Dagu Rover 5 chassis robot demo

Er, maybe I was wrong. My mind is still seething over the lengthy delays trying to ban spammers on the forum. :wink:

This code here:

  // check current drain
  while (millis () - start < time_to_go)
    {
    if (analogRead (0) > 325)  // > 1.46 amps
      break;    
    }

That makes it stop if the current drain exceeds 1.46 amps. You might want to tweak that a bit. Perhaps your motors are drawing more than mine did. So if you make it higher, it will draw more current before stopping.

I am assuming that is the delay between direction changes?

Yes.