Use your smartphone to control an airboat

01 // Airboat with 3 fans controlled by a bluetooth phone
02
03 int INA1 = 6;  // back fan
04 int INB1 = 7;  // back fan
05 int INA2 = 8;  // right side fan
06 int INB2 = 9;  // right side fan
07 int INA3 = 10; // left side fan
08 int INB3 = 11; // left side fan
09
10 char thekey;  // input from Bluetooth phone
11
12 void setup()
13 {
14   // initialize the serial communication:
15   Serial.begin(9600); //baud rate of Bluetooth Module
16   // define the pins of the 3 fans as outputs
17   pinMode(INA1,OUTPUT);
18   pinMode(INB1,OUTPUT);
19   pinMode(INA2,OUTPUT);
20   pinMode(INB2,OUTPUT);
21   pinMode(INA3,OUTPUT);
22   pinMode(INB3,OUTPUT);
23   // start with all fans turned off
24   digitalWrite(INA1,LOW);
25   digitalWrite(INB1,LOW);
26   digitalWrite(INA2,LOW);
27   digitalWrite(INB2,LOW);
28   digitalWrite(INA3,LOW);
29   digitalWrite(INB3,LOW);
30 }
31
32 void loop() {
33
34   if (Serial.available() > 0) {
35     thekey = Serial.read(); // get the key from the phone
36
37     //  "s" stops all fans
38     if (thekey == 's') {
39       Serial.println("Fans are stopped");
40       digitalWrite(INB1,LOW);
41       digitalWrite(INB2,LOW);
42       digitalWrite(INB3,LOW);
43       delay(1500);
44     }
45     //  "g" runs all fans
46     if (thekey == 'g') {
47       Serial.println("Fans are going");
48       digitalWrite(INB1,HIGH);
49       digitalWrite(INB2,HIGH);
50       digitalWrite(INB3,HIGH);
51     }
52     //  "l" only run right fan, turn left
53     if (thekey == 'l') {
54       Serial.println("Turn left");
55       digitalWrite(INB1,LOW);
56       digitalWrite(INB2,HIGH);
57       digitalWrite(INB3,LOW);
58     }
59     // "r" only run left fan, turn right
60     if (thekey == 'r') {
61       Serial.println("Turn right");
62       digitalWrite(INB1,LOW);
63       digitalWrite(INB2,LOW);
64       digitalWrite(INB3,HIGH);
65     }
66    }
67 }