Questions tagged [wifi]

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

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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), ...
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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 ...
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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....
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ESP-NOW Maximum Connections

The esspresif documentation for esp-now (MicroPython) states: The maximum number of paired devices is 20, and the paired encryption devices are no more than 16, the default is 6. If you want to ...
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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 ...
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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?
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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 ...
-1 votes
1 answer
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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 <...
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10 votes
4 answers
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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 ...
1 vote
3 answers
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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. ...
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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 ...
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?
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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 ...
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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 ...
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ESP8266 not working with Arduino Nano

I am building a WiFi-controlled servo project using an Arduino Nano clone, an ESP8266 (ESP01), a G9133 3.3 V voltage regulator, and a generic 9g micro servo. I just realized, it looks like the ESP01 ...
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1 answer
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Linking WiFi MCU to Ethernet PHY via PCIe

I'm trying to link this Ethernet PHY to this WiFi 6 MCU via PCIe to make a single port router. Can I directly connect these two, or do I need some kind of host CPU with two PCIe slots to link them? ...
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2 votes
1 answer
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Using SWRA117D 2.4 GHz antenna on a large board

I've added the board image. There is one ESP32-C3 on a 2 layer FR-4 board. My question is, how much I'm compromising with the efficiency of the antenna by placing it on a ~52X85mm board considering ...
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Additional processor needed for WiFi-MCU module?

I'm reading up on the design of WiFi-to-Ethernet converters, and came across the Ubiquiti U6-LR Teardown. I noticed that both this device and its competitors have not just a WiFi-enabled MCU and PHY, ...
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Ground plane radials not improving monopole design

I have a transmitter setup from my router like shown below. The backplane is made from cardboard and has an RPSMA male wire held up in the middle. It is attached to my router. Goal: design a monopole ...
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3 answers
81 views

Wifi layer 1: Does a receiver have the concept of bandwidth?

This question is driven by Apple. They have a proprietary Wifi API (CoreWLAN) that takes two parameters when changing channels. The first is the channel number, the second is bandwidth. As far as ...
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1 answer
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How to explain mathematically 2.4 GHz and 5 GHz WiFi coverage and maximum range?

The question is why 5 GHz has less coverage and more susceptible to attenuation in long range? How can we mathematically represent how many devices can be covered?
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Best WiFi channel along with 2.4GHz cordless phone [closed]

I have a WiFi router and a Panasonic cordless phone, both are running at 2.4 GHz. Both devices are situated nearly 1 meter apart due to physical limitations. The router does not support 5 GHz and I ...
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Mesh WiFi ESP32-C3

I am referring to the internal communication example for ESP mesh from the last two weeks but I am unable to make connections between two ESP32-C3, one as the root node and the other as the parent ...
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2 votes
1 answer
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WiFi Module Heating Issue [closed]

I salvaged an RTL8188ETV WiFi from an old tablet, I connected usb wires and used AMS1117 3.3V Regulator, it works fine for some time but heats up and looses connectivity, Regulator is tested to be ...
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15 votes
5 answers
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Are antennas specified for a certain frequency?

"LTE 868 MHz Antenna" Why does 868 MHz stand for? Are antennas specified for a certain frequency or is it necessary for something like input type? For example, I want to transmit a 40 MHz RF ...
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Can a wifi device be inductively coupled to its remote antenna?

I’m developing an electronics device that will be towed underwater and which needs to transmit data to the surface. Since RF works poorly underwater, I’m tying to extend the underwater device’s Wi-...
1 vote
4 answers
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Can I determine antenna band without very expensive equipment and knowing antenna length?

I have a lot of GSM and WiFi antennas of various lengths and shapes with SMA connector. I know of the antenna length relation with wavelength, but in some cases it is difficult or impossible to ...
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Troubleshooting WiFi connection of my custom PCB - adding antenna to an ESP32 WROVER

My custom PCB sports an ESP32-WROVER-E. I have noticed that it suffers from weak WiFi connection to the contrary of the WROVER and WROOM dev kits I have (see below for the test I wrote). I suspect ...
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1 answer
134 views

Will a 4 lane PCIe device work if plugged into a PCIe socket the only 1 lane electrically connected

I am designing a motherboard that uses a SMARC format plugin card for the CPU. This card is based on an Intel Atom x6413E CPU. The SMARC CPU card has various interfaces available, including USB2.0, ...
3 votes
2 answers
448 views

How can an ESP8266 (80 MHz) read/write to WiFi (2.4 GHz) when its clock is only 80 MHz?

I don't understand how an ESP8266 can use 2.4 GHz WiFi when its clock is less than this. This question came to me because when looking for a microcontroller. I always find it weird that 400 MHz+ is a ...
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Best antenna design with the following requirements?

