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battery powered wifi server ?


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4 replies to this topic

#1 Gusss

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Posted 10 May 2015 - 03:18 PM

Is there one that will work for 24 hours with u3 even a 12 volt one ?

#2 LabJack Support

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Posted 11 May 2015 - 07:36 AM

Silex is the only source we know of for a WiFi connected USB Device Server.

 

Another option is to use a more common Ethernet connected USB Device Server, and then add a WiFi bridge to convert the Ethernet to WiFi.

 

With either of these options, you can certainly power from batteries, it is just a matter of getting a big enough battery, and perhaps a DC-DC converter to convert the battery voltage to the voltage required by the device.

 

 

Another option to consider is the T7-Pro.  It is easy to use a stock USB battery to power the T7-Pro, and it has WiFi built-in:

 

http://labjack.com/s...atasheets/t7/vs

 

http://labjack.com/s...asheets/t7/wifi

 

The current draw of the T7-Pro at full power is less than 300mA, so for a quick estimate of run-time at full power take the mAh rating of the battery divided by 300.  The Anker Astro E5, for example, is a 16000mAh battery so might provide up to 53 hours of run-time:

 

http://www.amazon.co...y/dp/B00N2T7U90



#3 Gusss

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Posted 12 May 2015 - 12:36 PM

Wasn't there some issue of the wifi dropping out though ?
Also which specific silex model would you recommend ?

#4 Gusss

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Posted 12 May 2015 - 01:56 PM

Also will these silex thing work on an ad hoc computer to computer wifi network (ie can you connect this device to a laptop directly in a place with no internet)

#5 LabJack Support

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Posted 12 May 2015 - 02:50 PM

 

Wasn't there some issue of the wifi dropping out though ?

 

Not sure if you are talking about the Silex server or the T7-Pro, but same answer for both:  Anything wireless is generally more prone to dropouts than something wired.  If someone stands in the line-of-site, for example, you might get a dropout.  It is quite reasonable to design your experiment to minimize the risk of dropout (strong WiFi signal), and to recover if dropout does occur.

 

 

 

Also which specific silex model would you recommend ?

 

The one we use around here is the older SX-2000WG.  Looking at Silex's web site, the only model they list is the SX-DS-3000WN.

 

 

 

Also will these silex thing work on an ad hoc computer to computer wifi network (ie can you connect this device to a laptop directly in a place with no internet)

 

Ad hoc is not related to whether you have Internet or not.  Ad hoc means WiFi devices are connecting directly to each other, as opposed to the normal situation where WiFi devices connect to a WiFi Access Point.

 

I don't know if Silex supports ad hoc.  The T7-Pro does not support ad hoc.  We have used a "virtual access point" on a laptop when we want to connect a T7-Pro directly to a laptop, so that is usually a way around lack of ad hoc support.




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