Idea: Add rose(), fell() and possible other state-changing methods to analog sources OR create a specific ChangeDetector unit to do so for all nodes

[sofian]

These would need an extra argument which could be some kind of tolerance.
Problem with this could be that is would represent an extra cost in memory to keep the previous value.

Different things to consider:

• roseAbove(threshold)
• fellBelow(threshold)
• roseBy(variationPerSecond)
• fellBy(variationPerSecond)
• crossed(threshold)
• changedBy(variationPerSecond)

[sofian]

An alternative would be to create a specific Node for the job that would generalize the concept. It could potentially be able to handle both digital and analog nodes. Something like ChangeDetector or something.