Re: Fw: Stair LEDs

[Lehane Kellett <lehane@xxxxxxxxxxxxxxxxxxx>]

Ian,
Sounds good.
For icing on the cake......

Option of RS485 full duplex for serial - long connections (PCB with
layout for MAX489, populate as reqd) and allow serial override.
Constant current drive for the LED's.

Lehane


ian.bird@xxxxxxx wrote:
> Hi Gareth
>
> Here are the basic specs from the design which I completed last night.
>
> 7 inputs for external triggers and configuration. ESD protection
> Serial port for re-programming and complex configuration where
available.
> Also enables remote configuration away from the permanent mounting
spot
> 20 outputs at least 100 ma each
> Thermal protection on all outputs (resettable fuses)
> Power and feedback LED's
> 20 removable LED connectors (2 X 10 way) see
> http://www.rapidelectronics.co.uk/
and search on 21-1640
> 10 separate removable ground connectors  (2 X 5 way)
> Power is 12 volts in and I tap off this to get the micro running
>
> PCB layout bit will be come later as I waiting on some thermal fuses
to see
> their footprint.
>
> If I actually build one or two of these is anyone interested in them.
I
> plan to use it on my front step lights as long as I can work out the
beam
> break practicalities. I would estimate the PCB to be the most
expensive bit
> at around a tenner professionally produced in quantities of 2 or
cheaper if
> more than 4. Components will be surface mount to keep the size down
and
> that is what I use these days. For this reason most people would not
be
> interested in a kit. For stairs as per Gareth's setup pressure mats or
> something similar may be the answer.
>
> The 5 extra inputs and status LED will make configuration a breeze
within
> reason if not using the serial option.
>
> Thoughts?
>
> Thanks
>
> Ian
>
>
>
>
>
> ---------+---------------------------->
>                     "jonsemailstuff"
>                     <jonsemailstuff@y
>                     ahoo.co.uk>
>                     Sent by:
>                     ukha_d@yahoogroup
>                     s.com
>
>
>                     16/03/2006 17:29
>                     Please respond to
>                     ukha_d
>
> ---------+---------------------------->
>  
>-----------------------------------------------------------------------------------------------------------------------------
>
>          To:       ukha_d@xxxxxxx
>          cc:       (bcc: Ian Bird/CV/Novartis)
>          Subject:  Re: Fw: [ukha_d] Stair LEDs
>  
>-----------------------------------------------------------------------------------------------------------------------------
>
>
>
>
> The configuration could be done with a single button if you are
> talking about using a uController of some sort. Something along these
> lines:
>
> 1)Press and hold switch for (say) 10secs
> 2)Flash all LEDs twice
> 3)Pres button , wait for desired trigger time, press again.
> 4)Flash all LEDs three times
> 5)Press button, wait for desired light up gap, press again.
> 6)Flash LEDs in sequence at this speed to show what it looks like
> 7)Press button, wait fot desired turn off time, press again.
> 8)Flash LEDs four times.
> 9)Job done!
>
> By pressing and holding the button for 10secs at any time you could
> start again. The uC could also time out after a set time.
>
> Obviously, a second button could make this more elegant.......
>
> Jon
>
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> Yahoo! Groups Links
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