username 198 Posted December 20, 2011 Share Posted December 20, 2011 Hey all,Nate here, made a nice little reflow oven to help me in the construction of surface mount boards. Got a video explaining it all here:PCBs and Control Boards for sale here: viewtopic.php?f=22&t=2040 No longer for sale, no time to pump any out. Project Video: Project Pics:Schematic:This is my old V1 schematic. Todo if you want a better board: -Use a MSP430G2553 MCU (more pins and flash) -Use a non EOL thermocouple driver IC: MAX31855KASA+ -Add in a FT230XS for a USB interface -Add flyback protection to relay LSD if a mechanical relay is used. Full size at link:http://forum.43oh.com/uploads/monthly_12_2011/post-4818-135135531417.jpg Oven: Convection (30 usd)http://www.walmart.com/ip/Black-Decker-Toaster-Oven-Stainless-Steel/16913546 Oven: IR (recommended that you use an IR oven of sorts) http://www.walmart.com/ip/George-Foreman-Infrared-Countertop-Oven-with-Rotisserie/19411514 C# GUI for live plotting: Here is the BOM:Update: Schematic has most Part #s on it Thermal-couple: (Important that it is low thermal mass and rated for temp range) Digikey: 290-1911-ND Thermal-couple IC: MAX31855KASA+ MAX31855KASA+T Relay: (this is a mechanical relay. I salvaged a SSR for my V2. I highly recommend you use an SSR for long life and quicker switching times) Digikey: T9AS1D22-5-ND (Relay) Misc Digikey Part # (Part Discription)MC78M05CDTGOS-ND (5V regulator Dpak)445-1590-1-ND ( CAP CER 1.0UF 25V Y5V 0805)754-1133-1-ND ( LED 2X1.2MM 630NM RD WTR CLR SMD)754-1127-1-ND (LED 2X1.2MM 570NM GN WTR CLR SMD)CP-102B-ND (CONN POWER JACK 2.5MM PCB CIRC)785-1112-1-ND (MOSFET N-CH 20V 25A TO-252 (Relay))IRLML6344TRPBFCT-ND ( MOSFET N-CH 30V 5A SOT23 (SSR Load))RMCF0805JT100KCT-ND ( RES 100K OHM 1/8W 5% 0805 SMD)RMCF0805JT47K0CT-ND ( RES 47K OHM 1/8W 5% 0805 SMD)RMCF0805FT499RCT-ND ( RES 499 OHM 1/8W 1% 0805 SMD)296-8247-5-ND (IC 8-BIT SHIFT REGISTER 14-SOIC)296-28430-1-ND (IC MCU 16BIT 20TSSOP)RMCF0805JT1K00CT-ND ( RES 1K OHM 1/8W 5% 0805 SMD)CT94EY104-ND (TRIMMER 100K OHM 0.5W TH)MCP1700T3302ETTCT-ND ( IC REG LDO 3.3V 250MA SOT23-3)+ a 16x2 LCD display+ some dip headers that are used for jumping and programing.+ 5mm/.2in lead spacing terminal headers for relay and thermocouple input. Rickta59, RobG, larsie and 12 others 15 Quote Link to post Share on other sites
zeke 693 Posted December 20, 2011 Share Posted December 20, 2011 IMHO, this is a potential POTM winner. It's Toggle I'm glad you talked about oven profiles. :thumbup: BTW, they're not incredibly painful to solder. They're just annoying when you have 8700 parts (or more) to solder! Nice project. Good explanation. Good video. Good Job! :clap: I am very interested in building one of these for myself. Will you be making your project files available? Quote Link to post Share on other sites
bluehash 1,581 Posted December 20, 2011 Share Posted December 20, 2011 Agree with zeke. Pretty good stuff. If you have a bigger LCD, you could display the profile in real time Thanks for sharing, please submit it to the POTM! Quote Link to post Share on other sites
RobG 1,892 Posted December 20, 2011 Share Posted December 20, 2011 Can it be used to take LaunchPads apart Quote Link to post Share on other sites
poofay 3 Posted December 20, 2011 Share Posted December 20, 2011 That's awesome! I love reading about Toaster Oven Reflow projects. At my last internship I was surprised to find that a reflow oven was just an industrial/beefed up pizza oven of sorts. It's pretty cool that we can have that technology, though a bit cruder, in our homes. I'd like to point out that you can reflow boards with components on both sides due to the surface tension of the molten solder. If you leave enough space on two sides of the board, you can sit the board on a couple rectangular blocks of aluminum, suspending the board and components above the metal grate. You'd be surprised at how strong the surface tension is. I thought your video was great too! Did you use a stencil to get the paste onto your board? username 1 Quote Link to post Share on other sites
timotet 44 Posted December 20, 2011 Share Posted December 20, 2011 This is awesome , great job. I have a toaster oven in the basement that is waiting for this. Do you have boards for sale? +1 for what zeke said about this being a worthy POTM entry! good work Tim Quote Link to post Share on other sites
