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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@FransM
I fear the amount of available memory will become the limiting factor.
drawImages might be useful, but I am worried about the complexity.
as @allObjects pointed out you may want to rewrite multiple hands (at least the minute and hour one).
Also with a minute hand I might need 60 different images (unless there is rotational symmetry in the background in which case multiple hand backgrounds could use the same image to restore.