Command to release pins which have setup for DC motor
Board pointer, to indicate which board to use to differentiate one board from another
ID in which the motor has been connected
Arduino board does not deliver enough power, so it is necessary to use a H-bridge circuit/IC to control the motor. There are several types of H-bridge IC that do not all operate on the same principle. For example, the L298 requires the use of a PWM signal with current sense. The L293 uses two PWM to set the speed and direction. Ready-to-use Shields are also available.
Remember that the PWM is 8-bit (0 to 255). The input of the block could accept any value, but it would saturate at +- 255.