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Daniel I too use an electric (SmokinTex 1400) and am trying to develop with an Arduino Mega. I'll be interested in your ideas and implementations. Curt

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">If the arc tan thing doesn't work as well as you like you can build a lookup table. </div></BLOCKQUOTE> I used the trig function that most closely resembled the plot that I...

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Miguel Drake: OK, it looks like you are implementing three things here, first a non-linear proportional control, a time integral control with adaptive...

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Miguel Drake: I see. Interesting, it seems that you are building a proportional control with Kff in the form of a nonlinear transfer function. Are you...

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Miguel Drake: Math heavy but comprehensible. For those designing their own auto tune or tuning themselves here is a resource...

Bravo! Many times the lower tech solution is neglected even though it turns out to be a better one. Have you tried different sized fans? I suspect you should be able to use a much smaller fan. How about windy conditions, does this cause a problem? Curt

I have a K-type purchased from www.auberins.com. It will probably be used with an AD595 (I'm not a hardware guy). Could you start a new thread, this one is already loaded with information. Curt

I am working on an Arduino based controller now. It is not PID based but adding PID logic would be fairly easy. My orientation is software so a collaboration with hardware experts would be very useful. Curt

You can buy a Stoker without a blower - I did this to monitor my electric smoker. Curt

Thanks for the quick response. Does this probe interface directly with the Arduino? Any other hardware required? Curt

I am following your projects with interest because I am working on a similar project for an electric smoker. It is being developed on a Mega2560 with an ethernet shield. What pit/food temperature sensors do you think work best with the Arduino for this application? Keep up the good work, Curt

You guys are getting close to requiring a programmable (script driven) controller. Adding these features is usually much easier than providing the user interface to set all of the parameters. One feature I want to try was having the pit temperature be some minimum (eg 50 degrees) warmer than...

Stew Your problem may be output buffering. Place the following code after the open: <pre class="ip-ubbcode-code-pre"> $| = 1 ;</pre> this will flush the buffer after each print command. Curt

Here is a simple way to handle that: use Getopt::Long ; my $OUT ; my $OutFileName = '' ; GetOptions ( 'outfile=s' => \$OutFileName , ) or die ("Getoption $!") ; if ($OutFileName) { open ($OUT, ">> $OutFileName") ; } else { $OUT = *STDOUT ; } ##...

I'm not sure of everything you did but the output from both lines of code goes to the same place (STDOUT, the default). If you need a separate output use STDERR for non-data output. You shouldn't have to use any select's in this application. Curt

Try this: <pre class="ip-ubbcode-code-pre"> # iterate over each blower in the JSON structure: my $blower_count = 0; foreach my $blowers(@{$json_text->{stoker}->{blowers}}){ # create an array of blowers information: @blower = ("$blowers->{name},$blowers->{on},")...

Stew, Possibly the first '@sensors' value in the foreach loop has null values. Use Dumper on each @sensors result to determine what is being returned. Debugging through a forum is a real challenge. Curt

Stew Just a quick suggestion. Include: use Data:: Dumper ; $Data:: Dumper::Indent = 1 ; with the other 'use' declarations. Then: print Dumper (\@array_of_sensors) ; to show exactly what is in this array, in Perl format. Also - whenever you are getting data from an external source, you have...

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Joe Keenan: Interesting question. Is the beta really beta? What's installed on new units these days? joe </div></BLOCKQUOTE> I'm not sure. When I...

Here is a perl module that connects to the Stoker and returns JSON (similar to the beta version) formatted readings. stoker module If you don't have perl, the regular expression may be useful. Curt