Sorry If this has been answered already. I did look, honest! But my brain started hurting too much.
I recently purchased a TC4C with Artisan preloaded http://code.googl...c4-shield/. I will be using this with my popper based roaster that has a simple pid control for the heating element and manual fan control. So far I have two thermocouples connected to the TC4 and working properly in Artisan and now want to connect to the SSR that controls the heating element, eliminating the old PID. The SSR connection seems obvious (OT1). But I can’t sort out how to control the heater using artisan. As I look through the information available on line and in the forum posts artisan documents http://code.googl...p/artisan/ the focus seems to be on the monitoring side of the equation. However, I want to look at the control of the burner using TC4C/Artisan for control. Is this possible or did I misunderstand the capability. So far I cannot find anything about setting up a roast time vs temp profile or PID function using Artisan.
Someone square me away please
Robert
Hi Robert, I think the code is currently only setup to monitor, so you need to attach a potentiometer to the analog in port, and you manually turn the knob to adjust the level (I don't use artisan yet, I'm still on aCatuai which is setup in this way).
The command you will use to control an SSR that is connected to OT1 is in the form of "OT1,75". The OT1 command sets the duty cycle or output level to a value between 0 and 100%. In the example, it would set it to 75%.
To make Artisan send this command to the TC4C you must configure an event button. While running Artisan, select Config | Events... | Buttons to access a table of defined buttons.
To create a button for 75% heater output you would set up a button as follows:
Label: HTR-75
Description: 75% heater
Type: Power
Value: 3 (I'm not sure what this does??)
Action: Serial command
Documentation: OT1,75
Visibility: On
Color: (I left this alone and got yellow buttons)
Set up similar buttons for HTR-0, HTR-25, HTR-50, and HTR-100.
The new event buttons will show up at the bottom of the screen each time you load Artisan. Make sure you set up a 0% output button or you will be unable to turn off the heater at the end of an Artisan session :-)
Thanks to both of you!
Jim, I take it that when roasting I will manually(ish) control the roast with the new event buttons. Will the button events be recorded on the graph along with the other data?
Thanks again
Robert
I re-read the TC4/artisan thread looking to see if you can view rate of rise in real time and not just via the graph display. Is this available in the latest version?
This would be a real nice package being able to utilize event buttons and being able to view a real time RoR numeric display.
Allen
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
RoR is displayed on the PC screen by Artisan. It is labeled Delta-BT and Delta-ET.
But with the current aArtisan TC4 sketch, RoR is not displayed on an attached LCD. Instead, the space where RoR might be shown is used to echo the commands received from Artisan.
Artisan works a little differently than other applications that we support with the TC4. The difference is that Artisan polls the TC4 when it is ready for a new reading so computing RoR by the TC4 is a little more complicated.
There are other TC4 applications that display RoR on an attached LCD, but aArtisan does not.
If there is enough interest, though, I can add this feature to aArtisan?
Robert H wrote:
Will the button events be recorded on the graph along with the other data?
Yes. But a word of caution: on some computers adding markers to the graph tends to bog down Artisan and cause some lags in response.
Jim
I noticed that lag of response comes from high default sample frequency. If temperature measurement is set to 3-5 seconds, which is plenty for roasting application, even less powerful computers should be fine. I never looked at the code, but it feels like the IO is running in the main working thread. Real solution would be to run IO, or graphing, in separate threads.
Sorry If this has been answered already. I did look, honest! But my brain started hurting too much.
I recently purchased a TC4C with Artisan preloaded http://code.googl...c4-shield/. I will be using this with my popper based roaster that has a simple pid control for the heating element and manual fan control. So far I have two thermocouples connected to the TC4 and working properly in Artisan and now want to connect to the SSR that controls the heating element, eliminating the old PID. The SSR connection seems obvious (OT1). But I can’t sort out how to control the heater using artisan. As I look through the information available on line and in the forum posts artisan documents http://code.googl...p/artisan/ the focus seems to be on the monitoring side of the equation. However, I want to look at the control of the burner using TC4C/Artisan for control. Is this possible or did I misunderstand the capability. So far I cannot find anything about setting up a roast time vs temp profile or PID function using Artisan.
Someone square me away please
Robert
Hi Robert,
I've been developing and using a variant of aArtisan that can control a heater using a PID library and temperature/time profiles stored on the TC4s eeprom.
I can attest to folks being out and about. Me and Julie were out hitting the garden centers for loading flower pots all day. Nice weather! Tomorrow the Kamado/egg gets fired up!
ginny
05/18/2013 17:32
Jack, it is quiet today, I think the lovely day has folks out and about.
ginny
05/18/2013 17:31
sbonder
thanks for joining us...
JackH
05/18/2013 15:28
Quiet here today.
zombie coffee
05/17/2013 11:02
ricksroasters
thank you for taking time to join us...
allenb
05/15/2013 15:56
nikijack Howdy and Welcome to HRO!
freshbeans
05/15/2013 13:57
FataMorganaCafe
ginny
05/15/2013 03:04
blong2001 thanks for joining us...
ginny
05/14/2013 13:54
that is sweet... thanks for posting lylabrown...
for you
Marco.....
thanks for joining.
for you