1. //L293D
2. //Motor A (left)
3. const int motorPin1  = 9;  // Pin 2 of L293
4. const int motorPin2  = 10;  // Pin 7 of L293
5. //Motor B (right)
6. const int motorPin3  = 11; // Pin  10 of L293
7. const int motorPin4  = 12;  // Pin  15 of L293
8.  
9. #define TIME_WAIT 7200 //10sec
10.  
11. void setup() {
12.   //Set pins as outputs
13.   pinMode(motorPin1, OUTPUT);
14.   pinMode(motorPin2, OUTPUT);
15.   pinMode(motorPin3, OUTPUT);
16.   pinMode(motorPin4, OUTPUT);
17. }
18.  
19. void motor_a_stop() {
20.   digitalWrite(motorPin1, LOW);
21.   digitalWrite(motorPin2, LOW);
22. }
23.  
24. void motor_a_forward() {
25.   digitalWrite(motorPin1, LOW);
26.   digitalWrite(motorPin2, HIGH);
27. }
28.  
29. void motor_a_backward() {
30.   digitalWrite(motorPin1, HIGH);
31.   digitalWrite(motorPin2, LOW);
32. }
33.  
34. void motor_b_stop() {
35.   digitalWrite(motorPin3, LOW);
36.   digitalWrite(motorPin4, LOW);
37. }
38.  
39. void motor_b_forward() {
40.   digitalWrite(motorPin3, LOW);
41.   digitalWrite(motorPin4, HIGH);
42. }
43.  
44. void motor_b_backward() {
45.   digitalWrite(motorPin3, HIGH);
46.   digitalWrite(motorPin4, LOW);
47. }
48.  
49. void left_stop() {
50.   motor_a_stop();
51. }
52.  
53. void right_stop() {
54.   motor_b_stop();
55. }
56.  
57. void stop() {
58.   left_stop();
59.   right_stop();
60. }
61.  
62. void left_forward() {
63.   motor_a_backward();
64. }
65.  
66. void left_backward() {
67.   motor_a_forward();
68. }
69.  
70. void right_forward() {
71.   motor_b_forward();
72. }
73.  
74. void right_backward() {
75.   motor_b_backward();
76. }
77.  
78. void forward() {
79.   left_forward();
80.   right_forward();
81. }
82.  
83. void backward() {
84.   left_backward();
85.   right_backward();
86. }
87.  
88. void left_rotate() {
89.   left_backward();
90.   right_forward();
91. }
92.  
93. void right_rotate() {
94.   left_forward();
95.   right_backward();
96. }
97.  
98. void left_circle() {
99.   left_stop();
100.   right_forward();
101. }
102.  
103. void right_circle() {
104.   right_stop();
105.   left_forward();
106. }
107.  
108. void wait() {
109.   delay(TIME_WAIT);
110.   stop();
111. }
112.  
113. void loop() {
114.   forward();
115.   wait();
116.   backward();
117.   wait();
118.   left_rotate();
119.   wait();
120.   right_rotate();
121.   wait();
122.   left_circle();
123.   wait();
124.   right_circle();
125.   wait();
126.   stop();
127.   delay(1800);
128. }