Arduino Tutorial - stepper motor with bluetooth

This Blogger is the written version of my "Arduino : How To Control Stepper Motor via Bluetooth (with Smartphone)"

In this project we will control a Stepper motor with a smartphone via bluetooth. My YouTube Channel First, you should see the following Instructable: How to Control a Stepper Motor With L293D Motor Driver

 Hardware Required

- Bluetooth Module ( for example : HC05 or HC06 ) 

- Jumper Cables

Circuit & Connections

Bluetooth Modul VCC to Arduino 5V

(at the same time if you want, you can use 3V3)

Bluetooth Modul GND to Arduino GND

Bluetooth Modul RX to Arduino TX

Bluetooth Modul TX to Arduino RX

Create Application

Get the Application (Google Drive)

https://drive.google.com/file/d/0B8SAF49tU-QoMnBaRkYtMXpqVVk/view?usp=sharing

 Get Code :-

int step_pin_1 = 8; 
int step_pin_2 = 9; 
int step_pin_3 = 10; 
int step_pin_4 = 11;

float delay_time;
int value_bluetooth = 0;

 
String readString;

void setup()
{
Serial.begin(9600);
}

void loop() 
{
   
   while (Serial.available()){
    char c= Serial.read();
    readString+=c;
  }

  if(readString.length() >0) {
   
    value_bluetooth =readString.toInt();

   if (value_bluetooth >  0   ){
      delay_time = 15;  
    }
    else
    {
      delay_time=0;
      }

Serial.println(value_bluetooth);

 
digitalWrite(8, HIGH); digitalWrite(step_pin_2, HIGH); digitalWrite(step_pin_3, LOW); digitalWrite(step_pin_4, LOW);   
delay(delay_time);


digitalWrite(step_pin_1, LOW); digitalWrite(step_pin_2, HIGH); digitalWrite(step_pin_3, HIGH); digitalWrite(step_pin_4, LOW);  
delay(delay_time);

digitalWrite(step_pin_1, LOW); digitalWrite(step_pin_2, LOW); digitalWrite(step_pin_3, HIGH); digitalWrite(step_pin_4, HIGH);  
delay(delay_time);
 
digitalWrite(step_pin_1, HIGH); digitalWrite(step_pin_2, LOW); digitalWrite(step_pin_3, LOW); digitalWrite(step_pin_4, HIGH);  
delay(delay_time); 


readString="";

}

}