DOWNLOAD THE LATEST STAMP MANUAL FROM PARALLAX WEB SITE, EXAMPLE APP ON X10 -----Original Message----- From: Eric van Es To: PICLIST@MITVMA.MIT.EDU Date: 28 September 1997 10:09 Subject: Re: Data transmission over power lines >Alberto Smulders wrote: > >> Hello, >> >> For remote sensing and controlling in a greenhouse, we want to use >> bi-directional data transmission over power lines, using very cheap >> hardware (microcontroller eventually with incorporated ADC and >> relays/triacs for controlling stuff), so we can chatter around small "black >> boxes" in the greenhouse where we need them, without lots of dedicated >> wiring to a central controller; all the "black boxes" under control by a >> central PC running Win95 or (maybe) Win NT. > >You are brave to use Win95 where there's more than 12VDC running around! Make >sure that a system hang-up does not electrocute your entire green house! > >Perhaps you should still use external hardware to isolate your micro from the >AC. A friend of mine is building a "mains intercom" out of some mag. If you are >interested I'll find out which one. Perhaps/(lawfully) mail it to you. > >> Generating FSK signals with the same microcontroller must be easy >> (frequency is low, around 100 kHz for power line data transmission). >> But is it possible also to use the microcontroller for filtering/decoding >> the signals, without using dedicated extra hardware? >> Any ideas - suggestions - critics - experiences - stories on frustrations >> (or not) - are welcome. >> Thanks.... >> >> Albert A. Smulders >> InSAD - Encarnacion, Paraguay >> South America >> insad@itacom.com.py > > > >-- >Eric van Es | Cape Town, South Africa >mailto:vanes@ilink.nis.za | http://www.nis.za/~vanes >LOOKING FOR TEMPORARY / HOLIDAY ACCOMODATION? >http://www.nis.za/~vanes/accom.htm >