I'm looking for the best antenna design with the following requirements Small Discrete Wideband (LTE and WiFi) Directional High gain (20-25dBi with relatively high transmission power) Could anyone ...
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2 votes
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Will my design work to program an ESP8285 IC?

Will this design work to program an ESP8285? I was trying to design an ESP8285 development board for the first time. Before sending the design to manufacturing I would like to know whether or not the ...
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2 answers
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What are the FCC rules on taking a wifi-system out of its current packaging and putting it inside another unit?

I have a wifi module (Advantech WISE-4220) shown in this datasheet. If I remove the outer plastic casing and put the chip/antenna, unmodified, into another plastic case, am I breaking any FCC ...
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2 votes
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Esp32 rf design review

Preamble: this is the first time I'm working in rf circuit design, I went simple and I hope I didn't make any silly mistakes, but I still have some doubts. I am currently designing a garden programmer ...
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2 answers
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Why can't WiFi hardware be used to receive radio stations?

Special hardware is needed to receive radio waves in different frequencies i.e a RTL-SDR. My question is why can't the WiFi hardware get also used to pick up radio ...
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Limited WiFi with NodeMCU

I am using the following code to connect with the WiFi router: ...
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62 views

Preferred method of communication from the inside of a breaker box

I am developing a smart meter that would measure 3-phase current on the main circuit breaker (residential or industrial) and would broadcast the data to an MQTT server. My question is: what is the ...
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1 answer
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Why does it take so long to join a wifi network? [closed]

Accessing a text-only website, including TLS handshake, averages under half a second from first GET request to completely loaded, using my none-too-fast wifi. Yet ...
1 vote
1 answer
103 views

Is it possible to wirelessly bring a 2.4GHz signal through a cable?

Yes, I know wirelessly != cable. What I have: A cheap first person view (FPV) car. The FPV part of it is standalone - essentially a camera connected to a battery-powered WiFi module. The remote ...
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1 vote
1 answer
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What is this coaxial RF connector?

This thing appears on some ASUS motherboard and I could not find out its name. Diameter is about 4.5mm. I need to find its proper mating part to convert this stupid thing to SMA. I prefer not to de-...
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1 vote
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My ESP8266-01 gets hot after connecting CH_PD to the 3.3V

I connected VCC to an Arduino's 3.3 volt and the GND to Arduino's GND. When I connect CH_PD tothe Arduino's 3.3 volt, it gets hot. While the red light is on, the blue light is on, too. On the serial ...
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Providing power to NodeMCU (ESP 8266) from 5V output of an Arduino

Is it possible to power a NodeMCU from 5V output of an Arduino UNO board? I was trying to use the Vin of the NodeMCU as the input from the 5V port of the Arduino. It didn't work. Could anybody please ...
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WiFi Beacon working as BLE Beacon

I had this idea of a WiFi Beacon that works just as a Bluetooth BLE Beacon. I tinkered around with some DIY Bluetooth beacons, like building my own iBeacon for distance measurements. But my questions ...
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Using PCB and external antenna at same time for WiFi

If you use a design with an ESP8266 is there a possibility to use an external antenna (u.fl connector) with a PCB antenna at the same time without using a solder bridge or jumper? Generally speaking, ...
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1 answer
164 views

How should I route the ground plane under a RF trace with a LC balun?

I'm designing a PCB with a ESP32-PICO-V3, with a RF output to a 50 Ohms U.FL (Micro-Coax) connector. The chip supports WiFi and Bluetooth in the frequency range 2.45 +/- 0.45 GHz. Right now, I have a ...
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WiFi path loss formula

I am referring to the Wi-Fi path loss formulas: 2.4 GHz: L = 46 + 25log(d) 5 GHz: L = 53 + 30log(d) I see they slightly differ from the Free Space Path Loss formula. I want to know why and how did ...
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PCI wifi board (Ubuntu OS) to experiment with microwave signals

I would like to use a PCI WiFi board under Ubuntu OS to experiment with microwave signals. I would like to be able to access the board through the software driver and be able to turn on or turn off ...
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How can Bluetooth, WiFi, ZigBee use the same frequencies but have different area coverage?

What makes radio frequency spectrum cover a larger distance for data transfer? Bluetooth, WiFi and ZigBee all use the same band (2.4 to 2.5 GHz) but their coverage area is different. Why? If it's ...
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WiFi (2,4G) Antenna Isolation. Why 3 capcitors version does not work

I need to isolate the antenna from the WiFi transmitter. There are some solutions on the market but none suitable for my application. So I have started some experiments. 2x PCBs creating DIY ...
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Is this esp8266 antenna layout any good?

It's the first time I do a design based on ESP8266 ic (not module) and was wondering if this layout is permissible for 2.4Ghz applications. I acknowledge that the trace must be a bit wider to comply ...

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