Questions tagged [wifi]

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

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39 views

Controlling a Wi-Fi relay switch using a “no-neutral” touch wall switch

I'm planning to install touch wall switches in my apartment. They appear to be powered by leaking current through the switched receiver (e.g. a lightbulb) – no neutral connections. I also wanted to ...
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3answers
53 views

Is it possible to wire up a simple camera module with a separate wifi module to create a live UDP stream without full fledged OS?

Could be any simple camera module, like for example that: https://www.arducam.com/product/arducam-5mp-plus-spi-cam-arduino-ov5642/ Wifi module could be also any available. I imagine I would also ...
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1answer
63 views

Need help identifying solder point, Is it ethernet, usb, what is it

My end goal is to completely rewrite the flimware to create a super secure system. So what I have so far, I have a hdex0016m1 with 2 confirmed uart ports one in use and one nothing was currently going ...
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22 views

Low-power mcu with WiFi+BLE

I need a MCU with support of Wifi 2.4Ghz or 5Ghz and BLE 5.0. I know about ESP solutions, but, as far as I know, they're for beta testing and prototyping. But I need something stable and with low-...
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39 views

Suggestions for selecing a MCU for getting WIfi CSI Data

I am looking to build a system where I need to receive Wifi Signals and then perform some analysis on this. As per my research, I need to access CSI data of the Wifi Signals to build my logical layer. ...
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2answers
143 views

what is the diffrence between 5 VDD and 12V on this pin out diagram

I have this wifi module that i pulled from my dishwasher. On the pinout directions it says 5vdd and 12v im confused on what this means. what is the input power that is needed
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1answer
67 views

How to block / lessen EM-radiation/signal from home Wi-Fi router? [closed]

1) What materials and how can I use to completely block radiation from two antennas of my WiFi router? 2) What materials and how can I lessen by 20-50% radiation/signal from the third router antenna? ...
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9answers
10k views

Why is wired Ethernet losing its speed advantage over wireless?

This has been bugging me for a while now. I did a couple wireless transmission courses back in my university days and it's a know fact, wireless transmission is hard. Partly because it's a shared ...
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1answer
99 views

Can I use a 2.4 GHz antenna for 900 MHz signal?

I have a 900MHz LoRa device that I want to attach a more directional antenna to. I have a 2.4GHz corner reflector sitting around. I was wondering if I can replace the current omnidirectional antenna ...
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3answers
143 views

2.4GHz WiFi module causing interference on 433MHz RF receiver module

I have a prototype board which has two RF modules on it, a 2.4GHz Wifi module (ESP-01) and a low cost 433.92MHz RF receiver module (Wenshing RWS-371F-6). My 433MHz transmitter (a remote control) sends ...
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2answers
5k views

Does Bluetooth interfere with WiFi?

I've read that WiFi b/g/n is using 2.3995 to 2.4845 GHz. Bluetooth is in between: 2.4000 to 2.4835 GHz. So what will happen when I put a Bluetooth sending device next to a WiFi sending device? Will ...
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32 views

Pi Compute LM832 wifi module

I am trying to attach LM832 wifi module to my Pi Compute CMIO board. However i am not able to detect the module on raspberry pi. I believe that wifi drivers are inbuilt in kernel (CYW43438 )? So what ...
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30 views

wifi, emi and shielding analog circuit

Hi I am building an USB sound card circuit for raspberry pi. It involves a button, LED and Sound card IC PCM2912A (TI). I am mounting raspberry pi over the 2 sided pcb on top (top has full digital ...
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17 views

ISM43362 and https connection

I am working with STM32L475 Discovery kit board and I'm using the Wifi Module ISM43362-M3G-L44 I'm trying to connect to an HTTPs server. But it says unexpected socket error. Has anyone experience ...
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1answer
76 views

How to calculate pi-type impedance matching circuit?

