Ever wondered how it is that elevator doors these days have the kindly habit of not crushing people... well its all about laser tripwires. We build a laser tripwire by using an LDR which is connected to an Arduino analog pin through a voltage divider. Thus the reading on the analog pin varies wit...By: Robotix_au
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from Instructables: exploring - technology - robots http://ift.tt/13CfyjK
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