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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.
@Manxome
Instead of cutting that sensor in half, try using it like a laser beam sensor...attach a small mirror to the other side of the goal, aim the sensor at the mirror and then detect when the ball breaks the beam. Might work.
eh...I just looked at the datasheet. Distance to reflector needs to be about 14mm or less. If you cut it in half, you'd get about 28mm, just over an inch, probably not enough...
Unless... the ball is shiny enough to reflect back to the sensor. You could put a sensor on each side of the goal. I don't think you can know what works until you try it.