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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
I'm afraid the TRCT5000 probably won't be great for that - as @allObjects says it's very much on/off.
Another option I've come across recently is actually to use a magnetometer. If you put a neodynium magnet on the plunger that pushes the nerf darts up (I guess there is one?) and position the magnetometer correctly then you should be able to measure the direction of the magnet - and so work out where the plunger is.
It'd need some experimentation, but the magnet itself should be so much stronger than the earth's magnetic field that the angle of the nerf gun won't really matter.