The info you provide is very terse.
“SF6” is probably http://www.sanfranroaster.com/sf-6lb <http://www.sanfranroaster.com/sf-6lb>
And “Watlow" I assume to mean http://www.watlow.com/products/controllers/temperature.cfm <http://www.watlow.com/products/controllers/temperature.cfm>
My hunch is you maybe just connected the cables without making sure that variables like baud speed, even/uneven, parity, stopbits are all set exactly the same on both ends.
SF should be providing that info / assistance in their manuals / service desk.
Frans
> Op 29 sep. 2015, om 02:28 heeft Nate White <wcrcompany(a)gmail.com> het volgende geschreven:
>
> Which is Modbus Error: readfloat() Modbus Error: [connection] failed to connect [rtu baud[9600]] Aline 23885
>
> This is on an SF6 with Watlow. I'm sure this is a stupid question, my apologies.
>
> Nate
> _______________________________________________
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> Artisan-User(a)lists.einfachkaffee.de
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Hi Sean,
My head was full of a jumble of things related to this so I went to play with two young kids for a while to help sort it all out. The sensors themselves limit the accuracy to a couple of degrees so the high resolution of the output voltage across the precision resistor and the ADC don't much matter (i.e. they won't add to the basic inaccuracy). Whether I use a lookup table or run the equation for each temperature determination doesn't matter. My 4 1/2 digit DMM is pretty good so I've probably got the precision resistor to 0.1%. It'll be OK.
If I'm going to do something with a guide for others I'll have to learn a lot more first. But maybe I'm getting a start.
From the script you used writing Happy New Year about the Lunar New Year looks like you're in the south of Asia. I'm in the north of China, on the east side. I use green beans from Yunnan Province in the south.
Do you have a simple way to offset the 1v floor (from the 4mA minimum) of the 4-20mA current loop output to 0 volts? Just for fun (for some reason I don't see the Agtron as a fun project).
woody
Sean,
Thanks for passing on your hard-won experience. I got a proof-of-concept 4-20mA current loop working today so I'm a little ahead. This industrial standard, by the way, doesn't pass 20mA through the sensors. As I understand the sensor module, it passes just under 1mA through the PT-100, in regards to the possible self-heating problem. It then provides a voltage output across an external resistor (maybe 250 ohms) which I'll try to adjust to 0-4 v for the module full range of 0-250 C. (The module itself has two adjustments which I don't quite understand yet.) Then this will feed an ADS1115 ADC chip to go into the Raspberry Pi. I've already tested with a lower-resolution version of that chip so maybe I'll be OK. The adafruit page you sent refers to this same ADC breakout board.
I stumbled across the 4-20mA current loop idea (which runs on 24vdc or maybe 12) strictly by chance. Modules for it kept coming up when I was looking for PT-100 probes so I checked it out. The driver modules (little round blue jobbies) are quite reasonably priced, as are the other parts I'm using. Nothing at all expensive - I like doing things that way and for me it's more fun.
As for calibration, tables are now available calculated using the Callendar Van Dusen equation to compensate for the nonlinearity of the PT-100. I'll calibrate at freezing and boiling and adjust the table by that. Thermocouples are not very accurate and I think I'll be fine with this setup. We'll see.
If ever you're up against using a PT-100 again this might be the way to go.
Best wishes,
woody
Thanks, Sean,
for bringing up a simpler alternative. You've got me thinking and that's good (I hope!). I have a few days while I'm working out the 4-20mA current loop part of it. Right now I'm thinking along the lines of: PT-100 sensor with good thermal contact on the outside of the pot side (sheet metal shield below to deflect any direct rising burner heat from the sensor and lead wires), and have the sensor covered by a good low thermal mass insulator (what that will be I don't know yet).
I was concerned about how I would calibrate the 4-20mA current loop but I think I have that figured out now. Work in the coming days should answer a lot of my questions.
Best,
woody
Friends,
As I am setting up my own temperature probes on a very simple home roasting set-up, I have a lot of flexibility as to where I put the environment temperature probe. The bean temperature probe is in the whisk I use for stirring.
Presently I have no shell or cover around my set-up. I have (from bottom to top)
(1) a gas hot plate, which heats a
(2) cast iron pot with ≈20cm top opening, in which rests a
(3) heavy wire mesh strainer (25cm diameter) holding my 280gms green beans, stirred with a
(4) wire whisk carrying a temperature probe, on a handle extension.
