This circuit is designed to control a stepper motor using an ESP32 microcontroller. The stepper motor is driven by a ULN2003A driver board, which is in turn controlled by a 74HC595 shift register. The circuit allows for the motor to move forward and backward with 2048 steps per revolution at a speed of 5 steps per second. The ESP32 microcontroller receives commands via serial communication to control the motor's direction and number of steps.
/*
* This Arduino sketch controls a stepper motor using an ESP32 microcontroller.
* The stepper motor is driven by a ULN2003A driver board, which is controlled
* via a 74HC595 shift register. The motor will move forward and backward with
* 2048 steps per revolution and a speed of 5 steps per second.
*/
#include <Stepper.h>
// Define the control pins for the stepper motor
#define DATA_PIN 12
#define LATCH_PIN 14
#define CLOCK_PIN 27
// Number of steps per revolution
const int stepsPerRevolution = 2048;
// Initialize the Stepper library
Stepper stepper(stepsPerRevolution, DATA_PIN, CLOCK_PIN, LATCH_PIN);
void setup() {
Serial.begin(115200); // Initialize serial communication
stepper.setSpeed(5); // Set the speed to 5 steps per second
}
void loop() {
if (Serial.available() > 0) {
String command = Serial.readStringUntil('\n');
processCommand(command);
}
}
void processCommand(String command) {
command.trim();
if (command.startsWith("F")) {
int steps = command.substring(1).toInt();
moveMotor(steps);
} else if (command.startsWith("B")) {
int steps = command.substring(1).toInt();
moveMotor(-steps);
}
}
void moveMotor(int steps) {
stepper.step(steps);
}
This code is designed to be uploaded to the ESP32 microcontroller. It sets up the stepper motor with the defined pins and initializes serial communication. The loop
function listens for serial commands to move the motor forward (F) or backward (B) by a specified number of steps. The moveMotor
function executes the movement command by stepping the motor the given number of steps.