void setup() {

//initialize serial communication at 9600 bits per second:

Serial.begin(115200);

//join i2c bus (address optional for master)

Wire.begin();

//Initialize drive chips of stepping motors (Group A and Group B)

stepperA.init();

//Setting stepping motor Group A rotate in positive direction

stepperA.start(0, 20, CW);

}

void loop()

{

//Stepping motor (Group A) rotate in reverse in every 2 seconds

reverse_SA();

delay(2000);

}

Program Function: group A stepper motor (M1A(A+), M1B(A-), M2A(B+), M2B(B-)) reverse the

rotation direction in every 2s.

Functions:

1. Create a stepper motor object.

2. DFRobot_Stepper stepperA(SA) SA represents group A stepper motors (M1A(A+), M

1B(A-), M2A(B+), M2B(B-))

3. Initiate the motor drive, read Product ID and Version ID, and print to the serial port.

4. init()

5. Set angle, speed, direction of the stepper motor rotation and start to rotate.

6. start(angle, speed, dir)

7. angle: set the rotation resolution.

8. The maximum resolution is

0.9°, which means the minimum rotate angle is 0.9°

.