I agree with Peter. Trying to save a mere 180$ by developing a solution that already exists isn't good use of resources. > Op 30-jun.-2014 om 00:52 heeft Peter Johansson <rockets4kids@xxxxxxxxx> het > volgende geschreven: > > On Sun, Jun 29, 2014 at 6:36 PM, Vicente Alvero Zambrano > <vicente_alvero_14@xxxxxxxxxxx> wrote: > >> My idea is to use an old oven heater like the picture. >> With respect to the PID controller, maybe it is cheaper to do it manually, >> without writing code. > > One option to consider -- and an advantage to going with a homebrew > solution -- is to simply read a configuration file containing the > temperature profile and PID tunings over over the serial port. > > This way you get the maximal possible control with the minimal > hardware cost and minimal software development time. > > -p. >