ULN2003 12V Stepper Motor Driver

ULN2003 12V Stepper Motor Driver Component Documentation

Overview

The ULN2003 12V Stepper Motor Driver is a high-voltage, high-current darlington transistor array designed for use in stepper motor applications. It provides a convenient and compact way to drive bipolar stepper motors with a microcontroller or other digital logic device. This component is suitable for use in a wide range of IoT projects, including robotics, automation, and industrial control systems.

Pinout and Connections

The ULN2003 component has a 16-pin DIP package with the following pinout:

| Pin | Function |
| --- | --- |
| 1-8 | Output pins (IN1-IN8) |
| 9-16 | Input pins (VCC, GND, IN1-IN4) |

To use the ULN2003, connect the input pins (IN1-IN4) to the output pins of a microcontroller or other digital logic device. The output pins (IN1-IN8) connect to the stepper motor windings.

Code Examples

### Example 1: Basic Stepper Motor Control using Arduino

This example demonstrates how to use the ULN2003 to control a bipolar stepper motor using an Arduino board.
```cpp
const int motorPins[] = {2, 3, 4, 5}; // ULN2003 input pins (IN1-IN4)
const int stepsPerRevolution = 200; // Number of steps per revolution

void setup() {
  for (int i = 0; i < 4; i++) {
    pinMode(motorPins[i], OUTPUT);
  }
}

void loop() {
  // Rotate the motor clockwise
  for (int i = 0; i < stepsPerRevolution; i++) {
    for (int j = 0; j < 4; j++) {
      digitalWrite(motorPins[j], (j == (i % 4)) ? HIGH : LOW);
    }
    delay(1);
  }
  
  // Rotate the motor counterclockwise
  for (int i = 0; i < stepsPerRevolution; i++) {
    for (int j = 0; j < 4; j++) {
      digitalWrite(motorPins[j], (j == (3 - (i % 4))) ? HIGH : LOW);
    }
    delay(1);
  }
}
```
### Example 2: Half-Step Stepper Motor Control using Raspberry Pi (Python)

This example demonstrates how to use the ULN2003 to control a bipolar stepper motor in half-step mode using a Raspberry Pi.
```python
import RPi.GPIO as GPIO
import time

# ULN2003 input pins (IN1-IN4)
motor_pins = [17, 23, 24, 25]

# Set up GPIO mode
GPIO.setmode(GPIO.BCM)

# Initialize motor pins as outputs
for pin in motor_pins:
    GPIO.setup(pin, GPIO.OUT)

# Half-step sequence
half_step_sequence = [
    [1, 0, 0, 0],
    [1, 1, 0, 0],
    [0, 1, 0, 0],
    [0, 1, 1, 0],
    [0, 0, 1, 0],
    [0, 0, 1, 1],
    [0, 0, 0, 1],
    [1, 0, 0, 1]
]

try:
    while True:
        for step in half_step_sequence:
            for i, pin in enumerate(motor_pins):
                GPIO.output(pin, step[i])
            time.sleep(0.01)

except KeyboardInterrupt:
    GPIO.cleanup()
```
These examples demonstrate the basic connections and code required to use the ULN2003 12V Stepper Motor Driver in various contexts.