DRV8825 Stepper Motor Driver Module Documentation
The DRV8825 Stepper Motor Driver Module is a high-current, microstepping driver designed for applications requiring precise control of stepper motors. This module is based on the Texas Instruments DRV8825 IC, which provides advanced features such as adjustable current limiting, overcurrent protection, and microstepping.
| Pin | Function |
| --- | --- |
| VMOT | Motor Voltage (Up to 45V) |
| GND | Ground |
| DIR | Direction Input |
| STEP | Step Input |
| ENABLE | Enable Input (Active Low) |
| MS1, MS2, MS3 | Microstepping Select Inputs |
| RST | Reset Input (Active Low) |
Example 1: Basic Stepper Motor Control using Arduino
This example demonstrates how to control a stepper motor using the DRV8825 module with an Arduino board.
```cpp
#include <arduino.h>
#define DIR_PIN 2
#define STEP_PIN 3
#define ENABLE_PIN 4
void setup() {
pinMode(DIR_PIN, OUTPUT);
pinMode(STEP_PIN, OUTPUT);
pinMode(ENABLE_PIN, OUTPUT);
digitalWrite(ENABLE_PIN, LOW); // Enable the driver
}
void loop() {
digitalWrite(DIR_PIN, HIGH); // Set direction (clockwise)
for (int i = 0; i < 200; i++) {
digitalWrite(STEP_PIN, HIGH);
delayMicroseconds(500);
digitalWrite(STEP_PIN, LOW);
delayMicroseconds(500);
}
digitalWrite(DIR_PIN, LOW); // Set direction (counterclockwise)
for (int i = 0; i < 200; i++) {
digitalWrite(STEP_PIN, HIGH);
delayMicroseconds(500);
digitalWrite(STEP_PIN, LOW);
delayMicroseconds(500);
}
}
```
Example 2: Microstepping with Raspberry Pi (Python)
This example demonstrates how to control a stepper motor using the DRV8825 module with a Raspberry Pi board, taking advantage of microstepping.
```python
import RPi.GPIO as GPIO
import time
MS1_PIN = 17
MS2_PIN = 23
MS3_PIN = 24
DIR_PIN = 25
STEP_PIN = 8
ENABLE_PIN = 7
GPIO.setup(MS1_PIN, GPIO.OUT)
GPIO.setup(MS2_PIN, GPIO.OUT)
GPIO.setup(MS3_PIN, GPIO.OUT)
GPIO.setup(DIR_PIN, GPIO.OUT)
GPIO.setup(STEP_PIN, GPIO.OUT)
GPIO.setup(ENABLE_PIN, GPIO.OUT)
# Set microstepping mode (1/4 step)
GPIO.output(MS1_PIN, GPIO.HIGH)
GPIO.output(MS2_PIN, GPIO.HIGH)
GPIO.output(MS3_PIN, GPIO.LOW)
GPIO.output(ENABLE_PIN, GPIO.LOW) # Enable the driver
while True:
GPIO.output(DIR_PIN, GPIO.HIGH) # Set direction (clockwise)
for i in range(400):
GPIO.output(STEP_PIN, GPIO.HIGH)
time.sleep(0.001)
GPIO.output(STEP_PIN, GPIO.LOW)
time.sleep(0.001)
GPIO.output(DIR_PIN, GPIO.LOW) # Set direction (counterclockwise)
for i in range(400):
GPIO.output(STEP_PIN, GPIO.HIGH)
time.sleep(0.001)
GPIO.output(STEP_PIN, GPIO.LOW)
time.sleep(0.001)
```
Example 3: Adjusting Current Limit using I2C (Arduino)
This example demonstrates how to adjust the current limit of the DRV8825 module using I2C communication with an Arduino board.
#define DRV8825_I2C_ADDRESS 0x57
void setup() {
Wire.begin();
}
void loop() {
// Set current limit to 1.5A
Wire.beginTransmission(DRV8825_I2C_ADDRESS);
Wire.write(0x1C); // Register address for current limit
Wire.write(0x05); // Value for 1.5A current limit
Wire.endTransmission();
// Set current limit to 2.5A
Wire.beginTransmission(DRV8825_I2C_ADDRESS);
Wire.write(0x1C); // Register address for current limit
Wire.write(0x09); // Value for 2.5A current limit
Wire.endTransmission();
Note: Make sure to adjust the pin connections and I2C addresses according to your specific setup and requirements. Additionally, consult the DRV8825 datasheet for detailed information on microstepping, current limiting, and other advanced features.
