Questions tagged [wifi]

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

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Which ESP32 should I choose? [closed]

I'm currently working on a project that involves speech recognition, audio streaming over Wi-Fi, and driving a TFT display. I've been exploring the options and came across the ESP32-S3-PICO-1-N8R8 ...
Loic Daigle's user avatar
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40 views

Max operating temperature for PCB/Chip antennas

I'm looking for an antenna (PCB or chip), which I'd like to install in an environment that can exceed 110°C. Here are my questions : Should I trust the temperature ranges given for antennas? The ...
Juno's user avatar
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Most efficiently adapting IPEX-MHF1 (Wifi-Card) to IPEX-MHF4 (Antenna)?

We have a lot trouble with the windows driver our Intel Wi-Fi 6E AX211 Wifi-cards. It randomly looses connection and it's a general problem, that a lot of users ...
Tomblarom's user avatar
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78 views

Shielding WiFi signal

I have a device with WiFi connectivity. I want to shield this device from the outside, so no one can connect with the device, no matter how near he stands to it. My device has a small antenna which ...
Maxim's user avatar
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Can WINC1500 be used with SPI for connecting to a router?

I'm planning to buy the WINC1500 WiFi module. I have heard that it contains a SPI layer, which can be used for telling the WINC1500 to connect to a router. But as I can see in the documentation, I ...
euraad's user avatar
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2 answers
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Wi-Fi radio without an antenna [closed]

I'm mostly unfamiliar with radio, but I've read that you will eventually fry a transmitter if you operate it without some kind of antenna or at least a dummy load attached to it. The question is ...
user1686's user avatar
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Reconnecting an external Wi-Fi antenna to a camera PCB. Where and how?

I own a BirdFy Netvue bird feeder. It has a Wi-Fi camera to capture pictures and video clips as the birds come to feed. Unfortunately, the squirrels completely severed the camera antenna. I bought a ...
Ioannis K. Moutsatsos's user avatar
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Can I add WiFi to an Arduino Uno using an ATWINC microchip?

Can I use an ATWINC15x0 microchip to add WiFi functionality to the Arduino Uno by just connecting the relevant pins together directly? UNRELATED BACKGROUND, I recently began my journey into printed ...
Numero7's user avatar
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1 answer
120 views

Commercial 2.4GHz antenna construction differences

I am developing a land to land rover remote control system which will operate on 2.4 GHz. I bought several antennas to mount on the rover to test the range (I currently don't have access to any RF ...
Jano952's user avatar
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2 answers
63 views

ESP8266: Able to flash but no program execution

I designed a PCB based on the ESP8266EX dotn here is the schematic: To flash the board I use the module: https://joy-it.net/de/products/SBC-ESP8266-PROG I am able to flash the board with Arduino IDE ...
Juno's user avatar
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Send wireless signal from a wireless relay to turn a wireless lamp on

I have this wireless relay: The receiver is connected to a pump which is on the 1st floor of our house and can be controlled from the 3rd floor of our house. We have a neighbor (my sister) who can ...
user1764381's user avatar
1 vote
1 answer
165 views

Is it theoretically possible to make an anti-jammer for WiFi? [closed]

From the little I understand of WiFi jamming, it uses strong counterfeit signals that overwhelm legitimate signals. I thought perhaps a device that emitted the same frequency but offset so that it ...
NeRoboto's user avatar
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1 answer
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How to make an 802.11b/g conducted power measurement, getting different results

I am an engineering co-op tasked with measuring the output power of an avionics WiFi unit. I want to measure the maximum conducted power at the coax port to then calculate max EIRP. The challenge is ...
Pxl's user avatar
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2 votes
2 answers
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How to shield from WiFi signal

I'm working on a device which uses Raspberry Pi Pico W and connects to WiFi. I'd like to test how it handles WiFi signal issues and disconnects to make sure it can reconnect properly to WiFi and MQTT. ...
Leonti's user avatar
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Yagi antenna with 16 dBi gain, is it bottle necked by the power input?

I want to expand my PC's WiFi range, but the NIC delivers only 5 W. When I connect the antenna, not much more range is achieved. Is the antenna not the right one, or is the output of 5 W not enough? ...
Raygo's user avatar
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Wired network for a lot of ESP8266 / ESP8285

I found this project at GitHub, and I would like to do the same but add a few improvements. Rotate modules, according to this radiation pattern: Would it work better? As I understand ESP8266 doesn’...
Sergey Tytarenko's user avatar
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Antenna tuning of 2.4GHz WiFi board

I am new to the RF electronics and tuning of antennas. I am working on a 2.4GHz Wi-Fi board design using an ESP32-S2 chip. The board consists of a 50 ohm single ended impedance trace for the antenna ...
JD1910's user avatar
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-2 votes
2 answers
78 views

Tricking CPU's with specially crafted RF signals

Is it possible that I can modulate and craft a RF signal that, once demodulated by a WiFi card and turned back into electrical signals or binary data, can trick the CPU into thinking it's a command ...
AndyCrypto's user avatar
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0 answers
71 views

What is the maximum relative speed at which wireless protocols can operate? (Doppler shift)

Let's take Wi-Fi and UWB. What determines in these standards their robustness to Doppler shift? The most obvious is the range of carrier frequency tolerance. But in both standards this range is ...
Dj Obsidian's user avatar
2 votes
2 answers
230 views

What is used to determine the length of a Wi-Fi SSID and password for the 802.11 standard?

