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

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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 ...
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1answer
30 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 ...
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2answers
51 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 ...
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1answer
38 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 ...
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1answer
35 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 ...
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2answers
47 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 ...
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1answer
66 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 ...
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1answer
43 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 ...
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8 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 ...
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2answers
72 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 ...
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1answer
37 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 ...
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30 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 ...
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2answers
249 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 ...
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2answers
89 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 ...
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1answer
67 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?
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1answer
112 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 ...
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1answer
81 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 ...
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1answer
62 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 ...
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65 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 ...
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3answers
506 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
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2answers
64 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 ...
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1answer
157 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 ...
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40 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 ...
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55 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 ...
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135 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 ...
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2answers
51 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 ...
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120 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 ...
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1answer
353 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 ...
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1answer
22 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 ...
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91 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 ...
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60 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 ...
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1answer
75 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 ...
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1answer
90 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 ...
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2answers
94 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 ...
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28 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 ...
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58 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?
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177 views

How to connect FPGA to Xbee? [closed]

How can I connect an Xbee to FPGA to transmit data.
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2answers
114 views

Why do wifi channels overlap?

In the United States and Canada there are 11 channels available for use in the 802.11b 2.4GHz WiFi Frequency range defined by the IEEE. But there are only 3 non-overlapping channels available in the ...
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1answer
35 views

Wifi Channel vs a Sub 1 GHz channel of same width

If the same channel-width is allocated for a WiFi channel and also for a Sub-1 GHz channel, would the maximum allowable speed be the same for both channels theoretically? If they differ, what is the ...
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1answer
101 views

RSSI measurements near wifi router

I have a question about RSSI and EIRP. When I bring my smartphone very near my antenna wifi router (+20 dBm EIRP) the analyzer wifi application shows me an RSSI level about -20 to -25 dBm (a negative ...
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1answer
91 views

How to find out Packet Loss in a Broadcasting environment

Indeed packet loss is an important metric to use when comparing different communication protocols. To me it is understandable how one would computer Packet Loss in a unicast transmission. Simply the ...
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1answer
98 views

Best MCU platform with over-the-air firmware flashing capability? [closed]

I know spark.io is well known for this feature, but I'm searching for alternatives that offer hassle-free over-the-air firmware patching and has also some open implementation examples available. ...
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1answer
133 views

hlk-m30 WebClient example

I have started working on HLK-m30 WiFi module. I am developing the simple client on the module using simple AT commands. I have Opened socket TCP client and then Write data using the command. ...
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28 views

802.11 Channel Use Regs

With a 5.8Ghz WLAN device, operating in the upper UNIII band, 5745mhz-5825mhz... ...is it required that if the device is using a standard 20mhz wide 802.11 channel, that you can ONLY be centered on ...
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2answers
156 views

What chips do 3$ wifi dongles use? [closed]

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 ...
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1answer
80 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 ...
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75 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 ...
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1answer
88 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 ...
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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 ...
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1answer
83 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 ...