 | How To Build An Electric Eye |
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To build an electrical eye you'll need a piece of mica, a number 18 wire, and patience. Small holes will then need to be drilled in the corner of the mica. Instructions http://monsterguide.net/how-to-build-an-...
Then again, this answer might help you...
An electric eye is nothing more than the average photo cell found at any electronics parts store, such as Radio Shack. The cell operates by detecting changes in light as something passes through its view.