Controller part 5 - state machine
Meanwhile...
Here is something else to contemplate: a state machine diagram for the operation of the controller.
Key - 
PWM - pulse width modulation (for the solid state relay that drives the heating element)
AF - autofill
OT - overtemperature 
 
 
 
          
      
 
  
 
 
 
 
 
 
 
 
 
 
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