Questions tagged [wifi]

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

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WL1837MOD SDIO Control(or Wifi module in general)

There are a number of wifi module which are controlled by SDIO(as an option). I am using the WL1837MOD as a specific example but I welcome more general answers. All the documentation for this chip ...
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1answer
40 views

ESP8266-12E unstable WiFi connection (Need feedback)

i have made a small circuit using ESP-12E here is how my circuit looks like: Here i have kept in mind that wifi connection should be stable, still i am not able to get the stable WiFi connection. ...
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30 views

In wifi modules what does the shield have to protect?

All wifi modules have a shield over the chip but what I’m wondering is if the track to the antenna need to be shielded or is it just the chip that needs shielding ? Thanks Ben
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1answer
24 views

Dual sided uFL connections

I am laying out a dual sided PCB, 1.6mm (62mil) thickness. I'm wondering if I can drop a via on the feedline to a uFL connector and place another uFL on the other side. Will this cause unacceptable ...
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2answers
107 views

Shouldn't an antenna with a higher gain provide a stronger signal in the designed direction?

I have a Wi-Fi access point with six antennas: three for 2.4GHz, and three others for 5GHz. The spec of the access point indicates that the gain is 4 dBi for 2.4GHz antennas, and 6 dBi for 5GHz ones (...
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3answers
75 views

How does a wifi antenna work?

let's consider a common wifi antenna (used in routers) like this: I don't understand some its basic features: 1) Is it a dipole or monopole antenna? I see only one conductor, so I'd say it's a ...
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1answer
42 views

Does the ESP32's Long Range capability work with most smartphones?

Recently discovered an ESP32 can be its own access point (controlling or displaying data wirelessly through a web browser not connected to Internet). It also has long-range capability: Long Range (LR) ...
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1answer
70 views

How does my 802.11 a/b/g/n wireless card determine the modulation to use?

I was thinking yesterday about how the 802.11 a/b/g/n standards all use different modulation schemes, but my wireless card manages to detect frames from networks that may use any of those modulations. ...
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26 views

Wireless CAN bus analysis latency

I'm developing a CAN bus to WiFi bridge for car diagnostics using some commercial interfaces but sometimes I see latency can get high and some ECU's does not work, but some others do work, for example,...
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2answers
72 views

Is interleaving used in MIMO?

Correct me if I'm wrong, this is my understanding of MIMO: Is this how MIMO is able to increase data rate?
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66 views

can anyone point me towards the math behind biquad antennas?

I've looked everywhere for the equations to build a biquad antenna. Calculators are nice, but I want the math. Just point me In the right direction since I've had zero luck on Google.
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78 views

How does MIMO increase data rate?

I understand how using multiple antennas helps improve reliability as it combats multipath propagation through redundancy. But how does using multiple antennas increase data rate?
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Is there an international standard on the frequencies used by car toll tags?

We're finding that when we drive through a car-toll collection point, our Car-Pay Wifi connection cuts out. (Music and maps cut out). I'm guessing that the Car-toll tag system uses the same ...
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Having trouble setting up a data call via AT Commands and using the wifi chip as a hotspot

I have a WiFi chip embedded on an evaluation board which also has an application processor which runs A-grade Linux, in addition to a modem processor. I want to set it as a hotspot via hostapd which I ...
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1answer
31 views

Send Serial data and Ethernet data both over WiFi [closed]

we have to make an upgrade in the system which currently uses serial communication using RS 232 which is wired(obviously). send video data via ethernet. So now we want to add send both the data over ...
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Why use both packet detection and symbol time estimation in the receiver of WLAN(WIFI) in 802.11

n IEEE 802.11 Wlan, at the receiver side, we first use packets detection algorithm to detect the start of the packets, and then uses fine symbol timing estimation algorithm to find the start of the ...
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2answers
128 views

How far can a WiFi signal reach in snow?