The value provided in the first schematic L=2.7nH, C15=2.0pF, C14=2.7pF, how they will get these values. If I want to design an impedance matching circuit for the same (30+j10) ohm, what process I ...
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2answers
80 views

Wireless game controller - polling vs events

I'm creating wireless game controller, but I have problem with sending data - should it be in polling mode or event based? For analog axes I think that polling is better. 100Hz or more polling rate, ...
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0answers
14 views

OFDMA RU allocation

I am studying 802.11ax OFDMA feature recently. I read some paper about OFDMA feature , I was wondering how does AP decide how many of RU would be allocated for STAs that are going to transmit with UL ...
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1answer
40 views

Video stream over RF and converting to Wifi

So, here is the scenario: I have to put a camera far away from my wifi internet hub and want to see the video on my cell phone. I know that I can put Wifi repeaters, but it's not a feasible solution. ...
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1answer
518 views

Is it possible to use ESP32, BLE4 or BT 2 and WiFi same time?

I am planning to use ESP32 module to transfer data using wifi (ESP32 web server AP)to remote PC and also the same time I need BLE to communicate with a mobile app and get some data to eps32. so I ...
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3answers
2k views

Design of 50 ohms RF trace for 2.4GHz…Double layer FR-4 PCB

I will use a 2.4GHz transceiver on my new project. The PCB material will be FR-4 with 1.6mm thickness and the connector is a SMA. My doubt is about the RF trace that should have 50 ohms impedance. ...
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2answers
111 views

WiFi Module inside a metal body

I am using ESP8266 (2.4GHz wifi) in my product which has metallic enclosure on outside but only plastic on the other side. I will be placing this device outside home near gate. Will it be problematic ...
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3answers
109 views

Can two 802.11n devices communicate via a coaxial cable?

Coaxial cables with RP-SMA connectors are often used as extensions for external antennas / with software defined radios. What would happen if I were to connect two access points (wifi chips, via ...
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2answers
123 views

What is the technical difference between wifi and Zigbee? [closed]

I was trying to use the WiFi-dongle in my raspberry pi as ZigBee transmitter. I figured since they both use the 2.4GHz ISM band I should be able to rewrite the protocols somehow to make my WiFi-dongle ...
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1answer
50 views

Gain of wireless antenna? (-3, 0, 3, 6) [closed]

I read somewhere that each time the signal strength doubles, the gain in dB increases by 3. So because it says each time it doubles, it has to start from somewhere, it means 0 db should have some ...
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2answers
94 views

FCC certified module with uncertified antenna: technical or legal issue?

Say I have a consumer device that uses a pre-certified WiFi module. As I understand it, radio modules are certified with a fixed set of antenna choices that were included as part of the module's ...
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2answers
123 views

Metal free zone for WiFi antenna

I am working on a project that requires me to mount a WiFi antenna underneath a roof made of metal sheet. The antenna is mounted at a 2 m height, and the roof is just a few inches above the antenna. ...
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0answers
35 views

Unable to use wifi in MPLAB Harmony v3

I just got started with PIC32MZ curiosity development board with MRF24WN0MA Wi-Fi Module and MPLAB Harmony v3. I am unable to find drivers for wi-fi module (including ATWIN1500c) in harmony v3. ...
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1answer
43 views

SPI pins in wifi module module

I have a WROOM WIFI module .. what are the available SPI pins taken from this IC for communicating? DATASHEET
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2answers
59 views

Shielding to Block Wi-Fi for Testing No Signal

I was trying to conduct a test recently to show that the system I am developing behaved as expected when it can't connect to the Wi-Fi network it is configured for, and then subsequently to test that ...
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0answers
65 views

ESP8266 Webserver not reachable after 2 minutes from reset

I have a Keyes Espressif ESP8266 NodeMCU, I have two LEDs that I want to control which are connected to the ESP. When I open the webpage http://10.0.0.5/5 after ...
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61 views

ESP32 with LNA and PA

I would like to add a low noise amplifier and a power amplifier to the ESP32. As you may know there is only one RF output on the chip. I was thinking of adding an RF switch, and switching between ...
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0answers
60 views

What can i do with a WM8192EU USB module?

I recently came across a wm-8192eu usb module from an old electronic doorbell. It had a socket on the board that it just slid right out of. When i googled the chip it showed a bunch of usb wifi ...
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2answers
107 views

How damaging can a leaky microwave oven be?

