How would you get a motion sensor to move with you?

I'm doing an invention for a science project and I need a motion sensor that could be rigged to move with you.How would you get a motion sensor to move with you?You would need a stepper motor and a controller.

You would need to write a program to lock on to the motion.



There are some commercial units out there. Many are used for cameras.How would you get a motion sensor to move with you?you can use the principle of closed loop systems by making two sensors that detect motions and sum their output int an OP amplifier and feed the signal into a dc motor

let D1 and D2 so the normal output is 0 when D1 operate The OP will give a + signal so the motor will turn clockwise.

if D2 operate The OP will give a - signal so the motor will turn anti - clockwise

this is a very basic idea and i hope it will inspire you for a more complected system