#define L9110S_B_IA 11 // D10 --> Motor B Input A --> MOTOR B +
#define L9110S_B_IB 10 // D11 --> Motor B Input B --> MOTOR B -

#define L9110S_A_IA 8 // D9 --> Motor A Input A --> MOTOR A +
#define L9110S_A_IB 9 // D8 --> Motor A Input B --> MOTOR A -

// functional connections
#define MOTOR_B_PWM L9110S_B_IA // Motor B PWM Speed
#define MOTOR_B_DIR L9110S_B_IB // Motor B Direction

#define MOTOR_A_PWM L9110S_A_IA // Motor A PWM Speed
#define MOTOR_A_DIR L9110S_A_IB // Motor A Direction


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#define PWM_SLOW 50  // arbitrary slow speed PWM duty cycle
#define PWM_FAST 200 // arbitrary fast speed PWM duty cycle
#define DIR_DELAY 500 // brief delay for abrupt motor changes


// defines pins numbers
const int trigPin = 4;
const int echoPin = 3;
// defines variables
long duration;
int distance;

void setup(){
  Serial.begin( 9600 );
  pinMode( MOTOR_B_DIR, OUTPUT );
  pinMode( MOTOR_B_PWM, OUTPUT );
  digitalWrite( MOTOR_B_DIR, LOW );
  digitalWrite( MOTOR_B_PWM, LOW );

    pinMode( MOTOR_A_DIR, OUTPUT );
  pinMode( MOTOR_A_PWM, OUTPUT );
  digitalWrite( MOTOR_A_DIR, LOW );
  digitalWrite( MOTOR_A_PWM, LOW );

    pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input


}

void loop(){

          // set the motor speed and direction
        digitalWrite( MOTOR_B_DIR, LOW); // direction = forward
        analogWrite( MOTOR_B_PWM, 255-PWM_FAST ); // PWM speed = fast

        digitalWrite( MOTOR_A_DIR, HIGH ); // direction = forward
        analogWrite( MOTOR_A_PWM, 255-PWM_FAST ); // PWM speed = fast
}