Help for automatic movement instructions

Hello and good day, today I ask for your help to know how to program the automatic movements of my character. I want it to move automatically and when it collides with an object, it moves in the opposite direction. How I can get this?

thanks for your help. I have already tried it in several ways, but I can not do it.

Do you use Platform behavior?

You can add an instance variable "Direction". At first set Direction="right"

On collision, mirror the sprite and change Direction to "left"

On every tick:

If Direction="right" , simulate Platform pressing Right

If Direction="left" , simulate Platform pressing Left