1. Creating an Arm

2. You need to use the 3rd motor to create an arm for your robot.

3. Thing to think about when programming the arm
When one of the motors is programmed to move in rotations, the motor will only stop moving when exactly that many rotations have been made. This causes problems when the motor gets stuck or blocked because the motor will continue trying to move and will not go on to the next programming step until the program is aborted using the dark gray button on the NXT
So what is the solution?

4. To remedy this, the arm can be either programmed in seconds
To remedy this, the arm can be either programmed in seconds. This means that if the arm gets blocked, it will stop trying to lift and move on to the next step.

5. Different uses of the 3rd motor
Helping Hands

6. Fork Lift