I am a kid from the mountains. If a person comes into an avalanche the people carry a device which sends and receives. The mates can then search for the victim with their one device(s). If I would ...
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34 views

Displaying data on a GitHub website using the ESP8266 Wi-Fi Module [closed]

I have an ESP8266-01S module and I need some guidance on how I can display my data into a GitHub website. I have previously work with both frontend and backend website programming; therefore, I am ...
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31 views

How to model MIMO channel matrix for numerical results

I am willing to include the channel matrix in my analytical model (which only includes pathloss and antenna gains). But from what I have seen, channel matrix can't be used to produce numerical results ...
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37 views

How to transmit a packet through WiFi interface with specific data rate?

I am doing a project called 'Device free wireless sensing through WiFi'. In the literatures, researchers using PC and WiFi routers to send and receive packet, the channel state information (CSI) can ...
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23 views

ESP32 using BLE but not WLAN

I want to build a little gadget which must use BLE to communicate with a smartphone, but should run for at least 24h using a 500mAh battery. So I think to achieve this, I should be able to switch off ...
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2answers
1k views

WiFi antenna understanding, which is 2.4, 5 GHz

My USB WiFi adapter has two antenna connectors, I have a lack of knowledge of these connectors, few questinos: how to check which connector is 2.4/5 GHz or both are 2.4/5 GHz at the same time? comes ...
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53 views

Home Router - How do routers use multiple antennas and MU-MIMO?

I have few practical questions regarding classic home routers like TP-Link Archer C2 or modern AX10. I welcome longer explanations if it's necessary. Which type of antennas do home routers use? Are ...
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25 views

Bluetooth and Wifi Maximum Power limt

I saw below Bluetooth chip comparison of many module , most of all are having 8dbm max power , what I know FCC has 30dbm and CE has 20dbm Max power limit so why Bluetooth module are limited to only ...
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31 views

Programming CC3200 Microcontroller and Separate Flash Without a Development Board

I have an "Alfie" device which has wifi and USB, but I never use this device, so would like to change its function. It uses the CC3200 microcontroller (which has a little ROM) and a separate ...
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72 views

ESP32 pico D4 SoC(System on Chip) Heat issue

I have designed my own PICO board using PICO D4 SoC with help of the document : ESP-PICO-D4-Datasheet. Everything works perfectly fine except heat is produced when chip is using WiFi functions. I have ...
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1answer
79 views

Can two mobile phones accurately sense the distance between themselves?

This question is inspired from covid19 and current attempts to produce a contact tracing app for a mobile phone. Can two mobile phones accurately (+- 1 m over a range 0-100 meters) sense the distance ...
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46 views

Data transmission through multiple IoT devices

We are implementing a device which will have multiple sensors inside multiple houses in our local area. Each house will have 1 device fixed at a place and data will be transmitted to one central ...
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42 views

Using Telegram bot to get messages from esp32 board

I'm working on a project to light an LED using my phone. I use DOIT ESP32 devkit V1 which is connected to an LED and is controlled by Blynk app via Wifi. I'm trying to write telegram bot which will ...
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1answer
53 views

ESP32 receive BLE data and send via WiFi possible?

I searched quite a long time now but I'mstill not sure whether it's possible using (just one) ESP32 module. What I need/want: I have some sensors sending their data using Bluetooth Low Energy about ...
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1answer
65 views

How to turn on and off LED when ESP32 board reach specific internal temperature threshold?

I'm a beginner and I'm working on a project to turn on and off an LED using a phone app. I'm using DOIT ESP32 Devkit V1 which I control via Wifi using Blynk app, jumpres and LED. at first I wrote a ...
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1answer
92 views

WIFI over wires [closed]

So, guys I have made wifi gun a but it seems not working as there are a lot of trees between my friend's wifi and my home ( 1km distance ), So is there a method to convert wifi to wire and transmit ...
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1answer
28 views

controlling Arduino Uno with nRF24L01

I'm a beginner, I'm working on a new project to light up LED with my phone (through WIFI). I'm using Arduino Uno, nRF24L01, LED, breadboard and jumpers. I don't understand how can I program the ...
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1answer
170 views

How to connect the ESP 8266 to local area network?

