I’ve been having trouble with my composites oven. I think it lies in two areas:
- it’s a little leaky – can be fixed with a bit of expanding foam and a more careful cut of the kingspan i’ve used to make it. I could build a wooden frame for it as well, but that seems a lot of faff
- The sestos PID controller I have is a bit hard to use – it’s well understood the chinglish instructions are abominable.
So, how to fettle this myself?
I’m actually thinking of making my own and the plan is:
- keep the triad switch for the oven, fan, etc.
- write a C++ application to do the PID control from a PC
- configure multiple ramping profiles that are saved and can be selected at will
- the application can have multiple learning points, so the PID can be most efficient at each ramping step
- use a pair of xbees to provide wireless sensing and control of the oven
- have 3 temperature sensors – two in the oven and one for ambient temperature
- have a set of fans in the oven as well as the initial fan so that hot-spots can be eliminated
- logging so you can see what the temp was doing
Saying that, there’s also this quite sophisticated controller which does most of the above and has a serial interface and instructions in English. So, I could write the application to control the PID and just use it for logging – but I wouldn’t get the wireless control of the oven (mine is in the shed).