With photocells in both goals and a bright LED-display on the table, a USB powerbank provides action for at least 30 hours.
Project showcase by OSZ Täuffelen
Hey, cool idea! However I am afraid I cannot help much as I am not too much of an Arduino expert and the project is long finished. Let me still give these suggestions:
Otherwise, ask here: https://forum.arduino.cc/
Good luck and please give notice once you got it working!
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