Does anybody remember an old and by now gone mini-computer company by the name of "NBI"?
When asked what is the meaning of their name, the answer was "Nothing But Initials"!
Anybody who tried to come up with a really good name for a company might feel a sympathy for that...
We want to connect lighting bulbs together and its lighting will be controlled automatic using sensors or manual using control unit wich monitoring each bulbs, also Faulty bulbs Could be detected using it.
each 30 node well connected together to Gateway (GPRS module)
Thank you very much Mr Antoniorohit.
Thank you for your interest. Please clarify as to what 'Best' means for you. There are many parameters (bandwidth, overall cost, accessibility, additional functions required) on which to evaluate the system - which is your priority? If you give me some clarity on this, I will be able to answer better. All the best for your project.
This seems to have been a popular miniproject among EE professors. I also did something similar in college back in the 80s.
On another note, my own experience years ago with the first crude PLC system, the X10 system, was not good. Limited address selection on the remote modules meant I was sometimes playing tug-of-war with one of my neighbors over which one of us got to control my swimming pool lights.
About 5 years ago I had the job to analyze options for Broadband Over Powerlines. The target applications was to provide cheap internet and data access to small towns.
I remember having read a lot of forums and there were a lot of concerns about RF interference (the options used OOFDM) and the inability of Power Lines to shield those RF emissions (as coaxial cables do and even coax cables do have power leakages). Power Lines (mainly made of copper and/or Aluminium) were not designed for such purposes and there were a lot of concerns because there were analysts talking that the noise floor will be increased affecting many existing communications (like public safety servicies; long range airplane communications, etc)
At that time it was a very risky move and the investors decided not to follow that direction. There were implementations but in-house or in-building (in france and spain) but not in the outside. The internet link was a DSL or ISDN and the internal distribution was done using the existing power lines (with about 2Mbps of data rate). Yes it was slow but very suitable for home-automation, building-automation and "intelligent homes".
Blog Make a Frequency Plan Tom Burke 17 comments When designing a printed circuit board, you should develop a frequency plan, something that can be easily overlooked. A frequency plan should be one of your first steps ...