Automatic Beam Blocker

A **beam blocker** (BB), also known as "beam shutter", is a device used to block / unblock a light beam while the source power stays on.

Here I present a way to implement an extremely cheap and simple Automatic Beam Blocker (ABB) that can be used to block a low power laser beam.

The beam blocker is composed of a shutter that is open or closed by pressing a push button connected to an Arduino Uno board.

Materials
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* 3D printed beam blocker (STL files available on Thingiverse repository)
* Servo motor (Tower Pro SG90 9G Mini servo)
* Push-button
* 1 Kohm resistor
* Connection cables
* Arduino UNO board

Implementation
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To build the beam blocker, first, download and print the files **automatic_beam_blocker_1of2.STL** and **automatic_beam_blocker_2of2.STL**. Afterwards, mount the pieces according to the figure.

In principle the Automatic Beam Blocker requires only a 1/2" optical post to be mounted on any experiment. Notice, howeve