Post a Comment On: ramblinks

Camera bundle






http://www.misco.co.uk/applications/SearchTools/item-details.asp?EdpNo=163428






Wireless might be useful if there is power near the camera position and running a network cable to the PC location is awkward









http://www.icode.co.uk/icatcher/cctvshop/axis-211w-wireless-network-camera-outdoor-bundle-p-216.html

http://www.networkwebcams.co.uk/product_info.php?products_id=599




Standard lensF1.0 varifocal 3.0 - 8.0 mm, CS mount.
Horizontal viewing angle: 27°-67°http://www.icode.co.uk/icatcher/cctvshop/datasheets/axis_211.html
Wide angleVarifocal Megapixel Lens 2.4 – 6 mm (5500-871) M13VG246
47°-111° http://www.axis.com/products/cam_varifocal/
2.8 - 12mm 1/3" Direct Drive Varifocal Lens TG4Z2813FCS
24°-98° http://www.icode.co.uk/icatcher/cctvshop/2.8---12mm-1-and-3-direct-drive-varifocal-lens-(cs-mount)-p-41.html




3G router




Vodafone


http://www.misco.co.uk/applications/factfinder/search.asp?querytext=WRT54G3G




£15 per month up to 3GBor £15 per GB PAYG (£5 per month, per stream)

Three
http://threestore.three.co.uk/broadband/?router=1

T-Mobilehttp://www.expansys.com/d.aspx?i=168845 k
OtherTop Global MB6000 3G Phoebus 3G/Wi-Fi Wireless Router



NAS box




http://www.misco.co.uk/applications/SearchTools/item-details.asp?EdpNo=278766&CatId=2721




Considerations
Access and power (7 - 20V DC, max 5W) for the camera positionLocation of the storage and routerUPSes if the power to the camera location or router/storage location is likely to be interrupted.


Data rate

Image 640 x 480 x 24 bit average compression jpeg 30KB
One frame every 5 minutes, 288 frames a day
approximately 10MB per day, 70MB per week, 300MB per month7.5GB for the two years


Recommendation
NAS box    £92Camera    £9303G router  £110PCMCIA card    £15
Total    £1147
Extras:Mounting hardware, extended power cable
The 3G connection is always on. The router updates rmhtlc.dnsalias.org whenever the IP address changes and forwards incoming connections to the camera or NAS box as determined by a port lookup.


The camera sends a frame to the NAS box and an external ftp server rmhtlc.jpscltd.co.uk every 5 minutes.
An external running process at JPSC Ltd gets a frame from the camera every five minutes via the 3G router and sends an SMS if no activity for 10 minutes.
The three sequences are staggered so that a video stream of three times the frame rate can be assembled (perhaps for neatness we make the time a six minute window with a frame to the three different locations every 2 minutes).





The camera can be accessed at any time over the internet to stream live video. This has cost implications, depending on the frame rate.