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The 28BYJ-48 stepper motor is a small, low-cost stepper motor that is commonly used in small hobby and robotic projects. It is a four-phase, five-wire stepper motor that is driven by a ULN2003 driver IC. The motor has a step angle of 5.625 degrees per step, meaning it takes 64 steps to complete a full rotation. The motor’s maximum torque is 34.3 mNm, so it is not suitable for heavy loads or high-precision applications.
To control a 28BYJ-48 stepper motor using an ESP32 microcontroller and MicroPython, you can follow these steps:
1- Connect the stepper motor to the ESP32 using a ULN2003 driver board. The ULN2003 driver board can be used to provide the necessary current and voltage to the stepper motor.
2- Install the necessary libraries for the ESP32 and the stepper motor driver board. You can use the "upydev" library to connect to the ESP32 board and the "stepper" library to control the stepper motor.
3- Create a Python script in MicroPython that initializes the pins on the ESP32 that are connected to the ULN2003 driver board. You can use the "Pin" class in MicroPython to configure the pins.
4- Initialize the stepper motor using the "Stepper" class from the "stepper" library. You will need to specify the number of steps per revolution for the 28BYJ-48 stepper motor, which is 2048.
5- Write a loop that controls the movement of the stepper motor. You can use the "step" method of the "Stepper" class to move the stepper motor in a specific direction and by a certain number of steps.
Here's an example code:
from machine import Pin
from upydev.device import Device
from stepper import Stepper
# Initialize the ESP32 board
dev = Device('esp32')
dev.debug = False
# Configure the pins for the ULN2003 driver board
coil_A_1_pin = Pin(2, Pin.OUT)
coil_A_2_pin = Pin(0, Pin.OUT)
coil_B_1_pin = Pin(4, Pin.OUT)
coil_B_2_pin = Pin(5, Pin.OUT)
# Initialize the stepper motor
stepper = Stepper(2048, coil_A_1_pin, coil_A_2_pin, coil_B_1_pin, coil_B_2_pin)
# Move the stepper motor forward by 200 steps
for i in range(200):
stepper.step(1)
# Move the stepper motor backward by 200 steps
for i in range(200):
stepper.step(-1)
