433MHz to LAN gateway or miniserver?
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From: Nico Coesel on 2 Apr 2010 11:51 Joerg <invalid(a)invalid.invalid> 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. Thats on-route. When do you need it and in what quantities? -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico(a)nctdevpuntnl (punt=.) --------------------------------------------------------------
From: Jan Panteltje on 2 Apr 2010 12:28 On a sunny day (Fri, 02 Apr 2010 07:41:00 -0700) it happened Joerg <invalid(a)invalid.invalid> wrote in <81me05Fha9U3(a)mid.individual.net>: >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. Those modules are certified. What else if no design? Try shopping unlimited.
From: Frank Buss on 2 Apr 2010 12:40 Jan Panteltje wrote: > Those modules are certified. > What else if no design? > Try shopping unlimited. This doesn't matter. If you are assembling multiple modules to a new device, you have to certify the whole device again (but chances are good, that it passes the tests without problems, if the components passed the test already). -- Frank Buss, fb(a)frank-buss.de http://www.frank-buss.de, http://www.it4-systems.de
From: Jan Panteltje on 2 Apr 2010 12:47 On a sunny day (Fri, 2 Apr 2010 18:40:57 +0200) it happened Frank Buss <fb(a)frank-buss.de> wrote in <16p0s3e190clo$.16ntttgfjbapu$.dlg(a)40tude.net>: >Jan Panteltje wrote: > >> Those modules are certified. >> What else if no design? >> Try shopping unlimited. > >This doesn't matter. If you are assembling multiple modules to a new >device, you have to certify the whole device again (but chances are good, >that it passes the tests without problems, if the components passed the >test already). Use 2 boxes. Boxes are cheap.
From: Joerg on 2 Apr 2010 13:01
Frank Buss wrote: > 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 > Nice! > 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. > Well, this client definitely does not want to do any sort of EMC test. Has to be pre-certed and ready to go. Software writing and (very minor) asembly work would be ok, but not a whole EMC cert session. >> 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. > Yes, it would need channel hopping because 433MHz is pretty crowded in many metro areas. It's the only band that is international enough and offers a few hundred meters range for really low bandwidths. 2.45GHz doesn't work well. Initially I thought maybe some DECT device could be used but I am rather disappointed with that standard. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |