1. Raspberry Pi Pico W Overview

The Raspberry Pi Pico W is a low-cost microcontroller board based on the RP2040 chip. It features:

• Dual-core Arm Cortex-M0+ processor
• 264KB of SRAM
• 2MB of flash memory
• Built-in Wi-Fi module (Infineon CYW43439)
• Multiple GPIOs with PWM, ADC, SPI, I2C, and UART support

The Pico W’s datasheet outlines power management, GPIO assignments, and communication protocols essential for embedded systems.

2. Components

• Arduino Board
• A4988 Stepper Motor Driver
• Stepper Motor
• Potentiometer
• External Power Supply

3. Circuit Connections

The stepper motor is connected to the A4988 driver, which is controlled by the Arduino.

• STEP (A4988) → Pin 9
• DIR (A4988) → Pin 8
• POT (Analog Input) → 28

4. Arduino Code

        
#define DIR_PIN 2
#define STEP_PIN 3
#define POT_PIN 28 

void setup() {
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);
  digitalWrite(STEP_PIN, LOW);
}

void loop() {
  int potValue = analogRead(POT_PIN);
  int stepDelay = map(potValue, 0, 1023, 1, 10);


  digitalWrite(DIR_PIN, HIGH);
  for (int i = 0; i < 200; i++) {
    digitalWrite(STEP_PIN, HIGH);
    digitalWrite(STEP_PIN, LOW);
    delay(stepDelay);
  }

  delay(500); 


  digitalWrite(DIR_PIN, LOW);
  for (int i = 0; i < 200; i++) {
    digitalWrite(STEP_PIN, HIGH);
    digitalWrite(STEP_PIN, LOW);
    delay(stepDelay);
  }

  delay(1000); 
}