My thought is to drill a hole in the side of the cast iron pot and put a temperature probe inside there to measure the environmental temperature. Or, I might add a 20cm or so diameter metal disc somewhat above the strainer and measure something more like the exhaust temperature. I stir constantly so there needs to be ≈30cm open space above the strainer and beans.
Thoughts or suggestions?
Thanks,
woody
i have managed to figure out that i have omron e5cc temperature controllers/pids.
they are modbus compatible. one for bt , one for et.
linked by a usb/serial converter.
can anyone help me with connecting to this?
please advise.
kind regards
Rhys
Hi Aaron,
Can you perhaps share what and how you did this?
I managed to install Artisan on my Pi 3 yesterday and a was able to read ET via a Mastech MS6514, but I'm now trying to figure out how I can control the heater via Artisan's PID and PWM.
Thanks!
Marc
Op 26 jan. 2017, om 04:41 heeft Aaron Skeen <akskeen(a)gmail.com> het volgende geschreven:
I too have had great success with a RPI 3 and Phidgets.
Aaron
On Wed, Jan 25, 2017, 8:23 AM Azis Muslim KEIMARK <nawawi(a)zis.co.id <mailto:nawawi@zis.co.id>> wrote:
Hi Woody,
I know I'm not alone doing this.. I successfully running artisan roaster scope on my pi and testing almost all artisan features.
Glad to hear from your side of experience deploying artisan on raspi...
Best regards
azm
On Wed, Jan 25, 2017 at 6:00 PM, <artisan-user-request(a)lists.einfachkaffee.de <mailto:artisan-user-request@lists.einfachkaffee.de>> wrote:
Send Artisan-User mailing list submissions to
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. Re: availability (Woodson Gannaway)
2. trouble connecting (Farm road), Re: trouble connecting (Farm road)
3. Re: trouble connecting (Farm road), Re: trouble connecting (Susan)
4. Re: availability (Marko Luther)
----------------------------------------------------------------------
Message: 1
Date: Wed, 25 Jan 2017 07:11:34 +0800
From: Woodson Gannaway <wtg12345(a)me.com <mailto:wtg12345@me.com>>
Subject: Re: [Artisan-user] availability
To: artisan-user(a)lists.einfachkaffee.de <mailto:artisan-user@lists.einfachkaffee.de>
Message-ID: <B886ED66-C095-4EBC-85B8-51608F9BBB52(a)me.com <mailto:B886ED66-C095-4EBC-85B8-51608F9BBB52@me.com>>
Content-Type: text/plain; charset=us-ascii
To whom it may concern:
Friends - Yesterday I was able to download the v1.0.0b4 for the Raspberry Pi and now have it on my B2+ to look at. If somebody did something - Thanks!
From reading part of the archives, a month of this list and a quick look through the source for "external program" ; you all are doing something at a high level achieved only rarely. Hats off!
That being said, now I'll get to work on my temperature sensors and see if I can feed my data in. May be slow, often my work seems like slow motion. Looking forward to it.
Best wishes,
woody
------------------------------
Message: 2
Date: Wed, 25 Jan 2017 13:04:18 +1300
From: "Farm road" <farmrd(a)slingshot.co.nz <mailto:farmrd@slingshot.co.nz>>
Subject: [Artisan-user] trouble connecting (Farm road), Re: trouble
connecting
To: <artisan-user(a)lists.einfachkaffee.de <mailto:artisan-user@lists.einfachkaffee.de>>
Message-ID: <D75565870C224514B7F58BA0F996D214@pcPC>
Content-Type: text/plain; charset="iso-8859-1"
hi again
when you say meter, do you mean the part that the usb cable plugs into?
or the actual temperature controllers on the side of the roaster with the displays on them?
I too have had great success with a RPI 3 and Phidgets.
Aaron
On Wed, Jan 25, 2017, 8:23 AM Azis Muslim KEIMARK <nawawi(a)zis.co.id> wrote:
> Hi Woody,
>
> I know I'm not alone doing this.. I successfully running artisan roaster
> scope on my pi and testing almost all artisan features.
>
> Glad to hear from your side of experience deploying artisan on raspi...
>
>
> Best regards
>
> azm
>
>
> On Wed, Jan 25, 2017 at 6:00 PM, <
> artisan-user-request(a)lists.einfachkaffee.de> wrote:
>
> Send Artisan-User mailing list submissions to
> artisan-user(a)lists.einfachkaffee.de
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://lists.mokelbu.de/listinfo/artisan-user
> or, via email, send a message with subject or body 'help' to
> artisan-user-request(a)lists.einfachkaffee.de
>
> You can reach the person managing the list at
> artisan-user-owner(a)lists.einfachkaffee.de
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Artisan-User digest..."
