The Sentry Project

This is how the electronics work:

There are two servos.

One to control the turret's left and right movement (X Axis) and one for the Y axis (up and down). Those 2 servos (and a 'battle switch') plug into a servo controller which is already included in the software kit.

That servo controller has a RS232 (Serial) port which is old and not found on newer computers so a RS-232 to USB converter needs to be used like this one:

if you want the pc to be more than 5ft away you will need to use an RS232 extender

A 'Battle Switch' is used to turn the electronic water valve on and off.

The USB end of the serial to USB converter plugs into the PC or Laptop and shows up as a com port.

If you don't have a laptop the Windows version of the Acer Aspire One ($250) is what I use.

If you want to use an analog/CCTV/bullet/IR camera then you would need to use an analog to digital video converter. This is one of the only ones I could get to work right. http://www.amazon.com/EASYCAP-Audio-Video-Capture-Adapter/dp/B0019SSSMY

Tools Needed:

 

• A drill
• A Phillips head screwdriver
• A flat head screwdriver
• a set of drill bits
• pliers
• something to cut wood with (a table saw would be best)
• hole cutter bit made for cutting holes for door handles.
• hot glue gun

Materials and parts Used:

• a piece of plywood
• screws
• zip ties

• 100’ CAT5 cable $20 eBay

• 100’ video + power camera cable $15 google products search

• 100’ water hose $25 google products search

• 100’ extension cord $20 google products search

• 6v 3amp power supply for servos $25 http://www.powerstream.com/ac-0630.htm

• servo controller from the software kit

• electronic water valve $15 Lowes/Home Depot

• ball valve $10 lowes/home depot

• nozzle $5 lowes/home depot

• copper ¼ od tube $10 lowes/home depot

• X servo $10 hobby shop s3003 or HS-311

• Y servo $10 hobby shop s3003 or HS-311

• Battle Switch for the trigger. (click on the picture of it above)

• 3’ ¼” id hose $10 lowes/home depot

• RS232 extender $60 http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10105&cs_id=1010503&p_id=3598&seq=1&format=2

• 12x12x6 electrical box $35 Lowes/ Home Depot

• IR camera (IRB420) $90 http://www.discount-security-cameras.net/infrared420linecoloroutdoorbulletcamera.aspx

the trigger servo completes the circuit which activates the electronic water valve. I burned up 2 or 3 servos on previous servo switch designs. this design allow the servo its full travel so that it cannot bind against something and burn up if it is set incorrectly.