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+//www.elegoo.com
+//2016.09.12
+
+/*define logic control output pin*/
+int in1=9;
+int in2=8;
+int in3=7;
+int in4=6;
+/*define channel enable output pins*/
+int ENA=10;
+int ENB=5;
+/*define forward function*/
+void _mForward()
+{
+ digitalWrite(ENA,HIGH);
+ digitalWrite(ENB,HIGH);
+ digitalWrite(in1,LOW);//digital output
+ digitalWrite(in2,HIGH);
+ digitalWrite(in3,LOW);
+ digitalWrite(in4,HIGH);
+ Serial.println("Forward");
+}
+/*define back function*/
+void _mBack()
+{
+ digitalWrite(ENA,HIGH);
+ digitalWrite(ENB,HIGH);
+ digitalWrite(in1,HIGH);
+ digitalWrite(in2,LOW);
+ digitalWrite(in3,HIGH);
+ digitalWrite(in4,LOW);
+ Serial.println("Back");
+}
+/*define left function*/
+void _mleft()
+{
+ digitalWrite(ENA,HIGH);
+ digitalWrite(ENB,HIGH);
+ digitalWrite(in1,LOW);
+ digitalWrite(in2,HIGH);
+ digitalWrite(in3,HIGH);
+ digitalWrite(in4,LOW);
+ Serial.println("Left");
+}
+/*define right function*/
+void _mright()
+{
+ digitalWrite(ENA,HIGH);
+ digitalWrite(ENB,HIGH);
+ digitalWrite(in1,HIGH);
+ digitalWrite(in2,LOW);
+ digitalWrite(in3,LOW);
+ digitalWrite(in4,HIGH);
+ Serial.println("Right");
+}
+/*put your setup code here, to run once*/
+void setup() {
+ Serial.begin(9600); //Open the serial port and set the baud rate to 9600
+/*Set the defined pins to the output*/
+ pinMode(in1,OUTPUT);
+ pinMode(in2,OUTPUT);
+ pinMode(in3,OUTPUT);
+ pinMode(in4,OUTPUT);
+ pinMode(ENA,OUTPUT);
+ pinMode(ENB,OUTPUT);
+}
+/*put your main code here, to run repeatedly*/
+void loop() {
+_mForward();
+delay(1000);
+_mBack();
+delay(1000);
+_mleft();
+delay(1000);
+_mright();
+delay(1000);
+}