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Drive a DC Motor With Arduino DUENovember 5, 2012

Arduino DUE and MotorshieldThis example shows the simplest thing you can do with an Arduino Due and an Arduino Motor Shield, driving a DC motor in forward and backward directions.

Hardware Required

Arduino Due
Arduino Motor Shield
DC motor
Wall wart power supply

Circuit

To build the circuit you need to mount the Arduino Motor Shield on top of the Arduino Due. Then you have to connect the two wires that comes out of the DC motor to the screw drivers terminals of the Motor Shield channel A. Last thing connect your wall wart power supply adapter to the DC connector of the Arduino Due. You must choose it respecting the voltage requirements of your DC motor. With the fan that we used in this example we provided 12V to the board.

Then plug your Arduino board into your computer, start the Arduino IDE 1.5, and enter the code below.

Code

const int
PWM_A   = 3,
DIR_A   = 12,
BRAKE_A = 9,
SNS_A   = A0;

void setup() {
// Configure the A output
pinMode(BRAKE_A, OUTPUT);  // Brake pin on channel A
pinMode(DIR_A, OUTPUT);    // Direction pin on channel A

// Open Serial communication
Serial.begin(9600);
Serial.println("Motor shield DC motor Test:\n");
}

void loop() {

// Set the outputs to run the motor forward

digitalWrite(BRAKE_A, LOW);  // setting brake LOW disable motor brake
digitalWrite(DIR_A, HIGH);   // setting direction to HIGH the motor will spin forward

analogWrite(PWM_A, 255);     // Set the speed of the motor, 255 is the maximum value

delay(5000);                 // hold the motor at full speed for 5 seconds
Serial.print("current consumption at full speed: ");
Serial.println(analogRead(SNS_A));

// Brake the motor

Serial.println("Start braking\n");
// raising the brake pin the motor will stop faster than the stop by inertia
digitalWrite(BRAKE_A, HIGH);  // raise the brake
delay(5000);

// Set the outputs to run the motor backward

Serial.println("Backward");
digitalWrite(BRAKE_A, LOW);  // setting againg the brake LOW to disable motor brake
digitalWrite(DIR_A, LOW);    // now change the direction to backward setting LOW the DIR_A pin

analogWrite(PWM_A, 255);     // Set the speed of the motor

delay(5000);
Serial.print("current consumption backward: ");
Serial.println(analogRead(SNS_A));

// now stop the motor by inertia, the motor will stop slower than with the brake function
analogWrite(PWM_A, 0);       // turn off power to the motor

Serial.print("current brake: ");
Serial.println(analogRead(A0));
Serial.println("End of the motor shield test with DC motors. Thank you!");

while(1);
}

Via and Source: Arduino Blog

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