Re: Fw: Stair LEDs

[ian.bird@xxxxxxxxxxxxxx]

The serial comms will be interrupt driven full duplex although without
hardware flow control. It you wanted it would be easy to add a serial to
485 board on and leave the original design alone. There may be a firmware
update needed but I would be happy to share the code assuming I write it
all myself. Then you would need CodeVision to compile it (or get it
compiled) and load it through the boot loader.

I can add constant current drive for the LED's in this first revision
assuming I can find my notes or how to do this.

Ian





---------+---------------------------->
Lehane Kellett
<lehane@xxxxxxx
emon.co.uk>
Sent by:
ukha_d@yahoogroup
s.com


17/03/2006 11:48
Please respond to
ukha_d

---------+---------------------------->
>-----------------------------------------------------------------------------------------------------------------------------

To:       ukha_d@xxxxxxx
cc:       (bcc: Ian Bird/CV/Novartis)
Subject:  Re: Fw: [ukha_d] Stair LEDs
>-----------------------------------------------------------------------------------------------------------------------------




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
>