Trigger when value is unchanged for 15 minutes

[moddeydhoo]

Hi guys,

As the title suggests, I'm trying to create a trigger for a value that has remained unchanged for a period of time. Normal behavior for this value is to fluctuate up/down throughout the course of the day, thus 15 minutes of no change would be a cause for concern.

To no avail, I have searched for similar questions and bastardized my own expressions using the triggers documentation... queue the "I'm fairly new to..." line

Thank you in advance.

[tim.mooney]

My first thought was to use a calculated item based on something like max - min, but I actually don't think that's needed, since the trigger functions include a delta() function that appears to do exactly what you need. If the .delta(15m) == 0 (for integer item values) then your item hasn't changed in 15 minutes.

If your item is returning floating point values, you probably can't look for a delta of 0, since there might be very slight differences in the floats, so you would use .delta(15m) < some_small_float_number_here

[moddeydhoo]

Tim, Thank you very much, the delta function has worked a treat!