A stepper motor is used to turn the camera to the left or right. A stepper motor is a motor which can turn in steps. Stepper motor are capable of generating relatively high torque. We have used 12v stepper motors which take 50 steps of 7.5 degrees to make one revolution. A driver chip is used to send commands to the chip.
Direction tells the motor in which direction it is to make the movement, left or right.
Reset function sends the motor back to its original start position. Description of parallel port. The parallel port is used to control the device. Voltage of 0 or 5 volts can be sent to these pins. Using a standard parallel port set up it is therefore possible to control two stepper motors.