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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.
@Gordon
As @allObjects says, the servo motors don't ever communicate their position back to Espruino - the Espruino board just has to tell them where to go.
Unfortunately it means that the first time you tell them where to move, they just go there as quickly as they can. After that, Espruino knows where it last told them to go, so it can make sure they move very slowly.