On 22 September 2010 15:09, YES NOPE9 wrote: > 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 ..... =A0 =A0( I won't be doing all of = these ) > I would like a MCU for each LED lamp with the following characteristics = =A0...... > > ++ low cost > ++ able to support bi-directional UART communications on one pin ( softwa= re or hardware UART ) > =A0 =A0 =A0 minimum baud rate of 300 =A0 =A0 =A0faster 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 > > I am planning a 3 wire bus > =A0 =A0Power for addressable LED lamps > =A0 =A0Power and signal ground > =A0 =A0Bi-directional data bus > > * I am also considering a 2 wire bus where power would be interrupted 10 = times per second to allow data to be transmitted. =A0This would require the= lamps to store power briefly. =A0In this case , a much higher baud rate wo= uld be desired. =A0115K baud would suggest a no-power gap of 1 msec. =A0Thi= s would allow ~ 100 bits which should be adequate for one lamp to be comman= ded and acknowledge the command. =A0I am wondering what the cost will be to= provide a lamp the ability to bridge a 1 msec power gap. =A0( Or maybe I d= on't have to .... 1 msec every 100 msec might not be visible. ) > > Any suggestions will be considered. =A0( unless they are anatomically inc= orrect ) How about a 1-wire switch - DS2408 ? http://www.maxim-ic.com/datasheet/index.mvp/id/3818/t/al $ 5.65 each, so not sure if they meet your low-cost requirement. Matt --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .