Questions tagged [wifi]

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1answer
45 views

What emits more radiation, cell network or wifi?

I've researched in the Internet but can't find any conclusive answer. When will your phone emit more radiation, downloading 1 Mb of data from a cell network (3G, 4G) or downloading the same amount of ...
1
vote
0answers
36 views

Multiple sensor data to WiFi visualized on React Native app: Guidance [closed]

Objective: I want to connect multiple sensors to an item of equipment and visualize the data real-time on an iPad. Mock of Desired Output: Question: I need advice on the best methods to use to ...
0
votes
2answers
348 views

Why channel 1, 6 and 11 are best for Wifi communication 802.11n?

In 802.11n 2.4Ghz, the spectrum is varied from 2400Mhz to 2500Mhz and consists of 13 (or 14) channels, each channel having 20Mhz band width. When I search google for best channel, all websites say 1,...
3
votes
3answers
2k views

Send sensor signals to WiFi network

I want to build a home automation system by hooking up various sensors (e.g., passive IR motion sensors, magnetic door contact switches, vibration detectors, etc.) around the house to detect things ...
2
votes
1answer
258 views

RFID vs. Bluetooth vs. Wifi beacon [closed]

I want to build a small device (beacon) that can send its location (inside of a building) and can receive signals in order to output information on an LED screen. The beacon should communicate with a ...
2
votes
1answer
117 views

Why is WiFi increasing frequency?

WiFi at 60 GHz provides a theoretical data-rate of 7 Gbit/s. The trade-off is limited range and penetration. The main reason for this awesome data-rate is a 9 GHz bandwidth, from 66 GHz to 57 GHz. I ...
2
votes
1answer
256 views

A 40MHz oscillator in usb wifi adapter

I disassembled a usb wifi adapter. I was surprised to see a 40MHz oscillator, when wifi works at 2.4GHz. How the output of the oscillator is scaled to the required frequency?
1
vote
1answer
95 views

Interference between direct signal and reflected signal

A laptop's antenna receives signals from a Wi-Fi router in two ways: signal falling directly on the antenna from the router, say 1 m away signal coming from same router but bouncing off the ...
2
votes
1answer
105 views

Why is Li-Fi faster than regular wifi?

I was wondering, basicly every radio-transsmission works with electromagnetic waves which travels at the same speed whether I modulate the information with a low frequency or high frequency such as ...
15
votes
3answers
30k views

Can wifi signal reception be improved by opening a door?

A wifi user is in a different room than the router. The computer is having a hard time connecting and receiving the wifi signal. Can the wifi signal from the router to the computer be improved by ...
7
votes
4answers
9k views

Is it possible to “boost” a WiFi signal using an aluminum soda can?

I recently discovered that one of my roommates had attempted to boost the WiFi signal by cutting up a soda can and placing it near the router, like this: My roommate was probably following an ...