ROBOTICS

I am currently working on a wireless robot and I want to replace my relays with a motor driver. I am using L293D which is a H bridge bi- directional driver. I have a 4 channel ASK remote control set. I need some kind of way to generate logic to provide the neccessary truth table to get the following conditions...

Forward
Reverse
Left
Right

Somebody pl help me out

Hello!

You should tell us what will command the L293. A uC? Cabled logique? Other?