Rule for changing temp and resume rule after power loss

[rlkoshak (Rich Koshak)]

You could use this as a starting point:

Design Pattern: Cascading Timers

Please see Design Pattern: What is a Design Pattern and How Do I Use Them. This Design Pattern is a revisitation of a solution I wrote up here. Problem Statement There are many situations where one needs to cause a series of activities to take place in sequence with the option of being able to cancel the sequence of activities and be able to control how long each step takes to complete. One common use case is for controlling an irrigation system that consists of more than one zone. Concept …

The only part that would be an exercise left to the student is figuring out how much time is left in the current activity when OH comes back up. The code above will restart the activity but do it for the full amount of time, not just the amount of time that might be left. (e.g. if OH went down 20 minutes into your 30 minutes at 30c it would restart the timer on that activity for a total of 50 minutes).