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How to make IR on/off Switch for a simple Led Answered

hi every1 i just want to that , how can i Cheaply able to make Infrared LED swich to control other LED's

i just want to make this experiment :

a door where when someone pass from it , lights an led (using IR led)

PLEASE HELP ME !!!

Thank you in advance

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try this http://www.youtube.com/watch?v=gQk3xjOUo4Q