//www.elegoo.com
//2016.12.12

/ Exercise the motor using the L293D chip /

define ENABLE 5

define DIRA 3

define DIRB 4

int i;

void setup() {
//—set pin direction
pinMode(ENABLE,OUTPUT);
pinMode(DIRA,OUTPUT);
pinMode(DIRB,OUTPUT);
Serial.begin(9600);
}

void loop() {

//—back and forth example
Serial.println(“One way, then reverse”);
digitalWrite(ENABLE,HIGH); // enable on
for (i=0;i<5;i++) {
digitalWrite(DIRA,HIGH); //one way
digitalWrite(DIRB,LOW);
delay(750);
digitalWrite(DIRA,LOW); //reverse
digitalWrite(DIRB,HIGH);
delay(750);
}
digitalWrite(ENABLE,LOW); // disable
delay(3000);
for (i=0;i<5;i++) {
digitalWrite(DIRA,HIGH); //one way
digitalWrite(DIRB,LOW);
delay(750);
digitalWrite(DIRA,LOW); //reverse
digitalWrite(DIRB,HIGH);
delay(750);
}
digitalWrite(ENABLE,LOW); // disable
delay(3000);
}