We got our robot running but now when we turn it on it will not stop running. We do not know how to solve this problem. It is like the robot is uncontrolable when turned on.

Could you please share your program on the forum? Seeing the code will help us determine what's going wrong.

we have only tried to download the sample program. "motor port 3"- also, should the motors have a two prong end or a three prong end.

Help, we have the same problem using the same sample code. It appears we cannot now download any other program. We have also used motors with two prongs.

All that the Motor Port 3 Forward sample program should do is turn on the motor connected to the VEX Cortex MOTOR Port 3 for three seconds. In order for the robot to perform more than that simple task, more code must be added. I would recommend following the videos in the Movement section of the VEX Cortex Video Trainer for detailed instructions on how to do so: http://www.education.rec.ri.cmu.edu/pro ... index.html

Two wire (or prong) motors can be directly connected to the Cortex on ports 1 and 10. If you plug them in there, you must reference them as port1 and port10, instead of port2 and port3, like in many of the sample programs. The two wire motors can also be connected to ports 2-9 indirectly using one of the Motor Controller 29 wires.