ENA and ENB control motor_1 and motor_2 respectively. Similarly, IN3 and IN4 are Motor_2 direction control pins of the second internal H-Bridge of the L298N motor driver. IN1 and IN2 are Motor_1 direction control pins of internal H-Bridge. There are two terminals two connection two DC motors. But if we interchange the connection of the battery by connecting opposite polarity, the DC motor will start rotating in another direction as shown in the simulation below. For instance, if we connect the positive terminal of battery with one terminal and the negative terminal of battery with another terminal of DC motor, it will start rotating in clockwise direction. The polarity of input voltage source determines the direction of rotation of a DC motor. Direction ControlĪs you know that in case of DC power supply, there is a concept of polarity such as positive and negative terminals of a battery. We will discuss it in later sections of this tutorial. Usually, a pulse width modulation technique is used to generate a variable dc voltage from constant dc voltage source. In short, we can control the speed of rotation by giving a variable input voltage to a DC motor. Similarly, if we apply 6 volts, the DC motor will run at its highest rated speed. 
If we apply 3 volts input, the motor will run at its lowest rated speed. For example, If the operating voltage range of a motor is between 3 – 6 volts. One important point to note here is that if we want to control the speed of a DC motor, we will need to provide a variable voltage to the DC motor. But the voltage should be within the operating voltage range. The higher the input voltage, the higher will be the rotational speed of the motor. The speed of rotation of motors is directly related to the input voltage. Therefore, we apply a DC voltage to drive DC motors. But, both types require a dc voltage to operate. They are available in direct drive or geared types. If you are looking to develop a robot such as a line follower robot, obstacle avoidance robot, these DC motors will be the first choice for you.
DC Motor Interfacing with TM4C123 Tiva LaunchpadĭC motors are electro-mechanical machines which convert electrical energy into mechanical (rotational) energy.
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