> I am planning a project where addressable LED lamps will hang from a ceil=
ing
> mounted extended rail.
> At one end of the rail will be module containing a power supply for the l=
amps
> 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=20
> ......
>=20
> ++ low cost
> ++ able to support bi-directional UART communications on one pin ( softwa=
re or
> hardware UART )
>        minimum baud rate of 300      faster would be nice ( * 115K baud )
> ++ minimal external components ( such as an oscillator , voltage regulato=
r,
> etc. )
> ++ able to control one to three FETs. One for white light and three for R=
GB
> lighting.
> ++ low cost
>=20
> I am planning a 3 wire bus
>     Power for addressable LED lamps
>     Power and signal ground
>     Bi-directional data bus
>=20
> * I am also considering a 2 wire bus where power would be interrupted 10 =
times
> per second to allow data to be transmitted.  This would require the lamps=
 to
> store power briefly.  In this case , a much higher baud rate would be des=
ired.
> 115K baud would suggest a no-power gap of 1 msec.  This would allow ~ 100=
 bits
> which should be adequate for one lamp to be commanded and acknowledge the
> command.  I am wondering what the cost will be to provide a lamp the abil=
ity
> to bridge a 1 msec power gap.  ( Or maybe I don't have to .... 1 msec eve=
ry
> 100 msec might not be visible. )
>=20
> Any suggestions will be considered.  ( unless they are anatomically incor=
rect
> )
>=20
> Gus
>=20

Seems to me that the 3 wire bus option could be handled quite nicely with o=
ne=20
of the 8 pin pics with internal osc (up to 32MHz now).=20

Of course you also have to define "low cost".

/Ruben
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D

--=20
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