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Questions tagged [wifi]

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

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Are these antennas interchangeable?

The small rectangular antenna in the left hand side of the case came with the device (Lilygo-T-RelayS3). The larger one outside the case came from a different device (Old Particle Photon). I was ...
totalconfusion's user avatar
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1 answer
30 views

Correct connection of a Wi-Fi board having both printed antennas and U.FL sockets

An RF part of a dual antenna Wi-Fi module from Aliexpress. We can see coax sockets connected in parallel to printed antennas. Two external antennas and corresponding pigtails are part of the package. ...
ololo ololo's user avatar
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40 views

ESP32: Does PCB without copper affect the keep-out zone of the antenna?

Espressif recommends in their PCB Layout Design that the antenna is placed outside of the board, either top right or bottom right. Interestingly a placement to the top left or bottom left is not ...
Tintenfisch's user avatar
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56 views

Wifi LED Smart Bulb

I'm trying to use my smart wifi bulb ESP8266 as a wireless controller for RGB LED. Currently it's a 9 W bulb works from 220 V AC. My question is, if I disassemble the ESP8266 board from it and use it ...
BMS's user avatar
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14 votes
2 answers
5k views

Which signals (Wi-Fi, mobile phone, and GPS) can reliably be blocked by aluminum foil?

There seems to be conflicting information regarding which signals can be effectively blocked by wrapping the device in aluminum foil. With effectively blocked I mean block the signal as such that the ...
CuriousIndeed's user avatar
1 vote
2 answers
107 views

ESP32 PCB Review [closed]

I am currently designing a PCB to be manufactured. This version is my attempt at a working prototype. I am new to PCB design but am open to accepting any help I can get! My part is meant to function ...
AmateurEnthusiast's user avatar
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36 views

Trying to make a WiFi Range Extender using Skyworks

I'm trying to design a WiFi range extender that can help increase the range of RF signals from an Intel M.2 8265NGW module. Similar to how these amplifiers from sunhans and others do. I initially ...
Mo Mizzi's user avatar
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1 answer
53 views

WiFi connectivity ceases on ESP32 when MAX3232 is powered on the same board

Since my issue could be lying anywhere, I will explain my design details a bit. I have a 4-layer PCB. The stackup is Top-GND-PWR-Bottom. ...
Sener's user avatar
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ESP32 shielding inside an inverter

I am thinking about using an ESP32 as a secondary controller for a 12 V DC to 220 V AC inverter to monitor and control overload, low battery, using relays to switch AC output, etc. The inverter will ...
asim's user avatar
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0 answers
50 views

Intercepting I/O on this simple vibration alarm / glass break alarm

I got these vibration alarms, but they're far too sensitive to leave as is. I want to use HomeAssistant or something to get a notification and decide whether to trigger the alarm, and maybe do some ...
Tophness's user avatar
3 votes
2 answers
727 views

Why does my ESP32 suffer from wifi stuttering when is next to wifi USB dongle?

I have an ESP32 connected to Wi-Fi 2.4GHz. It is positioned next to my PC's Wi-Fi USB dongle, which is connected to the same network at 5GHz. When the PC is on (the USB dongle is active), my ESP32 ...
Said Torres's user avatar
1 vote
0 answers
47 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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1 vote
0 answers
80 views

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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0 answers
91 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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1 answer
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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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1 vote
2 answers
73 views

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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327 views

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
0 votes
1 answer
126 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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0 votes
2 answers
122 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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0 answers
58 views

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
196 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 vote
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
96 views

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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0 votes
1 answer
120 views

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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0 votes
0 answers
43 views

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
1 vote
0 answers
153 views

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
81 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 ...
19216811's user avatar
1 vote
0 answers
83 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
352 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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0 votes
1 answer
196 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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0 answers
322 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
0 votes
0 answers
161 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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0 votes
1 answer
70 views

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
1 vote
0 answers
105 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
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1 vote
1 answer
56 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
  • 425
0 votes
1 answer
505 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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0 votes
0 answers
166 views

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
0 votes
1 answer
63 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
0 votes
1 answer
101 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
219 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
4k 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
388 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
0 votes
0 answers
320 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
  • 1,324
0 votes
2 answers
169 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
166 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
138 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
156 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
  • 113
0 votes
1 answer
109 views

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
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