RobG 1,892 Posted December 20, 2011 Share Posted December 20, 2011 Tip: load the video and scrub between 3:40-4:25 Quote Link to post Share on other sites
username 198 Posted December 21, 2011 Author Share Posted December 21, 2011 Wow, quite the response. Thanks all for the comments/feedback! I'd like to point out that you can reflow boards with components on both sides due to the surface tension of the molten solder. If you leave enough space on two sides of the board, you can sit the board on a couple rectangular blocks of aluminum, suspending the board and components above the metal grate. You'd be surprised at how strong the surface tension is. Many thanks! I assumed this might be the case but I haven't had a chance to test it yet. Well... I still got about 3 projects pending so i'll have to take that into consideration when designing the PCBs :mrgreen: . I have a toaster oven in the basement that is waiting for this.Do you have boards for sale? Sure, I did it with PCB express and so I got 10 boards... Were you interested in the PCB only or a fully assembled unit? Now one thing to take into note is that this project is slightly pricey. Anything using a thermocouple is expensive if done properly. The max6675 is a flippen 15ish usd on digikey(cold compensator for the thermocouple). Then a k type thermocouple thats rated for more than 400C while having a small thermal mass is also pricey(quick response times). Digieky has one for 15 usd. So right there its 30 usd just for the cold compensator and the thermocouple. If your still interested PM me and I can try to get you some type of quote. I am very interested in building one of these for myself. Will you be making your project files available? Done zeke 1 Quote Link to post Share on other sites
cde 334 Posted December 21, 2011 Share Posted December 21, 2011 Maxim-Dallas has a somewhat gracious sampling service. Quote Link to post Share on other sites
zeke 693 Posted December 21, 2011 Share Posted December 21, 2011 I'm giving you two thumbs up Nate because this is the kind of tool that makes our lives easier as Makers. I'm putting this on my todo list asap. What MOSFETs did you choose to control the AC? Have you considered using a Solid State Relay? Have you considered using a PID algorithm to control the temperature? Did you come across this article during your research? Quote Link to post Share on other sites
SugarAddict 227 Posted December 21, 2011 Share Posted December 21, 2011 Want... even though I hand solder 0402's with ease... How much does the complete project cost, including oven? Quote Link to post Share on other sites
username 198 Posted December 22, 2011 Author Share Posted December 22, 2011 I'm giving you two thumbs up Nate because this is the kind of tool that makes our lives easier as Makers. I'm putting this on my todo list asap. What MOSFETs did you choose to control the AC? Do you mean relay? Relay I used was 33ohms. 5/33 =~152mA. Any nchannel mosfet rated for atleast an amp of current is fine. Have you considered using a Solid State Relay? I did consider. However, those are expensive. A simple contact relay is all you really need. Have you considered using a PID algorithm to control the temperature? Well, ultimately your control over the temperature is somewhat limited due to the response time of the heating elements in comparison to the shortness of the profile. So there really wasn't any need to run some fancy algorithm cause it wouldn't have produced much different results. In addition, you don't want to PWM the relay to much because that would damage the relay contacts switching in/out 1.2KW at a rapid pace. My ultimate goal is to implement a reflow profile without having to hurt my brain nor wallet to much. I simply have a target temp which is the actual reflow profile and then I turn the oven on/off based upon comparing actual temp versus targeted temp. Acourse, the heating elements still radiates after they are turned off so you have to compensate that. Even with the compensation, its still not perfect and you only got 2kb for everything. With that said, it still is pretty darn close to a commercial