![]() ![]() ![]() By adjusting the duty cycle of the PWM signal, the speed of the motor can be controlled. ![]() Use PWM for speed control: The analogWrite() function in Arduino uses pulse width modulation (PWM) to vary the speed of the motor. Using a power supply that is too weak can result in the motor not spinning or spinning slowly, while using a power supply that is too strong can damage the motor. Without a motor driver, the Arduino may be damaged.Ĭhoose the correct power supply: Make sure to choose a power supply that can provide the correct voltage and current for your DC motor. You can vary the speed of the motor by changing the value passed to the analogWrite() function.Īlways use a motor driver: A motor driver like the L293D IC is necessary to protect the Arduino from the high current and voltage required to drive a DC motor. This code sets the direction of the motor to reverse by setting the opposite input pin high and the other input pin low.Īfter writing the code, connect the Arduino to your computer using a USB cable, and upload the code to the Arduino using the Arduino IDE.Ĭonnect the power supply (battery or external adapter) to the breadboard and connect the positive and negative terminals to the appropriate pins on the motor driver IC.Īfter connecting everything, power on the Arduino and the motor should start rotating in the desired direction. Here is an example code to rotate the DC motor in the opposite direction: The analogWrite() function is used to vary the speed of the motor, with a value of 255 providing maximum speed. The code above sets up the three required pins as outputs and then sets the direction of the motor to forward by setting one input pin high and the other input pin low. Step 2 (continued): Write the Arduino code Step 1: Connect the motor driver IC to the ArduinoĬonnect pin 1 (EN1) of the L293D IC to pin 9 (PWM) of the Arduino, pin 2 (IN1) to pin 8 of the Arduino, pin 3 (OUT1) to the positive terminal of the DC motor, pin 4 (GND) to GND of the Arduino, pin 5 (GND) to GND of the power supply, pin 6 (OUT2) to the negative terminal of the DC motor, pin 7 (IN2) to pin 7 of the Arduino, pin 8 (EN2) to pin 10 (PWM) of the Arduino, pin 9 (MOTOR A) to the positive terminal of the DC motor, pin 10 (MOTOR A) to the negative terminal of the DC motor, pin 11 (MOTOR B) to the positive terminal of the DC motor, pin 12 (MOTOR B) to the negative terminal of the DC motor, pin 13 (GND) to GND of the power supply, pin 14 (Vs) to the positive terminal of the power supply, and pin 15 (Vss) to 5V of the Arduino. To control a DC motor with Arduino using the L293D motor driver IC, follow these steps: The L293D motor driver IC has the following pin configuration: The H-bridge configuration allows the direction of the motor to be controlled by the Arduino. It is a dual H-bridge IC that can drive two DC motors or one stepper motor. The L293D motor driver IC is a popular choice for controlling DC motors with Arduino. ![]()
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