Hey yeah!  This helps -- can you publish the schematic and code -- is it for
public consumption?
David

Peter Homann wrote:

> 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 <http://www.adacel.com>
> Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
> Mobile 0421-601 665

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu