

Some mechanidms will not need individual motors, some might not need direct drive etc The design will also help selft the type of motor and it's specifications. The design will also help you decide how many motors you want for the joints that you want movable. That would specify weight, so you can select motors in the next stage (size voltage weight etc) The overall size of the robot and the materials used to build it. Once you have a design sorted selected, you would have a broad idea of a few things such as: You can get it printed or make it out of perspex/aluminium etc. You will be able to find some 3D printable models on thingiverse for eg. Since robotics is a multi-faceted field, the first step you would need is the have a mechanical design for the sentry.


A well planned robot is the best and easiest way to start, instead of just jumping at the items generally used! You have listed a lot of things that you might or might not need.
PORTAL 2 SENTRY TURRET USB DESK DEFENDER HOW TO
I have a budget of 50$ for the parts, let me know where I can buy them, in addition perhaps links to guides/tutorials on how to implement most of this.
