//original source is http://www.geeetech.com/wiki/index.php/Stepper_Motor_5V_4-Phase_5-Wire_%26_ULN2003_Driver_Board_for_Arduino
// Update by Ahmad Shamshiri for RoboJax.com
// Published on March 27, 2017 in Ajax, ON, Canada.
/* Lesson 107-2: Reading voltage from potentiometer and saving it on microSD card
In this lesson we learn how to use mini stepper motor 28BYJ-48 for our project. I am presenting 8 projects
  so you can use it in almost any application. In the video, I have explained the code, shown the full wiring diagram and 
  how to connect the wires, push buttons and breadboard. 
 
 
  Project 1: Running motor (this code)
  Project 2: Controlling stepper motor from Serial Monitor
  Project 3:  Controlling stepper motor using push button STPB-1
  Project 4: Controlling using push button STPB-2  keep pressing
  Project 5: One Revolution using push button STPB-3
  Project 6: Push button Any Angle and speed STPB-4
  Project 7: using multiple buttons to any angles STPB-5 angle, speed and direction
  Project 8: Controlling stepper motor using potentiometer

  * Watch Video instruction for this code:https://youtu.be/TQ7R2bY-MWU
  * 
  * This code is part of Arduino Step by Step Course which starts here:  https://youtu.be/-6qSrDUA5a8
  * 
  * for library of this code visit http://robojax.com/
  * 
 If you found this tutorial helpful, please support me so I can continue creating 
 content like this. Make a donation using PayPal by credit card https://bit.ly/donate-robojax 
 

 
  *  * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
  * This code has been downloaded from Robojax.com
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
 
     This program 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 General Public License for more details.
 
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */


int Pin1 = 10; 
int Pin2 = 11; 
int Pin3 = 12; 
int Pin4 = 13; 
int _step = 0; 
boolean dir = true;// false=clockwise, true=counter clockwise
int count=0;
void setup() 
{ 
 pinMode(Pin1, OUTPUT);  
 pinMode(Pin2, OUTPUT);  
 pinMode(Pin3, OUTPUT);  
 pinMode(Pin4, OUTPUT);  
} 
 void loop() 
{ 
 switch(_step){ 
   case 0: 
     digitalWrite(Pin1, LOW);  
     digitalWrite(Pin2, LOW); 
     digitalWrite(Pin3, LOW); 
     digitalWrite(Pin4, HIGH); 
   break;  
   case 1: 
     digitalWrite(Pin1, LOW);  
     digitalWrite(Pin2, LOW); 
     digitalWrite(Pin3, HIGH); 
     digitalWrite(Pin4, HIGH); 
   break;  
   case 2: 
     digitalWrite(Pin1, LOW);  
     digitalWrite(Pin2, LOW); 
     digitalWrite(Pin3, HIGH); 
     digitalWrite(Pin4, LOW); 
   break;  
   case 3: 
     digitalWrite(Pin1, LOW);  
     digitalWrite(Pin2, HIGH); 
     digitalWrite(Pin3, HIGH); 
     digitalWrite(Pin4, LOW); 
   break;  
   case 4: 
     digitalWrite(Pin1, LOW);  
     digitalWrite(Pin2, HIGH); 
     digitalWrite(Pin3, LOW); 
     digitalWrite(Pin4, LOW); 
   break;  
   case 5: 
     digitalWrite(Pin1, HIGH);  
     digitalWrite(Pin2, HIGH); 
     digitalWrite(Pin3, LOW); 
     digitalWrite(Pin4, LOW); 
   break;  
     case 6: 
     digitalWrite(Pin1, HIGH);  
     digitalWrite(Pin2, LOW); 
     digitalWrite(Pin3, LOW); 
     digitalWrite(Pin4, LOW); 
   break;  
   case 7: 
     digitalWrite(Pin1, HIGH);  
     digitalWrite(Pin2, LOW); 
     digitalWrite(Pin3, LOW); 
     digitalWrite(Pin4, HIGH); 
   break;  
   default: 
     digitalWrite(Pin1, LOW);  
     digitalWrite(Pin2, LOW); 
     digitalWrite(Pin3, LOW); 
     digitalWrite(Pin4, LOW); 
   break;  
 } 
 if(dir){ 
   _step++; 
 }else{ 
   _step--; 
 } 
 if(_step>7){ 
   _step=0; 
 } 
 if(_step<0){ 
   _step=7; 
 } 
 delay(1); 

}