[SS2S-Main] Re: temperature controller with arduino

  • From: Vicente Alvero Zambrano <vicente_alvero_14@xxxxxxxxxxx>
  • To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
  • Date: Sun, 22 Jun 2014 11:47:55 +0200

Hi Tim,
Unfortunately, we can not spend $ 180 on this system. On the other hand, given 
that the PID is the best option, we can opt for this. 
We have a PID we bought last year. PID is REX-C700. I also have a thermocouple 
type K 2 meters in length. So we can use this. 
Now the question is, what fan?, What resistance?, What power? 
Opinions?, Comments?

From: tyoung489@xxxxxxxxx
Date: Sat, 21 Jun 2014 21:04:29 -0700
Subject: [SS2S-Main] Re: temperature controller with arduino
To: sugarshot@xxxxxxxxxxxxx


Depending on how you locate the heaters you may find that you'll have 
problems maintaining uniform temperature throughout the oven with your 
planned dimensions of 2 x0.5 x 0.5 m (Free).  Long oven shapes are more 
difficult to keep at a uniform temperature.   Long oven can be beneficial if 
you have a process that requires different temperatures along the route 
through the oven tunnel.   In a tunnel oven you are normally applying spot heat 
directly or via infrared.   


In a convection oven, like what you want, the heat is applied indirectly
 via the surrounding medium, air in this case.   Normally the heat 
source is not directly in the area with the product your heating. You want 
some heat barrier (wood, steel, or aluminum plate) between it & the product to 
avoid spot heating.   Larger ovens would use a supply fan with 
additional stirring fans to maintain uniform temperature.


Just for consideration.  This could all be inside your plywood & 
foam box. Heater section with stir fan(s) -> Aluminum plate barrier to 
direct heating -> oven space with stir fan(s).   Also you can often get lower 
cost fans if the motor is mounted outside the oven with only the blade in the 
heated space.

The control portion of your job requires nothing unique that requires 
new research or development efforts.   This is a straight forward case 
of application engineering for this cure oven.   

 seems to me that with the Arduino you're starting from scratch to 
re-develop the wheel.  This may be fun but is unnecessary with the 
abundance of low cost, off the shelf controllers, & software 
available.  Granted these weren't available 20-years ago but neither was
 the Arduino.   The design, testing,  & debugging of the software 
interface for the controller is where 
you'll be spending or wasting your time, depending upon the results.

The BCS-460 is a fully debugged Temperature Controller with Everything you want 
& much more. $180. 

Graphical, Web, & Smart Phone Software Interface.

8 Programmable outputs each with 8-stages. 

4 Sensor inputs

  You can pre-program & also interact with the settings on the fly.


    Graphics Screenshots


The BCS-460 has 4 temp sensor inputs.   These are any ntc 10k ohm 
thermistor that you can get 100 for $8 plus shipping online or $0.75ea 
plus shipping from SparkFun.

For your curing operation you will want to know the temperature of the 
part, not just the oven temperature.   What is often done is to use a 
scrap or dummy piece of what you are curing & embed the sensor at 
the spot that the temperature is most critical to sense

BCS-460 Controller  Graphical, Web, & Smart Phone Software Interface
 (These will do what you ask of them. Don't get tripped-up by what 
they're called. Curing a composite part is less sophisticated than running a


iPhone Interface Demo


Software Documentation


Other Electronics starting around $15 (some of these have the ability to output 
to your computer some come with software)


On Sat, Jun 21, 2014 at 4:02 AM, Vicente Alvero Zambrano 
<vicente_alvero_14@xxxxxxxxxxx> wrote:

The main idea is to made a home oven from plywood and foam insulation. I 
planned dimensions of 2 x0.5 x 0.5 m (Free). With these dimensions we can cure 
any parts necessary for SS2S project. Recall that the largest piece so far is 
the nosecone (1507 mm). 

For smaller piece, and in order not to waste energy, I have thought the 
manufacture of a partition. 
You're right about the fans. I'm sure I can get some free fan oven, as well as 

The objective of using arduino, is the possibility of developing a graphical 
interface in which to determine the temperature rangesSubject: [SS2S-Main] Re: 
temperature controller with arduino

From: tyoung489@xxxxxxxxx
Date: Fri, 20 Jun 2014 17:30:38 -0700
To: sugarshot@xxxxxxxxxxxxx

As much fun as it is to play with Arduinos it's a waste of time & 
money.Programmable PID Temperature Controller with single or dual sensors can 
be purchased on eBay for $15-$60. 

Where will you be placing the temperature sensor for the controller, embedded 
in the part or on the surface? Or are you going to try to run the oven at the 
desired temperature and guesstimate the time it takes for the part to 
equilibrate? I believe that would problematic and take longer to achieve your 
cure. I think that the manufacture of the composite materials should be able & 
more than willing to provide you with general propose curing methods & 

Are you building your own over with strip heaters, fans, etc? Or are you 
planing to interface the controller and fans to an existing oven?
For convection circulation you only need constant speed fans and if you plan on 
using axial flow computer type fans be aware most are rated to 60-C or  70-C.  

You can get 105-C rated fans but not from an old computer. sofasco.com is one 
of many places you can get them. You could use standard fans but it anyone's 
guess on how long they'll last.

If the parts are small you can buy small electric convection ovens sold as 
Toster/Pizza ovens.Check Walmart, Best Buy, Target, eBay, Amazon.

Sent by Timothy Young                iPad

On Jun 20, 2014, at 4:01 PM, Vicente Alvero Zambrano 
<vicente_alvero_14@xxxxxxxxxxx> wrote:

Florin that's perfect. The system must be simple (as cheap as possible). With a 
source of heating (resistance) and several computer fans to circulate the air. 
Arduino must be able to control the temperature (using the resistance and the 
fan) according to a predefined schedule. A program is for example: 

20 ° C to 100 ° C by increments of 20 ° C / h. 5 hours at 100 ° C. 100 ° C at 
20 ° C with a decrease of 20 ° C. Ideally develop a graphical interface to vary 
these parameters at will.

Date: Sat, 21 Jun 2014 01:32:37 +0300
Subject: [SS2S-Main] Re: temperature controller with arduino
From: florin.mingireanu82@xxxxxxxxx

To: sugarshot@xxxxxxxxxxxxx

I can help with the temperature controller but I would need more precise 
specifications: like temperature range, control "band" etc.

On Fri, Jun 20, 2014 at 10:16 PM, Vicente Alvero Zambrano 
<vicente_alvero_14@xxxxxxxxxxx> wrote:

Hi,Anyone know how to make a temperature controller with arduino to make a home 
oven to cure composite? The idea is to monitor several computer fans and 
thermal resistances. Must be able to follow a cure profile and decreased with 
increases in temperature curing.

Any volunteer?
CheersVicente Alvero                                      

Florin Mingireanu
Romanian Space Agency
Str. Mendeleev 21-25, et. 5, sector 1, 010362 Bucuresti, ROMANIA
office tel. +40-21-316.87.22; +40-21-316.87.23; 

cell: +40-757-768971 (primary phone)
fax +40-21-312.88.04



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