>
>
> Today's Topics:
>
> 1. Re: availability (Woodson Gannaway)
> 2. trouble connecting (Farm road), Re: trouble connecting (Farm road)
> 3. Re: trouble connecting (Farm road), Re: trouble connecting (Susan)
> 4. Re: availability (Marko Luther)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 25 Jan 2017 07:11:34 +0800
> From: Woodson Gannaway <wtg12345(a)me.com>
> Subject: Re: [Artisan-user] availability
> To: artisan-user(a)lists.einfachkaffee.de
> Message-ID: <B886ED66-C095-4EBC-85B8-51608F9BBB52(a)me.com>
> Content-Type: text/plain; charset=us-ascii
>
> To whom it may concern:
>
> Friends - Yesterday I was able to download the v1.0.0b4 for the Raspberry
> Pi and now have it on my B2+ to look at. If somebody did something - Thanks!
>
> From reading part of the archives, a month of this list and a quick look
> through the source for "external program" ; you all are doing something at
> a high level achieved only rarely. Hats off!
>
> That being said, now I'll get to work on my temperature sensors and see if
> I can feed my data in. May be slow, often my work seems like slow motion.
> Looking forward to it.
>
> Best wishes,
> woody
>
> ------------------------------
>
> Message: 2
> Date: Wed, 25 Jan 2017 13:04:18 +1300
> From: "Farm road" <farmrd(a)slingshot.co.nz>
> Subject: [Artisan-user] trouble connecting (Farm road), Re: trouble
> connecting
> To: <artisan-user(a)lists.einfachkaffee.de>
> Message-ID: <D75565870C224514B7F58BA0F996D214@pcPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> hi again
>
> when you say meter, do you mean the part that the usb cable plugs into?
> or the actual temperature controllers on the side of the roaster with the
> displays on them?
>
Hi Woody,
I know I'm not alone doing this.. I successfully running artisan roaster
scope on my pi and testing almost all artisan features.
Glad to hear from your side of experience deploying artisan on raspi...
Best regards
azm
On Wed, Jan 25, 2017 at 6:00 PM, <
artisan-user-request(a)lists.einfachkaffee.de> wrote:
> Send Artisan-User mailing list submissions to
> artisan-user(a)lists.einfachkaffee.de
>
> To subscribe or unsubscribe via the World Wide Web, visit
> https://lists.mokelbu.de/listinfo/artisan-user
> or, via email, send a message with subject or body 'help' to
> artisan-user-request(a)lists.einfachkaffee.de
>
> You can reach the person managing the list at
> artisan-user-owner(a)lists.einfachkaffee.de
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Artisan-User digest..."
>
>
> Today's Topics:
>
> 1. Re: availability (Woodson Gannaway)
> 2. trouble connecting (Farm road), Re: trouble connecting (Farm road)
> 3. Re: trouble connecting (Farm road), Re: trouble connecting (Susan)
> 4. Re: availability (Marko Luther)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 25 Jan 2017 07:11:34 +0800
> From: Woodson Gannaway <wtg12345(a)me.com>
> Subject: Re: [Artisan-user] availability
> To: artisan-user(a)lists.einfachkaffee.de
> Message-ID: <B886ED66-C095-4EBC-85B8-51608F9BBB52(a)me.com>
> Content-Type: text/plain; charset=us-ascii
>
> To whom it may concern:
>
> Friends - Yesterday I was able to download the v1.0.0b4 for the Raspberry
> Pi and now have it on my B2+ to look at. If somebody did something - Thanks!
>
> From reading part of the archives, a month of this list and a quick look
> through the source for "external program" ; you all are doing something at
> a high level achieved only rarely. Hats off!
>
> That being said, now I'll get to work on my temperature sensors and see if
> I can feed my data in. May be slow, often my work seems like slow motion.
> Looking forward to it.
>
> Best wishes,
> woody
>
> ------------------------------
>
> Message: 2
> Date: Wed, 25 Jan 2017 13:04:18 +1300
> From: "Farm road" <farmrd(a)slingshot.co.nz>
> Subject: [Artisan-user] trouble connecting (Farm road), Re: trouble
> connecting
> To: <artisan-user(a)lists.einfachkaffee.de>
> Message-ID: <D75565870C224514B7F58BA0F996D214@pcPC>
> Content-Type: text/plain; charset="iso-8859-1"
>
> hi again
>
> when you say meter, do you mean the part that the usb cable plugs into?
> or the actual temperature controllers on the side of the roaster with the
> displays on them?
>
