Relay Switching - Turn on A then after time turn on B

[rossko57]

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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 …