Vicente, PID stands for proportional-integrative-derivative and represents a control loop feedback mechanism. Arduino is a microcontroller on which the PID can be implemented to maintain a variable to a setpoint. Florin On Sun, Jun 29, 2014 at 1:16 AM, Vicente Alvero Zambrano < vicente_alvero_14@xxxxxxxxxxx> wrote: > Certainly it is a good option. > Now we have to choose which is the best. If arduino or PID. > Please ask all people collaboration available to design this oven. > > ------------------------------ > Date: Sat, 28 Jun 2014 14:40:38 -0700 > > Subject: [SS2S-Main] Re: temperature controller with arduino > From: rawliquid@xxxxxxxxx > To: sugarshot@xxxxxxxxxxxxx > > > I noticed the other day that there is actually already a pid library for > arduino, as well as an autotuning library....not sure if anyone has started > programming yet > On Jun 28, 2014 9:37 AM, "Vicente Alvero Zambrano" < > vicente_alvero_14@xxxxxxxxxxx> wrote: > > Hi Tim, > Any news? > > ------------------------------ > From: vicente_alvero_14@xxxxxxxxxxx > To: sugarshot@xxxxxxxxxxxxx > Subject: [SS2S-Main] Re: temperature controller with arduino > Date: Wed, 25 Jun 2014 11:06:02 +0200 > > Sorry for the delay Tim, I've been busy these days. I'll try to answer > your questions. > > 1) What is the weight of the heaviest item you envision heating? > > In principle, the heaviest element we want to cure is the nosecone. I do > not know exactly the weight of this piece because it is not yet defined. > Say, as long long, 3 kg. > > > 2) What is the specific heat of the materials used? > > > I do not know the specific heat of fiberglass fiber, but maybe we can make > an approximation here: > > http://www.matweb.com/search/DataSheet.aspx?MatGUID=462fd1da8ad245b2ad40093889016448 > > > 3) What is the maximum temperature required? > > > With the current resin we are using, the maximum curing temperature is 80 > ° C. > > But we have used resins with a maximum curing temperature of 200 ° C. > > > 4) What is the maximum rate of temperature rise per min or per hour? > > > Approximately, the temperature rise is usually 10 ° C / h > > > 5) Will you be doing this work in Europe? I need to know what type of > power source you have available. Voltage and Amperage on the circuit you > plan to use. > > > In Spain, the voltage is 220V with a frequency of 50Hz > ------------------------------ > From: tyoung489@xxxxxxxxx > Date: Mon, 23 Jun 2014 00:26:26 -0700 > Subject: [SS2S-Main] Re: temperature controller with arduino > To: sugarshot@xxxxxxxxxxxxx > > Vicente, > > To attempt to answer your questions I need some information. > > 1) What is the weight of the heaviest item you envision heating? > > 2) What is the specific heat of the materials used? > 3) What is the maximum temperature required? > 4) What is the maximum rate of temperature rise per min or per hour? > 5) Will you be doing this work in Europe? I need to know what type of > power source you have available. Voltage and Amperage on the circuit you > plan to use. > > You gave 100 C as the max temperature required. I could not find any epoxy > systems that recommend such a low curing temperature. > I see 120-C to 180-C for Epoxy, 150-C to 180-C for Phenolics, and up to > 290-C for Polyimides > > For Epoxy I see 1-C / Min to 5-C / Min rise. > > This is 60-C to 300-C per hour. This is very different from the example > you gave. > > 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. > > > On Sun, Jun 22, 2014 at 2:47 AM, Vicente Alvero Zambrano < > vicente_alvero_14@xxxxxxxxxxx> wrote: > > 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 > > > Hi, > > 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. > > It 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. > http://www.embeddedcontrolconcepts.com > *Graphi**cs Screenshots* > http://www.embeddedcontrolconcepts.com/screenshots.html > > 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 > Brewery) > > https://www.brewershardware.com/BCS-460-Brewery-Control-System.html > *iPhone Interface Demo* > http://www.youtube.com/watch?v=4r9hCVYSt2Y > *Software Documentation* > http://wiki.embeddedcc.com/index.php/Main_Page > > *Other Electronics* *starting around $15* (some of these have the ability > to output to your computer some come with software) > > http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1311.R1.TR8.TRC1.A0.H1.Xpid+temp&_nkw=pid+temperature+controller&_sacat=0&_from=R40 > > > > > On Sat, Jun 21, 2014 at 4:02 AM, Vicente Alvero Zambrano < > vicente_alvero_14@xxxxxxxxxxx> wrote: > > Hi, > > 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 resistence. > > The objective of using arduino, is the possibility of developing a > graphical interface in which to determine the temperature ranges > ------------------------------ > Subject: [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 & procedures. > > 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? > > Cheers > Vicente 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 > florin.mingireanu@xxxxxxx > http://www.rosa.ro > > > > -- 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 florin.mingireanu@xxxxxxx http://www.rosa.ro