Ultimaker/Ultimaker2Marlin — pull request #53 by TinkerGnome (2014-12-24 16:25:05+00:00)
Title: reduce jitter during display of temperatures - use a moving average

2nd try...
The jittering temperature numbers on the UM2 display are a bit annoying. This change uses a moving average value instead to "smooth" the displayed temperatures, but leaves the primary values untouched.