This is an over engineered peephole and lock that I built for my room. An iris mechanism opens and closes to reveal or hide a peephole. It uses an RFID detector to identify users requesting entry, and locks/unlocks the door with a servo that's hooked up to a deadbolt. It uses a text to speech module to talk, and, the peephole itself doubles as a HAL-style appearance from the outside when an LED lights up in front of the eye-piece. It is connected to the home WiFi network and is controlled via voice commands to Alexa.

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The iris was built with a plywood frame and copper leaves cut from a sheet.  I used bicycle chain rivets super-glued into the copper leaves to assemble the iris.  The 'Pi' frame was built using Lowe's paint sticks painted silver.  Most of the wood used was "found" wood lying around. My dad helped me drill the hole in the door.

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The gears are all 3D printed with my custom designs.