Circuit Documentation

Summary

This circuit is designed to control a NEMA 17 stepper motor using an ESP32 microcontroller and an A988 driver. The ESP32 sends control signals to the A988 driver, which in turn drives the stepper motor. A 12V battery is used to power the A988 driver and the stepper motor.

Component List

1. ESP 32 DEVKIT V1 (30 pins)

   • Description: A development board based on the ESP32 microcontroller.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23

2. NEMA 17 HS4401

   • Description: A bipolar stepper motor.
   • Pins: RED (B2), BLACK (B1), BLUE (A2), GREEN (A1)

3. A988 DRIVER

   • Description: A stepper motor driver.
   • Pins: VMOT, GND, 2B, 2A, 1A, 1B, VDD, EN, MS1, MS2, MS3, RST, SLP, STEP, DIR

4. 12V Battery

   • Description: A 12V power source.
   • Pins: +, -

Wiring Details

ESP 32 DEVKIT V1 (30 pins)

• D14 is connected to STEP on the A988 DRIVER.
• D12 is connected to DIR on the A988 DRIVER.
• GND is connected to GND and EN on the A988 DRIVER.
• VIN is connected to MS2, MS3, VDD, and MS1 on the A988 DRIVER.

NEMA 17 HS4401

• RED (B2) is connected to 2A on the A988 DRIVER.
• BLACK (B1) is connected to 2B on the A988 DRIVER.
• BLUE (A2) is connected to 1A on the A988 DRIVER.
• GREEN (A1) is connected to 1B on the A988 DRIVER.

A988 DRIVER

• VMOT is connected to + on the 12V Battery.
• GND is connected to - on the 12V Battery.
• RST is connected to SLP on the A988 DRIVER.

12V Battery

• + is connected to VMOT on the A988 DRIVER.
• - is connected to GND on the A988 DRIVER.

Code Documentation

ESP 32 DEVKIT V1 (30 pins)

/*
 * This Arduino Sketch is designed to control a NEMA 17 stepper motor using
 * an ESP32 microcontroller and an A988 driver. The code initializes the
 * necessary pins and runs the stepper motor in an anticlockwise direction.
 */

#define STEP_PIN 14
#define DIR_PIN 12

void setup() {
  // Set the pins as output
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);

  // Set the direction to anticlockwise
  digitalWrite(DIR_PIN, LOW);
}

void loop() {
  // Rotate the stepper motor
  digitalWrite(STEP_PIN, HIGH);
  delayMicroseconds(1000);
  digitalWrite(STEP_PIN, LOW);
  delayMicroseconds(1000);
}

A988 DRIVER

/*
 * This Arduino Sketch is designed to control a NEMA 17 stepper motor using
 * an ESP32 microcontroller and an A988 driver. The code initializes the
 * necessary pins and runs the stepper motor in an anticlockwise direction.
 */

#define STEP_PIN 14
#define DIR_PIN 12

void setup() {
  // Set the pins as output
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);

  // Set the direction to anticlockwise
  digitalWrite(DIR_PIN, LOW);
}

void loop() {
  // Rotate the stepper motor
  digitalWrite(STEP_PIN, HIGH);
  delayMicroseconds(1000);
  digitalWrite(STEP_PIN, LOW);
  delayMicroseconds(1000);
}

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used to control the stepper motor.