433MHz to LAN gateway or miniserver?
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From: Joerg on 2 Apr 2010 10:39 Martin Riddle wrote: > "Joerg" <invalid(a)invalid.invalid> wrote in message > news:81l2psFdnbU1(a)mid.individual.net... >> Is there a cheap (as in mass produced and <$100) pod that plugs into a >> LAN port of a regular router and have a, say, 433MHz radio link? >> Something that could then connect to several thermometers or weather >> stations and ask for their readings. >> >> It would have to be accessible from the web by a remote server for >> polling purposes. Maybe it could just be a mini webserver in itself >> that gets polled. 2.45GHz often wouldn't work all that well because of >> range. >> >> -- >> Regards, Joerg >> >> http://www.analogconsultants.com/ >> >> "gmail" domain blocked because of excessive spam. >> Use another domain or send PM. > > A weather base station with a serial port and this > <http://www.lantronix.com/device-networking/external-device-servers/uds1100.html> > > Over $100 > For just the port? That would be too much, and we'd still need a radio module. Ideal would be one that has the radio part in the box. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 2 Apr 2010 10:41 Jan Panteltje wrote: > On a sunny day (Thu, 1 Apr 2010 23:05:06 -0400) it happened "Martin Riddle" > <martin_rid(a)verizon.net> wrote in <hp3mt8$3tm$1(a)news.eternal-september.org>: > >> >> "Joerg" <invalid(a)invalid.invalid> wrote in message >> news:81l2psFdnbU1(a)mid.individual.net... >>> Is there a cheap (as in mass produced and <$100) pod that plugs into a >>> LAN port of a regular router and have a, say, 433MHz radio link? >>> Something that could then connect to several thermometers or weather >>> stations and ask for their readings. >>> >>> It would have to be accessible from the web by a remote server for >>> polling purposes. Maybe it could just be a mini webserver in itself >>> that gets polled. 2.45GHz often wouldn't work all that well because of >>> range. >>> >>> -- >>> Regards, Joerg >>> >>> http://www.analogconsultants.com/ >>> >>> "gmail" domain blocked because of excessive spam. >>> Use another domain or send PM. >> A weather base station with a serial port and this >> <http://www.lantronix.com/device-networking/external-device-servers/uds1100.html> >> >> Over $100 >> >> Cheers > > It is easy to make, a PIC 18F67J60, a 430 MHz module, magnetics, some programming, > maybe 10 $ in parts. > Sure, we can make it, but that's what we wanted to avoid. Just the radio certs can become a pain in the neck. In most countries you must have a blessing from an EMC lab before marketing it. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 2 Apr 2010 10:41 markp wrote: > "Martin Riddle" <martin_rid(a)verizon.net> wrote in message > news:hp3mt8$3tm$1(a)news.eternal-september.org... >> >> "Joerg" <invalid(a)invalid.invalid> wrote in message >> news:81l2psFdnbU1(a)mid.individual.net... >>> Is there a cheap (as in mass produced and <$100) pod that plugs into a >>> LAN port of a regular router and have a, say, 433MHz radio link? >>> Something that could then connect to several thermometers or weather >>> stations and ask for their readings. >>> >>> It would have to be accessible from the web by a remote server for >>> polling purposes. Maybe it could just be a mini webserver in itself that >>> gets polled. 2.45GHz often wouldn't work all that well because of range. >>> >>> -- >>> Regards, Joerg >>> >>> http://www.analogconsultants.com/ >>> >>> "gmail" domain blocked because of excessive spam. >>> Use another domain or send PM. >> A weather base station with a serial port and this >> <http://www.lantronix.com/device-networking/external-device-servers/uds1100.html> >> >> Over $100 >> >> Cheers > > There is a specification used by the likes of Jennic and others called > 6LowPAN (http://en.wikipedia.org/wiki/6LoWPAN) which allows IP addressing of > radio nodes specifically to allow them to be accessed in ths way. There are > also free 6LowPAN stacks on sourcefourge. Jennic certainly do 2.4GHz radio > modules with this, and there may well now be some ISM modules with it. > > The Holy Grail for me thouigh would be a very low power mesh network, such > as DigiMesh, using something like 6LowPAN to connect it to a LAN. > Thanks! Now I know the phrase for searching, LoWPAN. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 2 Apr 2010 10:48 Frank Buss wrote: > Joerg wrote: > >> Is there a cheap (as in mass produced and <$100) pod that plugs into a >> LAN port of a regular router and have a, say, 433MHz radio link? >> Something that could then connect to several thermometers or weather >> stations and ask for their readings. >> >> It would have to be accessible from the web by a remote server for >> polling purposes. Maybe it could just be a mini webserver in itself that >> gets polled. 2.45GHz often wouldn't work all that well because of range. > > I would build it with modules. 433 MHz transceiver, 5 euro: > > http://www.octamex.de/shop/?page=shop/flypage&product_id=1418 > > Ethernet module, 25 euro: > > http://www.olimex.com/dev/enc28j60-h.html > > I thinks this would be sufficient for the LAN port side. The schematic for > the ethernet module is free, so maybe you could create a better PCB for > mass production with the RF module. > One challenge would be that it has to work standalone on the LAN, so it can be polled from the web even if no live computer is connected to this LAN other than a DSL or cable modem. It would have to act as its own little web server or at least auto-connect to a site on the web. > For the sensor boards you can use any cheap microcontroller, which has > sufficient resources for your sensors and the RF module. And the RF module > has already an integrated temperature sensor. > On the sensor board there's already a uC. > The software would be a nice project for a weekend :-) > If this happens I'll tell the client to throw it over your fence. uC programming ain't my cup of tea ;-) -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Frank Buss on 2 Apr 2010 11:40
Joerg wrote: > One challenge would be that it has to work standalone on the LAN, so it > can be polled from the web even if no live computer is connected to this > LAN other than a DSL or cable modem. It would have to act as its own > little web server or at least auto-connect to a site on the web. Then maybe a bigger module would be a good idea: http://www.olimex.com/dev/pic-mini-web.html This is all you need on the LAN side, and a connection to the RF module, which I assume has already all passed all the EMC requirements, so the final device should pass the EMC tests. > If this happens I'll tell the client to throw it over your fence. uC > programming ain't my cup of tea ;-) Thanks. I don't have much time, but if you do the hardware, it should be not too difficult, because the hard programming parts are already done, e.g. TCP/IP stack, web server and there are sample code for initializing and transfering data with the RF module. So I just need to write some error correction (there is already code for this part at http://www.mikrocontroller.net/topic/67273 , if I want to do something challinging and using Hamming error correction for such a low bandwidth application) and a simple protocol with collision detection and maybe channel hopping for querying the sensors. -- Frank Buss, fb(a)frank-buss.de http://www.frank-buss.de, http://www.it4-systems.de |