ELEKTOR FORUMS

Hi.

I have been messing around with a reflow oven myself and have been looking at the design you did back in 2006. Really great that you hvae the source code as a free download. It has enabled me to learn a lot and having kept the magazine article I have found it really useful.

I looked through the code and read the article and well I was wondering if there was any more you can add about the algorithm. I understand it was quite some time ago. I would just like to know more about how you came up with it.

From the souce this seems to be the delta calculation.

deltaT = ((3*deltaT)+(((int) read_temperature())-tmp)*25))/4;

Could you throw any light on where the 3*deltaT comes from. Is that a weighting factor that you found through practical experiments? And also the *25?

Thanks.

Trev