Hi i'm new to autonomous bots and i'm looking to make a 6kg autonomous robot.
What do you want it to autonomously do? Is this for school or for fun? Do you want it to follow a line, avoid objects or act as a sumo bot. Anything is possible so we need to know what it is you want it to do before giving specific advice. Why do you specify 6kg? Is this for a contest of some type?
If you want to build both an autonomous bot and an RC one you can use the RC controlls to test your chassis and drive system and then very easily add the microcontroller and sensors to convert it to autonomous controll. Shutting down after 3 minutes should be very easy to implement with any microcontroller.
Conscripted