Re: Fw: Stair LEDs

[ian.bird@xxxxxxxxxxxxxx]

Sounds like it might be fun then. Don't really care about the triggering
method. I would just have an input or two dedicated to this and buffer it
with a debounce chip. This should with luck enable sleep mode to cut power
consumption. The third input for instant on must be that time when you fall
down the stairs - so you can see where you are going to land ;-)

I was pleasantly surprised to see Atmel have dropped their processor prices
so it is more in line with PIC pricing and should keep the overall cost
down.

The configuration method is the trickiest bit as serial is not the be all
and end all of doing this sort of thing. No serial ports or more terminally
no PC are considerations. Switches take a lot of inputs and are not the
most versatile method as the user will be choosing between a set of pre
designated options. Thinking cap on I think

I will think about this as it should be something that can be made quite
quickly.

Thanks

Ian







---------+---------------------------->
Gareth Cook
<g@xxxxxxx>
Sent by:
ukha_d@yahoogroup
s.com


16/03/2006 10:22
Please respond to
ukha_d

---------+---------------------------->
>------------------------------------------------------------------------=
-----------------------------------------------------
=

To:       ukha_d@xxxxxxx                                 =

cc:       (bcc: Ian Bird/CV/Novartis)                            =

Subject:  Fw: [ukha_d] Stair LEDs                                =

>------------------------------------------------------------------------=
-----------------------------------------------------




Not sure if the Comfort relay boards support changeover - could use that
to trigger the "direction"

As for programming - tricky - depends on what you want. Maplins already
sell a 10 output board for =A330 but that does flashy effects etc. I dont
need that. You could have some DIPs for time length etc for total time to
take to turn on, or the time between each light coming on.

Apart from that, sounds good ! You could use it on the driveway with the
same LED's when someone comes onto the drive :-)

G.



----- Forwarded by Gareth Cook/UK/IBM on 16/03/2006 10:19 -----




So, something like:

Two inputs for triggers, beam breaks or something else? Probably normally
high and trigger when they go low.
Outputs for say 15 or 20 LED's. These would probably use say 100ma max
each
(enough for at least 3 'normal' LED's at 12v)
Some interface for programming (buttons, serial or something?)
User definable delay between triggering and the first LED turning on
User definable delay between each LED turning on (same for all)
Delay to turn off LED's if no triggers to keep them on. Go off in reverse
sequence to the way they went on.
Totally autonomous in operation. Configure, turn on and forget.

Anything else?

Thanks

Ian