/*
 This is an example code for the SN754410 H-BRIDGE motor controller from PCBGadgets
 This example code is in the public domain.
 */

// define motor1 control pins on Arduino Uno board.
int M1_EN = 9;//motor 1 enable (EN pin)
int M1_L1 = 10;//motor 1 logic pin1 ( L1 pin) 
int M1_L2 = 11;//motor 1 logic pin2 ( L2 pin)

// Pwm variable Max value = 255
int speed_value=200;

// the setup routine runs only once when you reset the microcontroller.
void setup() {                
  // initialize the digital pin as an output.
  pinMode(M1_EN, OUTPUT);  
  pinMode(M1_L1, OUTPUT); 
  pinMode(M1_L2, OUTPUT);    
}

// the loop routine runs forever:
void loop() 
{  
  // enable motor1 
  analogWrite(M1_EN, speed_value); 
  // set motor1 logic1 (L1) and logic2 (L2) pins to turn the motor in one direction
  digitalWrite(M1_L1, HIGH);    
  digitalWrite(M1_L2, LOW);
  // wait 3 seconds
  delay(3000);       
  //turn the motor the other direction by reversing L1 and L2 pins
  digitalWrite(M1_L1, LOW);
  digitalWrite(M1_L2, HIGH);
  delay(3000); 
}