Ta. That could work for removal, but I was also hoping to pause heartrate monitoring when removed as well as silencing. Perhaps a hybrid approach might work, with movement/orientation switching is back to "being worn" mode. All good food for thought...
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.
Checking heart rate could work?