This question is mainly about EMC and disruptive RF emissions. I have noticed recently that each time we use our microwave oven the WiFi network becomes unusably slow (it is still working if you get ...
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2answers
206 views

Am I exposed to high levels of radiation at my job? [closed]

I made this post because I have a safety concern about my job as medical device tester. I was reading the user manual of the equipment I work with and found the next warning: “Per FCC regulations, ...
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58 views

What does a wireless chip do?

This is a basic question but it taken my time for a while since I do not have enough knowledge in this area. Recently, I am investigating about functionality of a wifi and bluetooth chip ...
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2answers
44 views

WI-FI module with at least 2MBps data rate [closed]

I want to Use a WI-FI module to connect my FPGA board to an android phone. I need 2 MByte per second data rate. So, can anyone offer me a proper wi-fi module? Unfortunately, most of them have serial ...
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2answers
434 views

What does the wifi amplifier exactly amplify?

The question is not exactly about the wifi, but on how does this operate in full duplex, in principle? As an practical example, lets take some commercial amplifier. As we can see from the picture, it ...
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1answer
115 views

What is the major difference between a WiFi and RF Module? [closed]

In an interview recently, someone asked me what is the major hardware level difference between a WiFi module (ESP8266) and RF module (nRF24L01+) that I had used in my projects. I mentioned that both ...
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1answer
60 views

Can I use a Ku band satellite dish for Wi-Fi?

Satellite TV works at 18-24Ghz and WiFi at 2.4Ghz, will a T.V dish antenna work for WiFi? Diameter of the dish is about 60-90cm
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98 views

Wiring WiFi SD card to TF

I am trying to wire a WiFi SD card so that it will insert into a TF socket. I connected each pin to its equivalent, with an extra GND on the SD card connected to the same on the TF. It's not working, ...
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3answers
138 views

Does data rate increase with channel frequency?

It is commonly said that a higher channel frequency implies a higher data rate. For example, in https://www.howtogeek.com/222249/whats-the-difference-between-2.4-ghz-and-5-ghz-wi-fi-and-which-should-...
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1answer
376 views

Using ESP32 as a2dp sink and access point at the same time

I am trying to make a project where bluetooth and wifi collaborate with each other. Precisely I want to use the a2dp profile to stream the music to one esp, from there via UDP sockets to N esp's. I ...
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1answer
68 views

WiFi signal strength distibution

I wonder how wrong is it to assume that in general case for a non-directional antenna the wifi signal level distirubiton can be described with the function \$y(x) = b - \frac{k}{(x+a)^2}\$, where x is ...
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1answer
85 views

2.4 GHz Chip antenna layout

I am am new to RF design and I need to place a chip antenna due to space limitations. The only antenna that is easily available to me has a very weird layout. There is no physical connection from the ...
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0answers
51 views

Wifi versus Zigbee versus Bluetooth for real-time data sampling

I am working on a project that I would like to send and receive data between a microcontroller (ESP32) and a PC. The microcontroller supports both Wifi and Bluetooth. If I send one single data point (...
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2answers
113 views

How same frequency signal with different power are produced?

My router have settings to configure transmission power and as i know energy of a signal is given by $$ E = h\nu $$ where \$E\$ is the energy of the signal, \$h\$ is Planck's constant, \$\nu\$ is ...
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45 views

Wifi coaxial cable type unknown

Quick question, I was unable to identify the coaxial cable type used in wifi devices(routers ,tablets,etc.) , very thin grey cable approximately 1mm in outer diameter, I need to know the type so I can ...
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1answer
34 views

How to link 3 RF transceivers to 1 antenna

I'm not an RF designer, so excuse the newbie question: How would I link three transceivers, say WiFi and two separate bluetooth transceivers, to a single antenna. I have found a 3-way combiner ...
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0answers
43 views

Creating a 90 deg. circular polarized phased array using two Yagi

Imagine two 2.4Ghz Yagi (WiFi), one mounted with blades horizontal, the other's blades vertical, both aimed at the same target. Each has the same leg of its coax cable (Xmeasurement) longer (either ...
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1answer
66 views

What is typical interface for WLAN chipset on a modern smartphone?

Taking into account nowadays Android smartphones support WiFi 802.11ac, what interface is being used for interconnecting of WLAN chipset with Application CPU? Is it SPI or some other? Is it OK to ...