Example Code for Arduino-Motor Control

Hardware Preparation

• DFRduino UNO x1, Purchase Link: arduino UNO
• DFR0399 Gear Motor x1, Purchase Link: DFR0399

Software Preparation

• Arduino IDE Click to Download Arduino IDE from Arduino®

Wiring Diagram

Other Preparation Work

"0~180" degree corresponds to the pulse width signal "500us~2500us".
When we give a value between 81~99° (1400~1600us), the motor will stop;
When we give a value less than 81° (1400us), the motor rotates clockwise, the smaller the value, the faster the speed, 0° (500us) is the maximum speed;
When we give a value greater than 99° (1600us), the motor rotates anticlockwise, the larger the value, the faster the speed, 180 ° (2500us) is the maximum speed;
Since every motor has a little difference, we enlarge the stop range to ensure that the motor can be stopped correctly.

Sample Code

#include <Servo.h>

#define speed_maxP 0   //Clockwise rotation (Max speed)
#define speed_maxN 180 //Anticlockwise rotation (Max speed)
#define speed_stop  90 //Stop

Servo  mymotor;  // create servo object to control a servo (my motor)
                 // twelve servo objects can be created on most boards

int pos=0;
void setup()
{
  mymotor.attach(9);  //attaches the motor on pin 9 to the servo object
}
void loop()
{
  /**********Using 180 degree servo library to control N20 motor******************************/
  mymotor.write(speed_stop);     //Stop
  delay(1000);                   //delay 1s
  mymotor.write(speed_maxP);     //Clockwise rotation
  delay(2000);                   //delay 2s
  mymotor.write(speed_maxN);     //Anticlockwise rotation
  delay(2000);                   //delay 2s
  for(pos=speed_maxP;pos<speed_maxN;pos++)  //slow down, change the direction and speed up
  {
    mymotor.write(pos);
    delay(50);
  }
}

Result

When this Arduino code runs, the N20 motor will perform a repeating cycle of movements as follows:

First, it stops rotating for 1 second.
Then, it spins clockwise at maximum speed for 2 seconds.
Next, it switches to spinning anticlockwise at maximum speed for another 2 seconds.
Finally, it smoothly transitions from maximum clockwise speed to maximum anticlockwise speed: the motor gradually slows down until it stops, then immediately gradually speeds up in the opposite (anticlockwise) direction. This smooth transition takes about 9 seconds.

The entire above cycle repeats indefinitely until the Arduino is powered off or new code is uploaded.