On Fri, Jul 22, 2011 at 3:15 PM, Igor Chudov <[email protected]> wrote: > El cheapo ethernet routers cost $9.99: > > http://www.newegg.com/Product/Product.aspx?Item=N82E16833166034 > > I believe that a cheap Ethernet thermometer would cost roughly as much, if > someone wanted to produce it.
Yeah but this Rosewill box is really a plastic box with five connectors surrounding a dedicated ethernet switch chip---a mass market item that's cheap because they make zillions. Anything else has volumes that are multiple orders of magnitude smaller. To get a good price, the only way is to judo the strength of the mass market---repurpose an OpenWRT router or a cast-off PC. Even then, however, you need the Ethernet cable AND the power line---unless you jigged the power (low-voltage DC, of course) over the unused pairs in the Ethernet. This gives me an idea--I think it might work to hook one of those two-wire or I2C Dallas/Maxim temp sensors over a long 'ethernet' cable, and bitbang them. Does anyone know what are the practical limitations on I2C/two-wire? A twisted-pair ethernet cable should help... ------------------------------------------------------------------------------ Storage Efficiency Calculator This modeling tool is based on patent-pending intellectual property that has been used successfully in hundreds of IBM storage optimization engage- ments, worldwide. Store less, Store more with what you own, Move data to the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
