I am trying to get the Vex robot to back up using the encoders until the three line followers I have mounted on the front of the robot finds the black line. So far I can run forward to follow the line so I know the line followers are working correctly. But when I try to go backwards it just sits there and skips the command.

I have tried an (if, else) move and a while move. I have copied and pasted the part of the program here. I am thinking because I am trying to run both encoders and line followers at the same time. Any help would be great.

while(SensorValue[righttracker]<950 && SensorValue[lefttracker]<950) //Placing an AND move for the two outside line followers to look for the black line
{
backup(); // the back up is a subroutine setup for the encoders to back up straight.
}


motor[port3] = 0; //motor stop
motor[port2] = 0;

Can you post the code for the backup function?

Hi Tom,

Keep in mind that when you move in reverse, your encoders are probably counting backward. Where moving forward you could have a condition "SensorValue[encoder] < 720", moving in reverse it must be more like "SensorValue[encoder] > -720".

Hope that helps!