10. Output Devices

Stepper Motor Control with Xiao RP2040 and A4988 Driver. I Know im still doing step motors but they're fun

For this assignment, I used a Seeed Studio Xiao RP2040 microcontroller to control a stepper motor using an A4988 stepper motor driver.

Components Used

  • Xiao RP2040
  • A4988 Stepper Motor Driver
  • NEMA 17 Stepper Motor
  • External 12V Power Supply

PCB and diagram

Connections

    Xiao RP2040  →  A4988 Driver
    --------------------------
    3.3V        →  VDD
    GND         →  GND
    D0          →  STEP
    D1          →  DIR
    Direct from PS →  A4988 VMOT (via 12V external supply)
    NEMA17 coils   →  A4988 OUT1, OUT2, OUT3, OUT4

Code

Below is the Arduino code used to control the stepper motor.


    #define STEP_PIN D0
    #define DIR_PIN D1   
    
    void setup() {
        pinMode(STEP_PIN, OUTPUT);
        pinMode(DIR_PIN, OUTPUT);
    }
    
    void moverMotor(int pasos, int velocidad) {
        for (int i = 0; i < pasos; i++) {
            digitalWrite(STEP_PIN, HIGH);
            delayMicroseconds(velocidad);  
            digitalWrite(STEP_PIN, LOW);
            delayMicroseconds(velocidad);
        }
    }
    
    void loop() {
        digitalWrite(DIR_PIN, HIGH); 
        moverMotor(200, 1000); 
        delay(1000);
    
        digitalWrite(DIR_PIN, LOW); 
        moverMotor(200, 1000); 
        delay(1000);
    }

Results

The motor successfully rotates in one direction for one full revolution and then changes direction after a short delay.

Conclusion

This project demonstrates how to use our PCB we manufactured with the Xiao RP2040 and A4988 stepper motor driver.

Useful links