Comments on: Arduino Beer Thermostat http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/ Microcontrollers Electronics Hobby Sun, 28 Mar 2010 03:07:45 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: kumar http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-735 kumar Mon, 21 Jul 2008 12:09:57 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-735 pid tempurature control pid tempurature control

]]> By: Rajnikumar http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-734 Rajnikumar Tue, 01 Jul 2008 02:52:15 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-734 First intro of me my self Rajnikumar & i am a Electronic Engineer. I have need the PID Tempreture Controller Full Information. Please Give me a details of PID Tempreture Controller give me a full Circuit diagram with working details and Programming code if it is on 'C'language Programming posible.Alos, i have to need the full Equatation of PID Tempreture Controller. Please Give me for Project help & I have to wait for positive Reply...... First intro of me my self Rajnikumar & i am a Electronic Engineer. I have need the PID Tempreture Controller Full Information. Please Give me a details of PID Tempreture Controller give me a full Circuit diagram with working details and Programming code if it is on ‘C’language Programming posible.Alos, i have to need the full Equatation of PID Tempreture Controller.

Please Give me for Project help & I have to wait for positive Reply……

]]> By: Sean Coates http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-733 Sean Coates Sun, 27 Jan 2008 18:24:43 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-733 I've update the software/hardware significantly. Details here: http://www.homebrewtalk.com/showpost.php?p=531366&postcount=15 S I’ve update the software/hardware significantly. Details here:

http://www.homebrewtalk.com/showpost.php?p=531366&postcount=15

S

]]> By: T-Mac http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-732 T-Mac Sun, 25 Nov 2007 08:06:47 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-732 Hi everybody... I read this contest what you done, and I want to ask you... Do you have C code for digital PID regulator. I must make digital PID regulator on PIC16f877A... If anybody have it, please send it to me... thankfull Hi everybody…
I read this contest what you done, and I want to ask you…
Do you have C code for digital PID regulator. I must make digital PID regulator on PIC16f877A…
If anybody have it, please send it to me…

thankfull

]]> By: Sam http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-731 Sam Sat, 24 Nov 2007 16:54:02 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-731 First of all -- this is pretty cool Sean. I have been looking for a way to control the temp on my "new" but very used refrigerator. I was going to buy an in-line thermostat, but also wanted to monitor the accuracy of the control... So then I was looking at getting a thermostat AND a weather station that I could use to monitor the control... But at a total cost of well over $100 I don't think my wife would let me. I am kind of new to electrical stuff but I think that I might be able to handle this with all of your advice (not to mention the code -- I'm definately not a programmer) In response to Russ (response number 8) -- I don't see a need to use PID control to get more precise control of the fermentation temperature. Not that accurate control of the temperature is not important -- I just think that the on/off control of the refrigeration is plenty good. Based on Sean's control chart he has about +/- 1 degree C over a 1 hour period (or about +/- 2 degree F). (I am assuming that this is the air temp) The thermal mass of the fermenting beer (most likely 5 gallons) is enormous. I would bet that the temperature of the beer changes minimally. The extremely poor heat transfer coefficient between the beer and the air in the freezer will also contribute to a more constant temperature. Also, as far as thermistor accuracy goes -- I don't see why you would need more accuracy than +/- 0.2 degree C (which is the accuracy of a low quality thermistor). I am kind of new to home brewing -- but I will give you props if you can tell the difference between a beer fermented at 53.0 degF rather than 52.8 degF. First of all — this is pretty cool Sean. I have been looking for a way to control the temp on my “new” but very used refrigerator. I was going to buy an in-line thermostat, but also wanted to monitor the accuracy of the control… So then I was looking at getting a thermostat AND a weather station that I could use to monitor the control… But at a total cost of well over $100 I don’t think my wife would let me. I am kind of new to electrical stuff but I think that I might be able to handle this with all of your advice (not to mention the code — I’m definately not a programmer)

