On 13/12/2016 11:33, whisky-dave wrote:
On Tuesday, 13 December 2016 02:54:08 UTC, John Rumm wrote:
On 13/12/2016 00:23, Dave Plowman (News) wrote:
Got a set of Xmas lights. Gawd knows how they do them at the
price. Blue and White. PS/controller gives a variety of
programmes. Including flashing the blue and white alternately, or
all on together. But only two wires from the PS. I can see
reversing the polarity could have one colour or the other, but
how both at once with no apparent flicker? Fast switching?

Yup pretty much... Throw a bit of PWM into the mix as well, and
you should be able to get dimming and fading effects as well.

It's more than just PWM it's IC2 which uses atmel contollers to
control each individual LED is possible .

https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1

The RGB LED strips are a somewhat more sophisticated setup than many of
the cheap two wire sets of lights though. However the posh versions of
them can do quite impressive lighting effects.



--
Cheers,

John.

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