My end goal if I get that far would be to control them all
individually but as a first step I am aiming to control the entire
kiln. The main advantage is I don;t have to disassemble my wife's
kiln. I am thinking she will be reluctant to go along with this
before a proof of concept Thanks for the link I will check it out.
John
On Aug 10, 9:06 am,
te...@terryking.us wrote:
> Hi, Been travelling and just saw the discussion.
> - Doesn't this large
> kiln have separate connections to different sets of elements? If so, you might
> consider separate relays for each section, giving you both some options for
> control, and decreasing the current rating of the relays.
> - I source
> relay boards from China and I will look at what high-current relays I can get
> at a good price.� I would like to support kiln applications as well as all the
> home automation and aquarium etc. guys. I will research that in a couple of
> days when I get home..
> - Control Software: I would lean toward the
> approach of the CNC machining guys and use an Arduino for the direct 24/7
> control, with simple battery backup through power failures.� The host computer
> can be used to set up the run profiles and timings, and for graphical results
> etc.��A few years ago I researched Warm Glass and wrote some PC software,
> including defining a Kiln Control Language which included sensing actual
> temperatures, venting, etc.� But I never actually implemented it.� But I'd be
> interested in collaborating on the Arduino and software part from a distance.
>
> I'm from Vermont USA but I'll be living and designing Arduino stuff in
> Italy next year. I'll dig out my notes when I get home..http://arduino-info.wikispaces.com/ArduinoPower�
> has some of my stuff on power. Need bigger relays is all :-)
> Regards,
> Terry King
>
te...@yourduino.com> I am
>
> running it off a dryer outlet. This kiln is 208V @ 24A.> Obviously I
>
> am not running it at 208V but as I understand it from> several kiln
>
> pages as long as I don;t fire it up to cone 10 or so I> won;t
>
> dramatically shorten the element lives. Ultimately I would like> to
>
> control a 240V 45A kiln. I have been looking for a resonably> priced
>
> relay that I can control.
>
>
>
> > On Aug 8, 10:02�pm, Socoj2
> <
soc...@gmail.com> wrote:
> >> Your thinking low power DC...
>
> >> Think 240 volt AC @ 20 amps.
>
> >> You can pump that through a single relay.. Ok a really big one but
> >> still...
>
> >> John, what kind of Draw
>
> does your Kiln have?
>
> >> im guessing 240 and you are
>
> running on a dryer circuit so less than 30
>
> >> amps?
>
> >> tip220 Transistor controlling a fairly large 240vac Relay
> should be a
> >> piece of cake.
>
> >> I
>
> think arduino actually has a relay shield you could run the Relay>> off?
>
> >> i assume you want to take a temp
>
> value and adjust based on the>> arduino?
>
> >> we could probably knock this circuit out in a couple hours if you
> have
> >> a specs on the sensor and the heating element draw?
>
> >> On Aug 8, 5:57�pm, obscurity
> <
wei...@slamcoll.com> wrote:
>
> >> > yeah it gets pretty hot. �It made my laundry
>
> room close to 100 deg F>> > and took more than 12 hours to
>
> cool down and that was only 2,200 deg
>
> >> > F.
>
> >> > On Aug 8, 5:15�pm, Isaac Dover
> <
isaacdo...@gmail.com> wrote:
>
> Holy cow - that's twice the melting point of aluminum. I had no clue,>> this
> >> > > is way out of my league. You don't
>
> need a microcontroller, you need one
>
> >> of
>
> > the X-Men.
>
> >> > > Isaac
>
> >> > > On Mon, Aug 8, 2011 at 4:52 PM, obscurity
> <
wei...@slamcoll.com> wrote:
> >> > > > I could
>
> probably learn a lot from electric stoves but they do not get
>
> > > > hot enough. �Ideally I would like the controller to work up to
> >> > > > �> On Mon, Aug 8, 2011 at 2:48 PM, obscurity
>
> <
wei...@slamcoll.com>>> wrote:
>
> > > > Hey Isaac!!
>
> > I would like to set it up so I can design a profile for firing and
> >> > > > > > then have the kiln attempt to follow it.
>
> �I guess at that point it>> > > > > > will be a
>
> PID controller since it will need to follow some rules
>
> >> as it
> >> > > > > > tries to mimic the profile. �In the
>
> first iteration I am just>> going to
>
> > > > try turning the entire kiln on and off but eventually I would
> like
> >> to
> >> > > > > > control the
>
> coils independently so I can tune the different areas>> of
> >> > > > > > the kiln to keep the temperature
>
> consistent throughout. �I have>> > > > > > ordered
>
> a few Max6675 and I slightly higher temperature equivalent
>
> > > > > through Maxims samples program. �With that stuff I will at
> least
> >> be
> >> > > > > > able to build
>
> a pyrometer so I can tell what is going on inside>> the
> >> > > > > > kiln. �I still need to figure out what
>
> relay I need in order to>> > > > > > control 240V
>
> at about 30A. �Ultimately I will need to go up to 50A>> but
> > > I've been thinking about an arduino kiln controller. �Does
> >> anyone
> >> > > > have
>
> > > > > > any experience with similar projects? �I have seen
> several
> >> posts on
>
> > arduino.cc but most have not finished the projects. �It would
> >> need
> >> > > > to
>
> > > > > control 240V 30A or higher power. I am thinking that it
> should
> >> be
> >> > > > able
>
> > > > > > > > to program and store preprogrammed firing
> profiles ideally
> >> without
> >> > > > the
> >> > > > > > > > use of an attached computer. �As
>
> a bonus it would be ideal if>> it
>
> would
> >> > > > > > > > also allow the option
>
> of using the existing kilnsitter. when>> you
>
> > > don't
> >> > > > > > > > want the
>
> complexity of the controller. �A later modifcation>> might
> >> > > > be
>
> to make it a mulltizone device controlling each coil
>
> individually.
>
> John
>
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