I am planning to use the following in a project: Olimex A20-SOM-4GB (Allwinner A20 SoM) BlueGiga WF111 Wifi b/g/n module The WF111 module has only one host interface, which is SDIO (1-bit by ...
0
votes
0answers
78 views

Impedance matching circuit for ESP8266

The datasheet of ESP8266 says that the impedance matching circuit should be 50 ohms. The ESP-01 uses a L-C-L filter. The value of capacitor is 5.6 pF. What should the value of the inductors be? How do ...
0
votes
2answers
256 views

TCP/IP stack for wifi module

I keep reading about TCP/IP stack for wifi module. I am having bit difficulty to understand that. I am working on hobby project in IoT and need to choose wifi module for Atmega328P. I heard about ...
1
vote
2answers
65 views

Antenna mounting question

Here is the datasheet and drawing of the antenna on this link I need to stick out the antenna from a thick metal enclosure, how much of the antenna should stick out? Is it 19 mm (the black rubber ...
0
votes
0answers
136 views

How to connect Xbee to FPGA using SPI?

I am trying to connect an Xbee to a FPGA using SPI. I found some code online to read in the MISO and convert to an 8bit output register. I have it working in the simulation but I cannot get the ...
1
vote
1answer
516 views

ESP8266 Wifi Module - prints “ready” but not responding to AT commands

Just received my first ESP8266 wifi module with some excitement. However I've been unable to fully communicate with it. I have connected the module to my computer via a usb to serial cable and I'm ...
0
votes
1answer
26 views

connecting wifi module to proxy based wifi

I have a wifi module with micro-controller , but my college wifi uses proxy, SO how can I program proxy credentials in my C program so that my wifi module connected to micro-controller can connect to ...
0
votes
0answers
123 views

Bluetooth LE versus WiFi latency?

How do the best case and typical latency times differ between using WiFi and Bluetooth LE to communicate quickly between two nearby devices capable of using either of these 2 standard wireless ...
1
vote
0answers
82 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 ...
-2
votes
1answer
81 views

how to make an amplifier system to boost my wifi over large distance? [closed]

I am keen to know if I can build a amplifier system which would take my wifi signal as input and boost it over large distance. I know wifi repeaters are out there but I am looking for more powerful ...
0
votes
1answer
116 views

wifi / WIMAX antenna

What the different between WiFi antenna and WIMAX 4G antenna?, I want to boost the signal for my router to 4 km, I found this antenna in local store, but it seems weird there is only 1 leg, not like ...
0
votes
2answers
115 views

Circuit board layout: wifi ceramic antenna next to a electromechanical relay

Is it okay to place a small ceramic antenna not far from a electromechanical relay? Would the magnetic field generated by the relay coil (when on) affect wifi operation? clarifying edit: not far = ~1 ...
0
votes
0answers
31 views

IEEE 802.15.4 standerd

According to Wikipedia the said standard defines physical layer and media access control (MAC) control for devices working in the Sub-1 range. However I noted that this standard is not similar to ...
1
vote
0answers
76 views

HF RFID 13.56MHz Interference from WiFi/BLE 2.45GHz?

If a Wifi/BLE antenna were placed within a multicoil loop antenna for 13.56MHz HF RFID, would there be significant crosstalk/interference?