ESP8266 Community Forum

Posted: **Sat Sep 24, 2016 11:25 am**

I am at the moment trying to make a stepper motor move with the help of wemos d1 mini.

The arduino interact with the motor through the motor driver. The driver only is given a 5v, step signal, enable signal and direction signal.

According to the datasheet shall these signal be timed as such.

The complete datasheet can be found http://www.sainsmart.com/zen/documents/20-019-201/ST330%20%20Stepper%20Motor%20Driver%20Board%20User%20Manual.pdf

I wrote some code which should comply with the timing which can be seen here

.cpp

Code: Select all

void stepper_motor::step_pwm()
{
    
    digitalWrite(en_pin,HIGH);
    
    delay(0.005);
  
    digitalWrite(dir_pin,LOW);

    delay(0.005);

    while(1)
    {
      digitalWrite(step_pin,LOW);
      delay(1);
      digitalWrite(step_pin,HIGH);
      delay(1);
    }
  
}

.h

Code: Select all

/* Class: stepper_motor
 * Info: contains the setup, and primary interface to control
 * the stepper motor
 *  
 * stepper_motor(): constructor -  setup the connection to the control board
 * void step_pwm():  Moves the tilt - uses the bool to determine the direction. 
 * bool alive_bool: Is either high (1) or low (0), used for the alive void. 
 */

#ifndef stepper_motor_h
#define stepper_motor_h

#include "Arduino.h"
#include "pins_arduino.h"

#define step_pin  D1
#define dir_pin   D2
#define en_pin    D3
#define max_step  200

 class stepper_motor
{
  public:
    stepper_motor();
    void alive();
    void step_pwm();
  private:
    bool alive_bool;
    bool position_bool;
    int step_count;
};

#endif

When i execute my program stalls the motor, but when i unplug enable signal begins the motor to spin in one direction, and when i unplug the direction signal spin it the other way. I can't codewise change the direction of the stepper motor, only by either pulling the pin on or off.

This problem seemed to weird to get a hold, which made me think whether it could be due to pin_mapping.h which i use to declare which pin I want to use.

The pin_mapping.h is the one available on github.

Code: Select all

/*
  pins_arduino.h - Pin definition functions for Arduino
  Part of Arduino - http://www.arduino.cc/

  Copyright (c) 2007 David A. Mellis
  Modified for ESP8266 platform by Ivan Grokhotkov, 2014-2015.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General
  Public License along with this library; if not, write to the
  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  Boston, MA  02111-1307  USA

  $Id: wiring.h 249 2007-02-03 16:52:51Z mellis $
*/

#ifndef Pins_Arduino_h
#define Pins_Arduino_h

#include "../generic/common.h"

static const uint8_t SDA = 4;
static const uint8_t SCL = 5;

static const uint8_t LED_BUILTIN = 2;
static const uint8_t BUILTIN_LED = 2;

static const uint8_t D0   = 16;
static const uint8_t D1   = 5;
static const uint8_t D2   = 4;
static const uint8_t D3   = 0;
static const uint8_t D4   = 2;
static const uint8_t D5   = 14;
static const uint8_t D6   = 12;
static const uint8_t D7   = 13;
static const uint8_t D8   = 15;
static const uint8_t RX   = 3;
static const uint8_t TX   = 1;

#endif /* Pins_Arduino_h */

So my question is... is this pin_mapping.h fully compatible with Wemos d1 mini ?

ESP8266 Community Forum

Making a stepper motor move

Making a stepper motor move