profile and I can try to get you guys a live plot of it at some point. However, I diverged from the commercial re-flow profile abit in order to guarantee safety of my components. Most commercial reflow ovens go up to about 220C in a PB profile. This is to ensure that all components regardless of there size get flowed. If you know the max component size on your board is a Dpak there is no need to go to that high of a temperature. So in actuality, my oven stresses components less then a normal reflow oven. Did you come across this article during your research? Not really... i'm kinda a fan of re inventing the wheel so I didn't use many references. A knew a guy on a random form that built one and he suggested I use a particular relay. That was the extent of my references. even though I hand solder 0402's with ease... .... thats just not fair... How much does the complete project cost, including oven? 30usd currently for oven ( if you want to top my project you could always get a convection oven... that may improve it alittle) 15 usd for the thermocouple (digikey only really sells one and its a darn good one. Don't get a cheapie off ebay. I learned that the hard way) 15 dollars for cold compensator (max6675, there is a new version called the max31855 but the k type version is out on digikey. Mouser is the way to go. We should do a group order for 25 of them. http://www.mouser.com/ProductDetail/Max ... 9xg9sJQ%3d 13usd for your own pcb board (provided you go with pcb fusion and you don't mess up. I got 10 of them so I can sell some) 2.7 usd for LCD screen: http://www.ebay.com/itm/HD44780-1602-LC ... 3f0b311fa6 3.65 usd relay = T9AS1D22-5 *Note, this works at 3V, mine as well to save power. coil impedance = 33 ohms. annddd... those are the big spenders.. i'm sure you guys can figure out the rest on your own Total cost can be under 100usd if your smart about it. I was developing so mine was more. However, the price is far worth it and far better then anything you will find on ebay..ect. As far as i'm concerned it was worth it for me cause i'm just a student and the 100+ usd I spent on this project taught me waaaay waaaay waaaay more than the stupid 14k + a year I pay for dumb college tuition..EE colleges are generally a pathetic joke and the only reason I would even consider it is because society wants me to have a stupid degree. This project was fun and worth while investment. Will help me with my senior design project also =) Quote Link to post Share on other sites
ohmselectronics 6 Posted December 22, 2011 Share Posted December 22, 2011 Nice Job!, you can get the stencils on Pololu http://www.pololu.com/catalog/product/446 or individual stainless at proto advantage http://www.proto-advantage.com/store/pr ... id=2220130 (nope i do not work for them, if you're wondering ) cheers Quote Link to post Share on other sites
bluehash 1,581 Posted December 23, 2011 Share Posted December 23, 2011 Hi Username, You will be able to submit only one project to the POTM contest according to the rules. You also have the laser security system v2 submitted. You will have to choose one of them to enter the contest. It may have slipped your mind. Just letting you know. Between the two, I would choose the reflow oven. :thumbup: Quote Link to post Share on other sites
username 198 Posted December 23, 2011 Author Share Posted December 23, 2011 Nice Job!, you can get the stencilson Pololu http://www.pololu.com/catalog/product/446 or individual stainless at proto advantage http://www.proto-advantage.com/store/pr ... id=2220130 (nope i do not work for them, if you're wondering ) cheers proto advantage is nice. I got my tssop-14 stencil from them. Only thing is there slightly overpriced but they certainly do the job! Hi Username,You will be able to submit only one project to the POTM contest according to the rules. You also have the laser security system v2 submitted. You will have to choose one of them to enter the contest. It may have slipped your mind. Just letting you know. Between the two, I would choose the reflow oven. :thumbup: My apologies, I modified my original POTM post to the reflow oven and thanks for the suggestion! Quote Link to post Share on other sites
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