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Firstly i apoligize if this subject has allready been covered, i am new to this forum. I look after disabled kids as a volunteer so i put together a scalextric track together from 3 kits built all the buildings ect so now i would like to build a lap and timing system. I have tried webcam but is to unreliable because the kids keep activating the webcam by fingers or knocking the table. I have a game pad and a arduino uno board so i would like to know step by step details on what i need and how to put either one together. I am not sure what sensors to use but something that will not activate by knocking or shadows. Any help would be usefull