Boxer Pro Sentry Gun
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As you can probably tell by my projects I'm a huge Aliens fan. My new other, other, other project is making a basic sentry gun from the movie. I thought a Boxer would be just an ok base to start with while learning arduino, but it sounds pretty good and the use of belts makes it a good match for my needs. Going to use a stepper motor with limit switches for movement. When the PIR sensor is tripped it will stop movement, rev the flywheels, then fire. Im not sure how well the PIR will do on a moving platform, and it will have to be housed in a way that cuts out the perifial sensing so that it only stops and fires at objects directly in front. Maybe down the line I'll upgrade it to be more of an active sensor, but for now it should do the trick.