When temperatures plummet, there’s nothing like a hot beverage to keep you warmed up inside. [] aka [Tim] sure does fancy a nice cuppa, but only within a certain temperature range is it ideal to drink. In an attempt to signal when the time is just right, he created various iterations of a hot beverage coaster.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/03/08/beverage-coaster-indicates-ideal-drinking-temperature/