Hi Stuart

I have done a single zone dimmer using a 12c508 or a 12c671(as a slave.
Do you or any one else have an idea on how to do short circuit protection to
protect the triac?

OK all will probably shout FUSE... but this is not an option.


Thanks
Thys



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@mitvma.mit.edu]On Behalf Of Stuart Meier
Sent: 05 January 2003 20:27
To: PICLIST@mitvma.mit.edu
Subject: Re: [PIC] Multi-zone external light controller with softstart


Thanks for the comments guys, I'll keep in touch as the project starts to
roll, tempted by Dwayne 4
on 8 pins :-)

Hi again Roman, hope u r well; it's external, 'user' won't expect anything,
although part 2 could be
the internals.

I ddi consider breaking it up[ over several pics, but decided I'd ask the
expert folks on the
PIclist first! I now plan to prototype it on 877, and take it from there.
I'll develop code step by
step, see how it fares

Stuart
----- Original Message -----
From: "Roman Black" <fastvid@EZY.NET.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 04 January 2003 16:31
Subject: Re: [PIC] Multi-zone external light controller with softstart


> Stuart Meier wrote:
> >
> > I have just re-joined the list as I have a project to build a 9 zone
external light controller
(UK,
> > "230"v), driven from PIRs, push buttons at each exit door etc.
> >
> > Planning to use a 16F877 running at 20mhz, zero-crossing detection,
phase angle firing
>
>
> Hi Stuart, design it from the back first. The user is
> going to allow a decent delay after walking into the
> room before expecting the light to come on. The triacs
> etc need zero cross triggering.
>
> Why not design an int (or poll) at 100Hz, in sync with
> your mains, and do all your processing and triac
> firing there.
>
> No user is going to be unhappy with 1/100th second
> delay and it makes your software job much easier. :o)
>
> For triac phase ramping etc you can just add a delay
> after your main code event every 100Hz.
> -Roman
>
> --
> http://www.piclist.com hint: The PICList is archived three different
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>

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