Hi, My entry to the 1998 Circuit Cellar contest was exactly this. I used a De Longi toaster oven as it is fan-forced. This is important to help keep an even temperature in the oven. It used a Platinum resistive temp sensor and a PIC16F84, along with a 2x8LCD, rotary encoder, 2 push buttons, 2 relays, piezo buzzer and an rs232 interface. Quite a lot of I/O for an 18 pin micro. The software was written in CCS C and I ended up with about 6 words of memory left after a couple of code optimising rewrites. It got a mention in the magazine but did not win :-( Basically it worked like this. 1. The board was put in the oven 2. The Start/Stop button was pressed. (The heater and fan turned on. The LCD displays the current temperature) 3. When the temp reaches the "Hi" set point (218 degs C) the Heater turns off and the fan stays on to help cool the oven. (also the oven door is opened at this point. 4. When the temp reaches the "Lo" set point (50 Degs C), the fan turns off. 5. Take the board out and start again. The relays were to control the heating element and the fan. The rotary encoder was for entering the Hi and Lo set points. If a "D" character is sent over the RS232 I/F, the oven will reply with the current temp. Eventually I plan to replace the 84 with a 628 with twice the code space. That way I can add to the RS232 command and have it controlled by a computer or another PIC. The idea is to control the oven to get a proper SMT temp profile. I hope this helps, Peter Homann mailto:Peter.Homann@adacel.com Adacel Technologies Limited, 250 Bay St, BRIGHTON, 3186, AUSTRALIA http://www.adacel.com Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960 Mobile 0421-601 665 -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of David Harris Sent: Saturday, 16 November 2002 12:40 PM To: PICLIST@MITVMA.MIT.EDU Subject: Re: [EE] Hot air soldering = cheap was Re: [EE]: Printer to PCB? I suggest you back through the PICLIST archives, I think there was lots of discussion. Also, you might be interested in the "toaster oven for SMT" stuff --- look at: E-Z_Bake@yahoogroups.com Its really quiet, but people were baking boards successfully -- I think we are still waiting for the definitive project with a PIC based temperature profiler/controller. David Josh Koffman wrote: > Ah...thank you for the link! I never would have known about the steel > wool. At least I know I wasn't the only one who thought it worthy enough > to try. Anyone actually succeed with this design? Any suggestions about > solder paste? Keep them simple as I've never used it before :) > > Josh > -- > A common mistake that people make when trying to design something > completely foolproof is to underestimate the ingenuity of complete > fools. > -Douglas Adams > > David Harris wrote: > > The originator did descibe putting some steel wool into the nozzle to help > > the air heating. This is described at the parent page: > > http://www.usbmicro.com/apps.html which is html and includes the pictures. > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. -- David Harris OmniPort Home Page: http://www3.telus.net/OmniPort1/ Discussion egroup: http://groups.yahoo.com/group/OmniPort Swiki: http://omniport.swiki.net/1 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu