How to make two wheels turn only for a particular amount of time? I am trying to make a robot turn (dc motors are being used) back 180 degrees. So I used an l289n for it and made one wheel turn clockwise and vice-versa. 
But as I wan't it to make only a 180 degrees turn, I wanted to set an amount of time for it to turn.  Is there any other way to do the same thing, if yes, please tell, if no, help me...
Use the delay() function.

Pseudo code as follows:

1) Turn clockwise motor on;
2) Turn counterclockwise motor on;
3) delay(&lt;time&gt;);
4) Turn CW motor off;
5) Turn CCW motor off.