The Triwheeler

Hi everyone
I'm thinking to build a three wheeler robot, tow in the front and one in the rear for support.
It's very simple, sending a binary code from my pc through any communication meduim (RF - Bluetooth) and then recive it in the robot and decoded so it open sertain switchs to do a sertain task like move forward or backward.
No microcontroller cause it's so hard to find it in my conutry, any way I also like to put sensor -ultrasound- maybe.
Now can any body help me by telling me it's possible ??
if yes I also need help by an opinion,links, articals any thing that can help me
thanks.

You aren't going to be able to interface via RF, PC, or ultrasound without a microcontroller.

Thanks alot