• Wi-Fi signals visualized in 3D
    22 replies, posted
[video=youtube;aqqEYz38ens]http://www.youtube.com/watch?v=aqqEYz38ens[/video] [url]http://cnlohr.github.io/voxeltastic/[/url]
This is the most fascinating shit to me. It's like that animation of the empty space inside an atom. Incredible
[QUOTE=EcksDee;47160294]This is the most fascinating shit to me. [B]It's like that animation of the empty space inside an atom.[/B] Incredible[/QUOTE] Wich one is that?
My only question is: why is there such a weird pattern in signal strength? Why is it not a smooth(er) linear/radial/spherical gradient?
[QUOTE=godfatherk;47160316]Wich one is that?[/QUOTE] [Media]http://www.youtube.com/watch?v=J3xLuZNKhlY[/Media] quick summary, also includes the clip the animation got a big prize or something IIRC
Looking at this guys videos makes me realize how much time I waste doing stupid shit [url]https://www.youtube.com/user/CNLohr/videos[/url]
[QUOTE=Darkwater124;47160318]My only question is: why is there such a weird pattern in signal strength? Why is it not a smooth(er) linear/radial/spherical gradient?[/QUOTE] Likely because it's electromagnetic waves, and as waves they have constructive and destructive interference. Think of those videos where people put rice on subwoofers and it makes those odd patterns.
[QUOTE=Brt5470;47160446]Likely because it's electromagnetic waves, and as waves they have constructive and destructive interference. Think of those videos where people put rice on subwoofers and it makes those odd patterns.[/QUOTE] This. Check out the numerical calculation of the wifi-signal in a 2D floorplan: [media]http://www.youtube.com/watch?v=6hcK9B4HHY8[/media] [URL="http://jasmcole.com/2014/08/25/helmhurts/"]Blog post about it.[/URL]
[QUOTE=Darkwater124;47160318]My only question is: why is there such a weird pattern in signal strength? Why is it not a smooth(er) linear/radial/spherical gradient?[/QUOTE] At 2.4Ghz (WiFi frequency), a lot of stuff "looks" reflective to the EM wave. As such, you get a lot of reflection from objects in the area, so the signal ends up reaching the receiver via a multitude of different paths, all at different phases. These signals interfere with one another and cause constructive and destructive interference like Brt said. It's this "multipath propogation" that MIMO technology exploits e: how is this dumb, I would hope I'm not wrong because I've just studied this stuff for my degree
Massively fascinating, and makes sense that the 'dips' & 'peak's of the signal occurs roughly every half-wavelength due to most devices utilizing antennas that are either half or quarter wavelength. I wonder if he took orientation of the device relative to his laptop into account.
I remember doing something similar with my phone, but never got this much detail(phone signal strength is simply not responsive enough to be useful). Super hot
Why do routers tend to use two antennae if we know that two identical wave sources create not-insignificant areas of destructive interference?
[QUOTE=Maloof?;47161768]Why do routers tend to use two antennae if we know that two identical wave sources create not-insignificant areas of destructive interference?[/QUOTE] Dipole antennae. [editline]17th February 2015[/editline] [url]http://en.wikipedia.org/wiki/Dipole_antenna[/url]
Could also be duplex
[QUOTE=Uberpro;47160361]Looking at this guys videos makes me realize how much time I waste doing stupid shit [url]https://www.youtube.com/user/CNLohr/videos[/url][/QUOTE] [video=youtube;cWpdxGBB5ao]http://www.youtube.com/watch?v=cWpdxGBB5ao[/video]
[QUOTE=EcksDee;47160294]This is the most fascinating shit to me. It's like that animation of the empty space inside an atom. Incredible[/QUOTE] This shit seems rather dangeerous.... what about electro magnetic radiation? It seems that we being so naive as to think of the "yyay" 'Free wifi' rather than our own health ..
[QUOTE=Chai;47177308]This shit seems rather dangeerous.... what about electro magnetic radiation? It seems that we being so naive as to think of the "yyay" 'Free wifi' rather than our own health ..[/QUOTE] You should turn off your monitor then, because that monitor emits shittons of EMR.
[QUOTE=Chai;47177308]This shit seems rather dangeerous.... what about electro magnetic radiation? It seems that we being so naive as to think of the "yyay" 'Free wifi' rather than our own health ..[/QUOTE] I'm sorry to say but nearly everything emits electromagnetic radiation. Even your body does.
[QUOTE=Chai;47177308]This shit seems rather dangeerous.... what about electro magnetic radiation? It seems that we being so naive as to think of the "yyay" 'Free wifi' rather than our own health ..[/QUOTE] better pray to the lord that be that the dangerous magnetic radiation doesn't ionize your body then I guess
[QUOTE=Chai;47177308]This shit seems rather dangeerous.... what about electro magnetic radiation? It seems that we being so naive as to think of the "yyay" 'Free wifi' rather than our own health ..[/QUOTE] umm everything you see is EM radiation lol
[QUOTE=Chai;47177308]This shit seems rather dangeerous.... what about electro magnetic radiation? It seems that we being so naive as to think of the "yyay" 'Free wifi' rather than our own health ..[/QUOTE] It's non-ionizing.
[QUOTE=Uberpro;47160361]Looking at this guys videos makes me realize how much time I waste doing stupid shit [url]https://www.youtube.com/user/CNLohr/videos[/url][/QUOTE] He spent 6 hours making his desk lamp work over the network. [media]http://www.youtube.com/watch?v=oh4ZDkBHFYM[/media]
[QUOTE=Foxtrot200;47181417]He spent 6 hours making his desk lamp work over the network. [media]http://www.youtube.com/watch?v=oh4ZDkBHFYM[/media][/QUOTE] That was an awesome 45 minutes of my life. Sweet god that CAD software was awesome. Confused on why he used such huge resistors. Must use them for ease. Suppose with a revisit he'd stick them on the PCB
Sorry, you need to Log In to post a reply to this thread.