Kreutz
How does your kit compare to this:
http://www.sparkfun.com/commerce/pro...products_id=81
1) Obviously yours needs to be assembled by the purchaser.
2) LCD is not included but is plug and play by end user if desired?
3) How does it control the heater? Relay? Triac?
4) Are you planning a standard serial connection? If so, might I recommend an FTDI FT232R. I have a UB232R whic uses that chip and let me tell you, it is much, much nicer to have USB, especially with the lack of serial ports nowadays.
5) Would you include some basic PC software for specifying ramp and soak times to send to the controller and to record the actual temperature profile?
6) How much will the tuning vary from oven to oven? How difficult would it be to include some tuning software to optimize the profile on "dummy" board before actual use.
I think you could have a barebones kit (as specified in your original post) plus one or more addons which would enhance the quality and ease of use of the oven. Keeping things simple (plug and play) would be best.
http://www.articulationllc.com/main.sc
Something between the sparkfun board and the below link would be ideal in my opinion. There is quite an open price range for this type of kit as well.
Regards
Matt