I am finding a lot of conflicting information with regards to the data that can be contained in the SSID and passwords of a WiFi network. I would like to conform to the 802.11 standard and not only ...
Binder's user avatar
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1 answer
153 views

Controlling garage door using microcontroller and transistor

I am trying to control my garage door using a microcontroller connected to WiFi. (Esp8266, nodemcu). The model of the garage door is steel-line sd800, I have found a diagram of my garage door and how ...
zorodluffy's user avatar
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222 views

ESP32-C3 Picoclick C3 missing component

I'm putting together a small PCB. It's based on the open source Picoclick-C3 by the fantastic maker MoeKoe: https://makermoekoe.gitbook.io/picoclick-c3/hardware In the part of the circuit for the wifi ...
legoblocks's user avatar
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125 views

Run Wifi (Intel AX210) with Single Antenna

NOTE - this was originally asked at Superuser, but they suggested I ask it here. Is it possible to run an Intel AX210 chip using a single antenna? I've got an embedded project where a single antenna ...
johnnyb's user avatar
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Parasite cancelation on a LM386N amp

I have put together: an Raspberry Pi Pico that manages a keypad and a simple audio amp based on LM386N. The audio amp is connected via GP22 which provides PWM and plays the role of sound-audio ...
thermike's user avatar
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170 views

ESP32 - Speeding up connection to WiFi AP and REV.3 chip woes

Esp-IDF 5.0, ESP32 Devkit1 Chip REV.3 Even with the official "station" example stripped to the minimum of code (wifi-related only), connecting to the AP with ESP32 takes 2-3 seconds. That is ...
Noideas's user avatar
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1 vote
0 answers
87 views

Latency during UDP transmission via ESP-01S (ESP8266-01)

I'm working on a project that consists in sending data frames at a frequency of 200Hz, from a Teensy 4.1 to another, through two ESP-01S (See diagram and code below). Hardware : The system is composed ...
Juno's user avatar
  • 93
1 vote
1 answer
54 views

Best Processor for WiFi to GbE Bridge [closed]

I’m looking to build a WiFi to Ethernet Bridge, and did an initial test with a Raspberry Pi 4B. I noticed the CPU was always using less than 10% processing power, which makes me question whether or ...
cdubs's user avatar
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1 answer
322 views

ESP8266 not connecting to Arduino IDE

I've been trying to connect the ESP8266 Wifi module to my Arduino Leonardo and program the wifi module from it (using Arduino IDE). However, I'm not able to get the connection established! I tried ...
ludicrous's user avatar
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New ESP32-D0WD-V3 based board has WiFi issues in transmit; receive is OK

I have a custom board with the above chip, and it all works except for the WiFi transmit functionality. I can receive fine with -60 RSSI from my AP 50 meters away, and I receive all my neighbours' ...
Bernard Mentink's user avatar
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1 answer
57 views

Externally powered ESP32 DevKit V1 stops executing after unplugging USB cable

The program below executes perfectly as long as the USB cable is connected. I have a Blynk device with a couple of sliders and an LED. I'm learning to work with the ...
THROCKMORTON JOHN's user avatar
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1 answer
99 views

WiFi Transmitter/Receiver [closed]

I want to create a small, battery-powered electronic device to detect the presence of AC voltage after a power outage. It would then transmit notifications to that effect. The two components of the ...
ChuckE's user avatar
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18 votes
6 answers
5k views

Why is the bitrate of infrared smaller than the bitrate of WiFi?

Infrared has a frequency of 300 GHz – 430 THz, while WiFi has a frequency of 2.4 GHz or 5 GHz. As the frequency of infrared is greater than the frequency of WiFi, the transfer rate (bitrate) of IR ...
Muhammad Ikhwan Perwira's user avatar
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0 answers
162 views

DPDT toggle AND WiFi relay - how do I do it?

As the title states I'm trying to wire BOTH a DPDT toggle switch (on off on) and a WiFi relay. Situation is as follows: I have a motorized ball valve which operates via a DPDT switch. There are five ...
BP Messenger's user avatar
1 vote
1 answer
2k views

Best DIY antenna design for increasing the range of a 2.4 GHz router

I am new to antenna design and this field in general. I am looking to design a WiFi antenna (less than 15 cm x 15 cm) that can effectively increase the range of a 2.4 GHz WiFi router. It should be ...
hyperbola's user avatar
-1 votes
2 answers
263 views

How to send data from a microcontroller to a database without WiFi? [closed]

I am currently working on a project utilizing a microcontroller along with a couple of sensors on a PCB that will be collecting data in backyards/outside. I haven't chosen my supplies yet, and I am ...
Sajeev Magesh's user avatar
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0 answers
199 views

When should I use a Front End Module (FEM) for a Wi-Fi chip?

The WF200 from Silicon Labs has the ability to connect a Front End Module (FEM). I have some questions: Why should I use a FEM? If I need a FEM, then which one fits with the WF200? Can I take an ...
euraad's user avatar
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0 votes
2 answers
131 views

How do I get started with ATWINC-IC from Microchip?

I want to get started with ATWINC-IC from Microchip. It's a WiFi IC that I'm going to implement onto a PCB. I have installed Microchip Studio and now I'm looking for how to start a project with that ...
euraad's user avatar
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0 votes
0 answers
128 views

Does an outdoor PoE Access Point need seperate grounding?

I've searched high and low for an definitive answer on this, including speaking with electricians, but still get conflicting opinions on this. The goal: Install an outdoor wifi access point (AP), ...
cottonBallPaws's user avatar
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0 answers
124 views

Electrical connection between RP2040 and ESP-12F

I'm projecting a PCB board with a Raspberry RP2040 and the WiFi module Ai-Thinker ESP-12F (it is the only available from my PCB provider) following the official documentation, but I have some doubts ...
TechRevo's user avatar
0 votes
1 answer
128 views

WiFi point-to-point in coastal environment - 2.4 vs 5 GHz [closed]

I am planning to provide Internet to a sea floating platform through point-to-point antennas from the coast. The distance is approximately 300 meters and the platform is quite shaky due to the weather....
p_a321's user avatar
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0 votes
1 answer
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Wi-Fi (esp8266) Point-to-Point Connection

Is it possible to have a point-to-point connection over Wi-Fi, similar to how an RF Module would work. No connections involved, just sending or receiving data packets to all nearby networks. I am ...
drew wood's user avatar
  • 239
0 votes
1 answer
48 views

Will I risk damaging my dual-band router if I use 2.4G antennas?

I lost the antennas to my dual-band wifi router (2.4G/5G). Do I risk damaging the router if I install 2.4G antennas?
jackson.c's user avatar
1 vote
0 answers
313 views

ESP32: How to change WiFi SSID using access point with Arduino IOT cloud running

I have been trying to use WiFi.h, WebServer.h and EEPROM.h together with ArduinoIoTCloud.h and Arduino_ConnectionHandler.h to be able to change the WiFi credentials if required without changing the ...
Hayder Ismael's user avatar
-1 votes
1 answer
147 views

ESP01 doesn't show any network

I send the AT-CWLAP command to my ESP01 module, but it returns the same command without any network detected. First I set the module to mode 1 (client mode) with <...
Andrea's user avatar
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10 votes
3 answers
6k views

Why are there no WiFi earbuds?

Because Bluetooth earbuds struggle in my home, due to its layout and electronic noise, I hoped to switch to WiFi technology, which has a good signal throughout the house. Either to connect earbuds and ...
thegreatwhatsit's user avatar
1 vote
3 answers
167 views

Setting up a webserver with several ESP32s

I have one central ESP32 as an access point which hosts a webserver. The goal is to display live sensor data from three more ESP32s on this webserver. These other ESP32s are implemented as stations. ...
Curious99's user avatar
  • 113
0 votes
1 answer
148 views

802.11 Wi-Fi Module that allows direct access to PHY layer [closed]

I am looking for a Wi-Fi RF chip that allows me to bypass the MAC layer. I want to simply select a modulation, frequency and tx power, then add a simple payload and transmit (I am aware there more ...
user1933458's user avatar
16 votes
3 answers
3k views

How is Wi-Fi throughput so high?

While reading specs of a new ASUS Wi-Fi router - it said to have 2 GBPS throughput. How could it reach such throughput if all the WIFI bandwidth should be small and close to 2.4 GHz and 5 GHz?
Ron Vaisman's user avatar
0 votes
1 answer
163 views

Connect 100 ESP8266 WiFi modules to a master (Raspberry Pi Pico W)

I am looking for the most efficient solution for transferring data from ~100 individual ESP8266 WiFi modules, that have sensors connected to them, to my Raspberry Pi Pico W. This will be used for a ...
drew wood's user avatar
  • 239
0 votes
1 answer
218 views

Dual band Wi-Fi antenna simultaneous 2.4+5GHz transmission

There are APs that have dual band antennas and seem to offer simultaneous 2.4+5 GHz operation. I wonder how this simultaneous dual band operation technically works (2 radios using one antenna.) A ...
Kozuch's user avatar
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