Adam Turner Network Security & Electronics Program, Dept. of Applied Engineering & Technology, Eastern Kentucky University

OUTLINE  Sometimes persons may enter rooms in my home and mess with my stuff without permission. My home does not have many doors downstairs where most of my cool stuff lives. A sentry turret that fires plastic 6mm airsoft pellets should hopefully keep people away from my stuff. A turret will be constructed and installed in one of my rooms without a door. The turret should not cause real physical harm to persons or animals, only keep them away from my stuff. 2

MOTIVATION  My closet has no doors  My two animals can eat or destroy anything  A sentry presence should keep them away 3

INTRODUCTION  Autonomous Sentry Project has been around for many years  Open source code is available for the tracking software.  Many people have been successful using this code. 4

PROBLEM STATEMENT 5

Assumptions  Builder has access to an arduino  Builder understands basic mechanical engineering  Builder understands basic electronic engineering  Builder can read and edit java  Builder wants a sentry 6

PROPOSED SOLUTION  Attempted a direct drive sentry  Parts were too heavy for servos to support them  Had to create support for servos  Had to design a system that could withstand lots of torque and inertia from moving parts 7

Initial Platform 8

Many parts were salvaged/free 9

I needed a sentry, to protect my sentry build 10

Block Design 11

Wiring Schematic 12

RESULTS  Main issues were with the software  Was intended for older operating systems  Had to download many C libraries not included with windows 7  Had to find Arduino libraries called in the code and put them in the correct folders for processing 13

Source: Sentry Gun

CONCLUSIONS  Appears to work, however, will track any motion or perceived change  Software at mercy of the webcam  Vibrations in the camera make the software perceive motion 15

FUTURE WORK  Stop the vibration with even more rubber washers  Make a mount that attaches to picatinny rails and adjusts for center of gravity  Contact: 16

REFERENCES  Make Your Own - Project Sentry Gun. (n.d.). Retrieved April 13, 2015, from  Real-Life Sentry Guns for Sale - Targeting System Software History. (n.d.). Retrieved February 15, 2015, from  SENTRY GUN - New Airsoft gun by Redwolf Airsoft [English]. (n.d.). Retrieved February 23, 2015, from  Autonomous Paintball Sentry Gun. (n.d.). Retrieved February 23, 2015, from  Sentrifying a Nerf gun. (n.d.). Retrieved March 2, 2015, from  SentryGun53/Project-Sentry-Gun. (n.d.). Retrieved March 2, 2015, from  Download Processing. Processing is available for Linux, Mac OS X, and Windows. Select your choice to download the software below. (n.d.). Retrieved April 13, 2015, from  Arduino - Learn the basics. (n.d.). Retrieved April 13, 2015, from 17

ACKNOWLEDGEMENTS  Project Sentry at Rudolph Labs  Link to project video: