Questions on the implementation of Wi-Fi (802.11) hardware. Note shopping questions are off-topic.
Questions tagged [wifi]
600 questions
42
votes
3 answers
Does Bluetooth interfere with WiFi?
I've read that WiFi b/g/n is using 2.3995 to 2.4845 GHz.
Bluetooth is in between: 2.4000 to 2.4835 GHz.
So what will happen when I put a Bluetooth sending device next to a WiFi sending device?
Will the two devices be aware of each other (like two…
zomega
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40
votes
9 answers
Why is wired Ethernet losing its speed advantage over wireless?
This has been bugging me for a while now. I did a couple wireless transmission courses back in my university days and it's a known fact that wireless transmission is hard. Partly because it's a shared channel, physical objects can be in the way, air…
Francois
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36
votes
5 answers
Why 2.4 GHz Band?
Bluetooth, WiFi, Zigbee, Remote Controls, Alarms, Cordless Phones etc..
Why all of these protocols, devices, etc. use 2.4 GHz band instead of 3.14 GHz. What is so special about it?
cbr
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31
votes
5 answers
Can I build a camera that is sensitive at 2.4GHz?
I want to build a camera obscura as an art project that produces photos of WiFi signals. The idea for now is to build a 125cm x 125cm x 125cm Faraday cage (using fine copper mesh) with a centered hole (diameter of 12.5cm) and 20 x 20 disc shaped…
Lenar Hoyt
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29
votes
10 answers
Why can't Wi-Fi run at 2.4 Gbit/s?
So Wi-Fi runs in the 2.4 GHz band, yeah (and the new ones 5 GHz)? Which means that every second, a Wi-Fi antenna outputs 2.4 billion square wave pulses, right?
So I was wondering, why can't it transmit data on every pulse, and be able to send data…
MC ΔT
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26
votes
3 answers
Does Wi-Fi radiation pass through my body?
I'm curious. I think I'm confused because I don't really understand the way ionizing radiation works.
So the Wifi radiation passes through my body, but has no ionizing effects within my body?
Frank
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25
votes
4 answers
How does TI CC3000 wifi smart config work?
The ti cc3000 wifi chip has a special smart config mode, this is to allow the initial configuration of the wifi access details.
The cc3000 wiki page gives some details on how the process works,
The chip enters a smart config "listen"…
srinathhs
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24
votes
1 answer
What is the purpose of the elements of this antenna?
I have a 5GHz 23dBi Wi-Fi panel antenna which has the geometry shown in the images below.
I have been quite curious as to the purpose of this bizarre antenna design. The elements have such unique shapes, and each is slightly different, though…
Sam Gallagher
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20
votes
8 answers
Cheapest way to add wifi to a project
I need low power wifi for a not-very-data-intensive application. What modules or chipsets should I look at? Other than low cost and low power, I have no restrictions. The cheaper the better.
This is for a high volume product, so both hobby level…
Adam Davis
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19
votes
9 answers
Ideal WiFi to Serial (or SPI) bridge?
What are some recommendations on an ideal WiFi to Serial bridge? My ideal qualities would be:
Simple connectivity, SPI or Serial
Reasonable fast speed, at least 1mbit/sec ideally (though probably wouldn't always need that fast)
Inexpensive, I'm…
davr
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18
votes
6 answers
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 should be greater than WiFi.
In reality, IR…
Muhammad Ikhwan Perwira
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17
votes
4 answers
ESP8266 - is it used in real industry?
I wonder if ESP8266 or similiar (ESP32 for example) modules are used often in real mass production in medical/automotive/military/households industries.
I see many DIY projects with it, but there is a better alternative for mass production?
If yes…
Sławomir Kozok
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16
votes
2 answers
Calculate distance from RSSI
I am working on an indoor positioning system where I need to:
Compute distance based on RSSI (I understand this won't be 100% accurate)
Then do trilateration to pinpoint the location of the wifi signal. This part might be solved via this solution:…
zengr
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16
votes
3 answers
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
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16
votes
3 answers
Why does WiFi have a shorter range than LTE?
It seems confusing that my phone receives -87 dbm LTE signal and shows a full 4 bars with the speeds of
UPLOAD: 20Mbps
DOWNLOAD:13.6Mbps
But my WiFi is showing 1 bar at -89 dbm and I get disconnected as soon as I move slightly away, and speeds are…
ObsessionWithElectricity
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