Re: LED Christmas Light Failures

On Sat, 19 Apr 2008 05:24:19 +0200, Frank Buss <fb@xxxxxxxxxxxxx>
wrote:

D from BC wrote:

I want LED multicolor rope lights. Have not seen them yet.

Neato... Let's see... How about a microcontroller per 3 leds in the
light rope.. Have all the microcontrollers listening to a serial data
line (the slaves). And then control all the microcontrollers with a
master controller.

You mean something like one string of the Cubatron:

http://www.nw.com/nw/projects/cubatron/

It uses the PIC12F629, which is a bit expensive. Some parts of the new RS08
series from Freescale are sold for as low as $0.45 for 500 units:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=MC9RS08KA1CSC-ND
(a bit cheaper from Farnell, at least in Europe:
http://de.farnell.com/1296221/halbleiter/product.us0?sku=FREESCALE-SEMICONDUCTOR-MC9RS08KA1CSC
)

which is half the price of the PIC18F452. It has 2k flash and an internal
clock. Another nice feature and no wonder for Motorola: The instruction set
looks very similar to the good old 6502, which I've used long time ago on
C64.

Motorola did the 6802, not the 6502.


Now you have to think, if you use standard logic like the 7400 any more, if
you can get a full microcontroller for nearly the same price.

Actually sometimes what i need for a project is a handful of 22v10s.
Big speed advantage. Device and programming costs limit most uses to
hobby for me.
.

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