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Parts List

Some general suppliers:

Hardware components and Webcam

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ItemHow it will be usedCommentsCost
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ItemHow it will be usedCommentsCost
Servo Motors (3) Aiming the gun and squeezing the trigger Standard type (180° or 90° of rotation) $9 ea. 
Wood / metal Material for building your gun's base Your base will be unique, so I don't know what you will need for materials. It is up to you. I use plywood and a little bit of sheet aluminum. $9 
Solderless Breadboard Making connections to servos This will make the wiring much easier and more organized. $5 
USB A to B cable To bring power and signals from the computer to the Arduino Carefully select a length that will work for you. How far away will the sentry gun be from the computer? $5 
Webcam To see and track targets No need for hi-res, but you can get it if you want. 320x240 pixels will work fine, 640x480 too. Any higher the resolution, the slower the code runs - and unless you are looking for targets really far away, it won't help much. $30 
Servo battery box Power for your servo motors For most servo's, 4 AA, AAA, C, or D batteries will do the job, wired in series. Get a nice box for them, preferably terminated in a standard 5.5mm DC barrel jack, center+. $3 
Arduino or Sentry Controller Interface with computer, control servo motors Arduino Uno, Duemilanove, or equivalent. The Standalone Sentry Controller replaces the Arduino and all wiring. $25 for Arduino, see product page for controller pricing 
Wire Connections to servo motors Thin, solid core wire is best for breadboard connections. $2 
Screws, nuts, bolts, other hardware Assembling your sentry gun's base Your base will be unique, so I don't know what specific hardware you will need to build it. This is up to you. $10 
Batteries servo power 4x AA's, or AAA's, or C's, or D's  
Gun / Dispencer of your choice you know... Mainly this is up to you, but go for lightweight if you have a choice  
Showing 11 items
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