Two DC Motors and an Arduino Uno are connected as described above along with an external power supply. Thats why you need to use separate chips to sort as valves that control how the engine spins. You do not need an IC that is specifically labeled or marketed as a stepper control unit. All types except TLE4205G offer over temperature and over current protection as well as over and under voltage locking. It is available in 3 stack lengths delivering from 637 to 1700 ounce inches of torque.Two DC motors and an Arduino Uno are connected as described above along with an external power supply.This is why you have to use separate chips to sort of act as valves that control how the motor spins.You dont need an IC that is specifically labeled or marketed as a stepper-control device.All types except TLE4205G offer over temperature and over current protection as well as over and under voltage lockout.It is available in 3 stack lengths delivering from 637 to 1700 ounce inches of torque.