/*
 * This is the Arduino code to control the speed of a motor using an L293D DC motor driver.

Watch instructions for this video: https://youtu.be/akQoGNUzhHI

 // Written for Robojax.com video 

 * Code is available at http://robojax.com/learn/arduino

 * 
 // Written by Ahmad S. for Robojax.com on 
// August 11, 2018 at 13:23 in Ajax, Ontario, Canada
// This code is AS IS without warranty. You may share it if you keep this note with the code.
*/
// DC motor control
#define P1A 10 // define pin 10 as P1A
#define P2A 11 // define pin 11 as P2A
#define EN12 9 // define pin 9 as the 1,2EN enable

const int speedStep =15;
const int speedDelay = 1000;// delay between speed increment

void setup() {
  // L293 Motor Control Code by Robojax.com 20180811
  Serial.begin(9600);// setup Serial Monitor to display information
  pinMode(P1A, OUTPUT);// define pin as OUTPUT for P1A
  pinMode(P2A, OUTPUT);// define pin as OUTPUT for P2A
  pinMode(EN12, OUTPUT);// define pin as OUTPUT for 1,2EN

  Serial.println("Robojax");
  Serial.println("L293D Motor Speed Control");
  
  // L293 Motor Control Code by Robojax.com 20180811   
}

void loop() {
  // L293D Motor Control Code by Robojax.com 20180811

 for(int speed=0; speed<=255; speed +=speedStep)
 {
  L293D('L',speed, 0);// 
  delay(speedDelay);// delay between each step
 }

  delay(50);// 50 millisecond delay
  // L293D Motor Control Code by Robojax.com 20180810 
}//loop end




/*
 * L293D(char dir,int spd, int en)
 * dir is a character: 'L' for clockwise direction
 *  or 'R' for counter-clockwise direction
 *  en is an integer: 1 to rotate, 0 to stop
 *  spd is the speed value from 0 to 255
 */
void L293D(char dir,int spd, int en)
{
  if(dir =='L')
  {
    if(en ==0){
       Serial.println("CW Motor Stopped");
    }else{
       Serial.print("Rotating CW: "); 
       Serial.println(spd);//print actual speed value        
    }
    digitalWrite(EN12 ,en);// Enable 1A and 2A 
    analogWrite(P1A,spd);// send PWM with spd value to P1A
    digitalWrite(P2A,LOW);// LOW signal to P2A       
   
  }else{
    if(en ==0){
       Serial.println("CCW Motor Stopped");
    }else{
       Serial.print("Rotating CCW: "); 
       Serial.println(spd);//print actual speed value     
    }    
    digitalWrite(EN12 ,en);// Disable 1A and 2A    
    digitalWrite(P1A,LOW);// Keep this pin LOW
    analogWrite(P2A,spd);// send PWM with spd value to  P2A  
  }
}//L293D end

++
/*

 * This is the Arduino code to control the speed of a motor using an L293D DC motor driver.
 * This code will control the motor with different directions and speed.

Watch instructions for this video: https://youtu.be/akQoGNUzhHI

 // Written for Robojax.com video 

 * Code is available at http://robojax.com/learn/arduino

 * 
 // Written by Ahmad Shamshiri for Robojax.com on 
// August 11, 2018 at 13:23 in Ajax, Ontario, Canada.
// This code is AS IS without warranty. You may share it if you keep this note with the code.
*/
// DC motor control
#define P1A 10 // define pin 10 as P1A
#define P2A 11 // define pin 11 as P2A
#define EN12 9 // define pin 9 as the 1,2EN enable

const int speedStep =15;
const int speedDelay = 1000;// delay between speed increment

void setup() {
  // L293 Motor Control Code by Robojax.com 20180811
  Serial.begin(9600);// setup Serial Monitor to display information
  pinMode(P1A, OUTPUT);// define pin as OUTPUT for P1A
  pinMode(P2A, OUTPUT);// define pin as OUTPUT for P2A
  pinMode(EN12, OUTPUT);// define pin as OUTPUT for 1,2EN

  Serial.println("Robojax");
  Serial.println("L293D Motor Speed Control");
  
  // L293 Motor Control Code by Robojax.com 20180811   
}

void loop() {
  // L293D Motor Control Code by Robojax.com 20180811


  L293D('L',255, 1);// maximum speed to the LEFT
  delay(3000);// wait for 3 seconds

  L293D('L',255, 0);// stop motor
  delay(2000);// wait for 2 seconds

  L293D('L',127, 1);// half speed to the LEFT
  delay(3000);// wait for 3 seconds  

  L293D('L',255, 0);// stop motor
  delay(2000);// wait for 2 seconds

  L293D('R',90, 1);// slow to the RIGHT
  delay(3000);// wait for 3 seconds  

  L293D('L',255, 0);// stop motor
  delay(2000);// wait for 2 seconds

  // L293D Motor Control Code by Robojax.com 20180810 
}//loop end




/*
 * L293D(char dir,int spd, int en)
 * dir is a character: 'L' for clockwise (CW) direction
 *  or 'R' for counter-clockwise (CCW) direction.
 *  en is an integer: 1 to rotate, 0 to stop.
 *  spd is the speed value from 0 to 255.
 */
void L293D(char dir,int spd, int en)
{
  if(dir =='L')
  {
    if(en ==0){
       Serial.println("CW Motor Stopped");
    }else{
       Serial.print("Rotating CW: "); 
       Serial.println(spd);//print actual speed value        
    }
    digitalWrite(EN12 ,en);// Enable 1A and 2A 
    analogWrite(P1A,spd);// send PWM with spd value to P1A
    digitalWrite(P2A,LOW);// LOW signal to P2A       
   
  }else{
    if(en ==0){
       Serial.println("CCW Motor Stopped");
    }else{
       Serial.print("Rotating CCW: "); 
       Serial.println(spd);//print actual speed value     
    }    
    digitalWrite(EN12 ,en);//enable 1A and 2A    
    digitalWrite(P1A,LOW);// Keep it LOW P1A
    analogWrite(P2A,spd);// send PWM with spd value to  P2A  
  }
}//L293D end