In response to Russ (response number 8) — I don’t see a need to use PID control to get more precise control of the fermentation temperature. Not that accurate control of the temperature is not important — I just think that the on/off control of the refrigeration is plenty good. Based on Sean’s control chart he has about +/- 1 degree C over a 1 hour period (or about +/- 2 degree F). (I am assuming that this is the air temp) The thermal mass of the fermenting beer (most likely 5 gallons) is enormous. I would bet that the temperature of the beer changes minimally. The extremely poor heat transfer coefficient between the beer and the air in the freezer will also contribute to a more constant temperature. Also, as far as thermistor accuracy goes — I don’t see why you would need more accuracy than +/- 0.2 degree C (which is the accuracy of a low quality thermistor). I am kind of new to home brewing — but I will give you props if you can tell the difference between a beer fermented at 53.0 degF rather than 52.8 degF.

]]> By: Sean Coates http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-730 Sean Coates Mon, 05 Nov 2007 03:04:34 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-730 Dale, thanks! 1) I use a custom PHP script + RRDTool. If you want the source, I can share, but it's some of my ugliest code ever (-: 2) sure, you COULD set it up with a relay and only control the fridge side, but it's _much_ easier to do it with a power toggle. S Dale, thanks!

1) I use a custom PHP script + RRDTool. If you want the source, I can share, but it’s some of my ugliest code ever (-:

2) sure, you COULD set it up with a relay and only control the fridge side, but it’s _much_ easier to do it with a power toggle.

S

]]> By: Dale http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-729 Dale Thu, 01 Nov 2007 21:32:21 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-729 Sean, Nice setups! Questions: 1) How are you logging the historical data? From the Arduino sites I see that it interacts with a telnet type window. How are you saving it to a file? 2) These setups seems to toggle the power to the cooling unit. Is there a way to set it up to complete the on-off circuit to emulate the thermostat? I'm looking at a side-by-side fridge and want to keep the freezer going as a real freezer. Thanks! Sean,
Nice setups!

Questions:
1) How are you logging the historical data? From the Arduino sites I see that it interacts with a telnet type window. How are you saving it to a file?
2) These setups seems to toggle the power to the cooling unit. Is there a way to set it up to complete the on-off circuit to emulate the thermostat? I’m looking at a side-by-side fridge and want to keep the freezer going as a real freezer.

Thanks!

]]> By: Sean Coates http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-728 Sean Coates Tue, 23 Oct 2007 05:03:41 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-728 @Rich: I'm considering something with the Quantum QT Prox sensor, but I've had no time )-: @Andrew: Thanks! I just found a cheap SSR at my local electronics shop. I've seen higher-rated ones that I intend to use for my boil kettle on eBay, though. It doesn't get hot, and it handles 20A peak, but really only drives @Rich: I’m considering something with the Quantum QT Prox sensor, but I’ve had no time )-:

@Andrew: Thanks! I just found a cheap SSR at my local electronics shop. I’ve seen higher-rated ones that I intend to use for my boil kettle on eBay, though. It doesn’t get hot, and it handles 20A peak, but really only drives

]]> By: Andrew http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-727 Andrew Wed, 17 Oct 2007 04:20:42 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-727 Nice work! I'm curious as to what SSR you used? I have been looking for one that would work with the Arduino and handle > 3A @ 120V. All I have found so far is $40-50 range. Does it get hot and how many Amps is it handling? Thanks Nice work! I’m curious as to what SSR you used? I have been looking for one that would work with the Arduino and handle > 3A @ 120V. All I have found so far is $40-50 range. Does it get hot and how many Amps is it handling? Thanks

]]> By: Rich http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/comment-page-1/#comment-726 Rich Tue, 16 Oct 2007 15:28:34 +0000 http://www.uchobby.com/index.php/2007/10/08/arduino-beer-thermostat/#comment-726 I have something similar at home I made years ago. I also wanted to measure the amount of liquid dispensed or the amount of liquid in the keg so I have some kind of idea when it needs to be refilled. Not sure how to go about this. Do you have any ideas? Thanks, Rich I have something similar at home I made years ago. I also wanted to measure the amount of liquid dispensed or the amount of liquid in the keg so I have some kind of idea when it needs to be refilled. Not sure how to go about this. Do you have any ideas?

Thanks,
Rich

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