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WIFI Signal Strength
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| Submitted on: |
3/29/2004 5:33:27 AM |
| By: |
jon vaughan
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| Level: |
Beginner |
| User Rating: |
By 2 Users |
| Compatibility: |
VB.NET |
| Views: |
32123 |
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(About the author) |
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//--- PLEASE READ THIS BEFORE DOWNLOADING THE CODE ---//
I have been searching the web for documentation on getting the signal strength from a WIFI device, there seems to be very little about. So I have created a class that simply gets the WIFI signal strength and returns it numerically or graphically as a bar.
Here is my problem though, I dont actually have any WIFI network / devices to test this from. What im hoping is that someone will find this small prject useful and will take it over, test it and if it needs to be changed, change it and then re post it back for the rest of us to use.
What I would like to really know is , what does this function return : Mo("Ndis80211ReceivedSignalStrength"), if I knew that I could finish this class off and post it back as a complete class :)
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Other 1 submission(s) by this author
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Other User Comments
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 3/29/2004 5:46:02 PM: Gary Phetteplace
Works but signal is a negative number and does not read correctly on a progress bar
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3/30/2004 3:31:38 PM: Chris Pietschmann, MCSD, MCAD
In the GetSignalStrength function change this line of code:
Return Convert.ToDouble(dbl_strength)
To:
Return Abs(Convert.ToDouble(dbl_strength))
This will make the number a positive.
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3/30/2004 11:17:15 PM:
Signal strength is normally expressed in dbm (ie db relative to 1 milliWatt, db is a log scale). This will usually be a negative value for receive strength - probably in the range of -90dbm to -40dbm, the -40 beign the stronger signal.
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9/13/2004 5:30:01 AM:
Im trying to get the Signal Strength app to work, but i get an error when i run it.
I think i've narrowed down my problem to the 'imports system' statement in your WifiStrength class.
Somehow, my system seems to recognize the "Imports System.Math", but it doesnt recognize "Imports System.Management". Any help is appreciated. BTW im on VStudio 2003
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9/14/2004 2:28:28 AM:
Hi, found my problem.
It seems i was using .net CF for my PDA which did not support server tools (System.Management).
Anyway, will have to look for a new approach to obtain signal strength reading. Will post it up for those having similar problems as me.
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1/29/2005 9:28:22 AM:
If you would like to test it your self there is an article in eWeek about finding wifi hotspots for free bandwidth.
http://www.eweek.com/article2/0,1759,1611879,00.asp
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1/1/2007 2:08:39 PM: clown engaged
hey it comes back at a negative num as u probably know and the range is not 0 - 100 its 0-200 so u divide by 20 instead of 10 then drawing the bar here is the link 2 the corrected one http://demonz05.googlepages.com/WIFI_Signa_Improved.rar
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3/4/2007 10:49:09 AM: eduard
can I switch on/off wifi module by sw, generally?
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3/4/2007 10:51:01 AM: eduard
can i switch on/off wifi module by app or can you add this to your sample?
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8/2/2007 12:00:57 AM: technogeek00
Hey i downloaded this and found that the signal that is returned is a negative and double the actual number. I fixed it to return the number as 1-100 percent, i tested it because i ran it along side a program that came with wifi card to check wifi strength, it works now.
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