Executing Code With a Switch

hey,

i'm new using arduino, , i'm in process of creating track, marble rolls down onto copper switch. when marble on switch, executes code turn on led. don't understand how execute code using switch. know quite vague, useful right now. thanks.

have written sketches yet? if not should start running of simple example sketches included in arduino ide. should study code examples see how functions work , steadily able write own simple sketches. arduino never designed plug , play solution peoples projects, rather simple effective platform 1 acquire knowledge , experience create own projects.

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