DIY Kiln Controller

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Hi - just wondered if anyone has come across any diy plans for an
electric kiln controller using an embedded controller?


I'm in the process of trying to make one, but it would be nice to see
some others for comparison.


Regards

Jules




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Jules


Re: DIY Kiln Controller
On Wed, 16 Feb 2011 15:44:26 +0000, Jules

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No, but I've thought about it.  I was thinking more along
the lines of putting an old PC to use for this, since I have
a bunch on hand, and also I could have it plot out
temperature versus time.

The main drawback for me is that modern Windows PCs have no
easy-to-use I/O (parallel port), and older DOS units would
be more trouble to program... and more pointless, if I
wanted to share the plans with others who were not similarly
endowed with a computer graveyard.

However, I have developed a circuit to use a Windows sound
card to read thermocouples (see
<http://www.daqarta.com/dw_kkjj.htm ), and it will probably
be fairly easy to get the sound card output to control the
elements.  

Since all this involves circuit contruction, it probably
will appeal only to the most die-hard tinkerers.  I think
your idea of using an embedded controller makes a lot more
sense, though.

Best regards,


Bob Masta
 
              DAQARTA  v6.00
   Data AcQuisition And Real-Time Analysis
              www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, FREE Signal Generator
           Pitch Track, Pitch-to-MIDI
          Science with your sound card!

Re: DIY Kiln Controller

hi Bob thanks for your reply,  i know what you mean by old PCs’ seem
less hassle to interface than new ones. I was thinking of using a modern
PC running some software to monitor the kilns progress etc but the PC
would not be allowed to interfere with the kilns operation.


I’ve seen a few examples of people using a pre-built temperature module
then adding a thermocouple then just connecting it up to the elements,
but I want to control the heat ramp / soaks etc.


Regards

Jules




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Jules


Re: DIY Kiln Controller

sry for the simple scribble, this is what i've built, i'm ready to do
some simple low temp curve tests this week, i'll let you know how i get
on.

Regards

Jules


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Jules


Re: DIY Kiln Controller

Just done some low current switching tests; starting to get there now;
still a few more tests / code revisions to make before it's ready to
hook up to the kiln elements. I'll probably test by cooking a potato on
a custom 3 segment ramp ;-)


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Jules


Re: DIY Kiln Controller

Jules;876392 Wrote:
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It's been a few days but No I haven't given up;-), still doing tests and
code additions / revisions. I want a core set of kiln controller
functionality before I set onto a pcb.

The functionality I want is..

(1) 10 internal preset programs (for pottery)
(2) clock set
(3) start delay
(3) set vent
(4) alarm options
(5) power trip restart
(6) firing program logging
(7) ability to upload / download programs / logs to a smartphone / pc
software


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Jules

Re: DIY Kiln Controller
On Wed, 9 Mar 2011 10:03:02 +0000, Jules

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Sounds great!  Have you got a thermocouple system worked out
yet?  I haven't looked into what's available (or affordable)
off-the-shelf for easy interfacing to a controller.  

I suppose if your controller has 2 A/D inputs you could use
one for the TC and one for a reference junction measurement,
and do the corrections in software.

Best regards,


Bob Masta
 
              DAQARTA  v6.00
   Data AcQuisition And Real-Time Analysis
              www.daqarta.com
Scope, Spectrum, Spectrogram, Sound Level Meter
    Frequency Counter, FREE Signal Generator
           Pitch Track, Pitch-to-MIDI
          Science with your sound card!

Re: DIY Kiln Controller

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Yes, I'm using the K-type with the AD595; expensive but less hassle, the
Ad595 has it's own cold-point compensation;
I had small problem with noise but I made it stable by filtering it out
in software,
hopefully this will remain so when switching the 21 amps on/off.
I also have an offset table for +- adjustment for trimming if required.


I'd like not to use the AD595 as it's quite expensive as chips go; my
idea is to use as few components
as possible and make it as cheap as possible.

The interface side i'm not decided yet, after seeing your site I was
thinking of using a
simple audio jack to send data back and forth, as even modern computers
have them and a audio jack cable is very cheap to buy.

I'm not an electronics engineer so all this is new to me.


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Jules

Re: DIY Kiln Controller

Tested and works fine :-) I Just need to create the pcb artwork and then
put onto a pcb then into a box and make all the kiln connections tidy.

If anyone would like to build such a device, let me know, if there is a
good amount of interest I'll sort something out.


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Jules

Re: DIY Kiln Controller

Jules,
I am also interested in doing this on a old kiln I have with just a kiln
setter.  I was looking on ebay and found this: "Temperature Controller
PID Kiln Ramp Soak 64-Setpoints"  which along with this: "SSR25A SOLID
STATE RELAY for PID Temperature Controller" might just do the trick.
Together they go for around a $100.  What do you think?
Zard

Jules;875961 Wrote:
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Zard

Re: DIY Kiln Controller

Zard;879023 Wrote:
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Hi Zard,
I looked into PID units but I personally wanted something
custom for myself. Try and google info on setting these up
or ask someone who has one already setup and running.

My Kiln is an old one that had a kiln sitter. The kiln draws
around 21.8 Amps, i'm using 3 x 80A SSRs mounted on
heatsinks with an old computer fan, so if one fails and locks-on
I always have a backup SSR to turn it all off.

Regards

Jules


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Jules

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