I am working on an ESP8266 ESP-12E WiFi Module to turn an LED on and off. Yes, I was able to turn on/turn off the LED with the help of Wifiserver and NodeMCU. The problem is I want to connect the ...
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1answer
66 views

Which parts of this U.FL laptop wifi antenna need to be exposed?

I got these wifi antennas for use in a small metal computer case. I'm cutting some holes in the case to give the antennas exposure, but I'm not sure what parts of the antenna need to be exposed. As ...
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1answer
87 views

Using WiFi Antenna for 5G Mobile Network?

I moved to an apartment located in a basement of a complex. I had to build a setup with a set of 2 external LTE (4G) antennas Wilson Electronics Wideband Directional Antenna 700-2700 MHz Wilson ...
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1answer
53 views

EMC test for device with WiFi module

I want to test EMI radiated for a medical device with a WiFi module. This medical device connects to a tablet to perform its function. In the EMC chamber we have a lan and a USB connection outside ...
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1answer
51 views

Wireless internet signal bi-directional amplification?

So I have little to nothing experience with anything wireless related. the WiFi modem I have in my house is far from my room and the signal is weak, so it reduces the communication rate. my first ...
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1answer
74 views

How does a router send different data to different devices simultaneously?

How does a WiFi router send different data to different devices at the same time? Since all devices connected to it pick up the same signal being emanated by the router, how do they get the data meant ...
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3answers
75 views

Do beam-forming devices expect a particular antenna configuration?

Do beam-forming devices expect a particular antenna configuration? For instance, do they expect the antennas to be a certain distance from one another? Or parallel to one another? Etc. Background Info:...
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1answer
68 views

Are there any pins that need to be wired in certain ways for the ESP8266 to work?

So I'm making a PCB for a project so I don't need to use a node mcu and only need the esp8266 but I not exactly sure if there are any pins that should be wired obligatorily for it to work. Here is my ...
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34 views

Can I use a WLAN mini pcie card (half or full height) in USB WiFi/WWAN slot?

I have a mini PC which has an mSATA and a USB WiFi / WWAN slot. Below is a picture with the board and its slots. I want to know if there is a possibility to install a WLAN mini pcie card (half or ...
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1answer
45 views

WiFi Near Far Interference?

I have several ESPWROOM32 based modules that connect to a far away access point with an RSSI of -70 (it's about 50 feet away through several walls) and a close by access point with an RSSI of -30 (...
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2answers
48 views

How to package pressure, temperature and humidity data for UPD/TCP?

I'm using a Microchip RN1810 wifi module to learn about how to send data (from a PIC24F32KA302) using ethernet /wifi to another device like my windows 10 PC. I'm reading the pressure, temperature and ...
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28 views

UDP streaming over WiFi problem when operating outdoor at ground level

I am working with the following setup: I have an SBC running Ubuntu 18. The board is installed on an outdoor device. The board generates a wireless hotspot and runs a python script which streams UDP ...
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2k views

What innovation made WiFi amenable to mobile devices without prematurely depleting them of power? [closed]

In June 2004, the Economist, in reference to the nascent WiFi standard stated that "It is currently too power-hungry for mobile devices" So how did WiFi go from being extremely power-hungry ...
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2answers
43 views

Synchronizing 2 MCU's ADCs over WiFi

I have 2 devices with analog signals. I want to acquire their signal with 2 MCU's (preferably ARM). fully synchronized with the same sampling frequencies, starting and ending simultaneously user ...
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1answer
20 views

MIMO power output

If local regulations require Wifi's EIRP to be less than 200mW, then for a 4 channel MIMO antenna Wifi tranceiver, will each channel limit the power output to 50mW and each have a 50mW power amplifier?...
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17 views

Easiest way to send basic data from Android to ESP8266 through WiFi

I'm not really familiar with network protocols, but my application is very simple: The ESP8266 is connected to the phone's WiFi hotspot (so they're both on the same network). The phone sends 1 (as in ...
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1answer
59 views

NRF24L01+ (RF Module) for Smart Home Device Communcation

A while back I purchased these RF modules (NRF24L01+) and I am starting a project using them; the project is implementing a network of smart devices as slaves connected to a central wifi-enabled hub (...

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