Hi there. I am trying to put together a simple temperature controlled water bath for sous vide cooking. it consists of a pot sitting on an electric hob with a temperature sensor sitting in the bath.the arduino is connected to a solid state relay which allows it to control the hob. i have been trying to use the arduino pid library to regulate the temperature but havent had a great deal of success. i tried using the pid adaptive tunings example and watched as it still applied power as it passed the setpoint which had me bemused. could anyone point me towards a resource which would provide explanation on how to choose the best pid values? my setup has a big metal plate holds a lot of heat and so takes a long time to dissipate resulting in hefty overshooting and lengthy correction time. its far from an ideal setup but im sure with the right tuning it can provide a reasonably steady state.
i have also tried to use the autotune library but again havent quite been able to grasp how to use it. i have tried looking for good documentation but havent found anything which explains how to use it(ive seen the authors description on how it works but this doesnt explain how to implement it)
any help on the matter would be much appreciated. thanks.