Re: Fw: Stair LEDs

["Ian Bird" <ian.bird@xxxxxxxxxxxxxx>]

In short yes, in reality there are some limitations around the what
levels are available when. From the datasheet it seems though that I
can control an individual LED from on to off or vice versa. What
cannot be done is have more than one LED at a different dim level
from the other(s) outside of a range.

Imagine on to off as split into 16 'chunks'. These are a global
setting that affect all LED's. Then each 'chunk' can be split into
16 again on a per LED basis. This means I cannot have one near off
and another near on and both dimming at the same time because they
aren't in the same global 'chunk'.

Not a good explanation but there you go. I will look into the sample
when it arrives and build the PCB to use it and hope for the best.

>From the video and the picture of the micro on the website I would
guess the program is doing software PWM which for a PIC would
consume most of the available program time. Neither here nor there
but I want more from the setup I am designing.

Ian


--- In ukha_d@xxxxxxx, Kevin Hawkins <lists@...> wrote:
>
> Ian Bird wrote:
> > 2) For my own application PWM is a really nice thing to have. To
> > this end I am modifying the design to incorporate a Maxim chip
to
> > help with this. Samples ordered today and the programming gets
more
> > complicated but the end result should be rather sweet.
> > The down side of this is the number of outputs goes to 16 but
that's
> > life.
> >
> >
> I was watching the video at the link that Tim posted earlier in
this
> thread - and in that each step has gradual fadeup/ fadedown -
which I
> have to say is very visually appealing when you see it - much
nicer than
> instant ONOFF.  Does adding PWM mean that this is going to be
possible
> in your design Ian , on a per channel basis ?  If so fantastic - I
think
> it's a polished feature that people will like.
>
> Kevin
>