I am planning a project where addressable LED lamps will hang from a ceilin=
g mounted extended rail.
At one end of the rail will be module containing a power supply for the lam=
ps and a master data controller.
The master data controller will optionally respond to a TV remote control ,=
 an X-10 remote, bluetooth , WiFi .....    ( I won't be doing all of these =
)
I would like a MCU for each LED lamp with the following characteristics  ..=
.....

++ low cost
++ able to support bi-directional UART communications on one pin ( software=
 or hardware UART )
       minimum baud rate of 300      faster would be nice ( * 115K baud )
++ minimal external components ( such as an oscillator , voltage regulator,=
 etc. )
++ able to control one to three FETs. One for white light and three for RGB=
 lighting.
++ low cost

I am planning a 3 wire bus
    Power for addressable LED lamps
    Power and signal ground
    Bi-directional data bus

* I am also considering a 2 wire bus where power would be interrupted 10 ti=
mes per second to allow data to be transmitted.  This would require the lam=
ps to store power briefly.  In this case , a much higher baud rate would be=
 desired.  115K baud would suggest a no-power gap of 1 msec.  This would al=
low ~ 100 bits which should be adequate for one lamp to be commanded and ac=
knowledge the command.  I am wondering what the cost will be to provide a l=
amp the ability to bridge a 1 msec power gap.  ( Or maybe I don't have to .=
.... 1 msec every 100 msec might not be visible. )

Any suggestions will be considered.  ( unless they are anatomically incorre=
ct )

Gus



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