Rotary Encoder or Arduino 360 Degree Encoder

1/**************
2 * VCC to 5V  *
3 * GND to GND *
4 * CLK to D3
5  *
6 * CLK to D4  *
7 **************/
8int pinA = 3;
9int pinB = 4; 
10int
11  encoderPosCount = 0; 
12int pinALast;  
13int aVal;
14boolean bCW;
15
16 void
17  setup() 
18 { 
19  //SET pinA and pinB and input
20   pinMode (pinA,INPUT);
21
22   pinMode (pinB,INPUT);
23   pinALast = digitalRead(pinA);//Read Pin A 
24   Serial.begin
25  (9600);
26   Serial.println("BEGIN");
27   Serial.println();
28 } 
29
30
31  void loop() 
32 { 
33   aVal = digitalRead(pinA);
34   if (aVal != pinALast)
35
36   { 
37     if (digitalRead(pinB) != aVal) //We're Rotating Clockwise
38     {
39  
40       encoderPosCount ++;
41       bCW = true;
42     } 
43     
44     else
45  
46     
47     {
48       bCW = false;
49       encoderPosCount--;
50     }
51
52     
53     if (bCW)
54     {
55       Serial.println ("Rotate Clockwise");
56
57     }
58     
59     else
60     
61     {
62       Serial.println("Rotate
63  Counterclockwise");
64     }
65     
66     Serial.print("Encoder Count: ");
67
68     Serial.println(encoderPosCount);
69     Serial.println();
70   } 
71   
72
73   pinALast = aVal;
74 } 

1/**************
2 * VCC to 5V  *
3 * GND to GND *
4 * CLK to D3  *
5 * CLK to D4  *
6 **************/
7int pinA = 3;
8int pinB = 4; 
9int  encoderPosCount = 0; 
10int pinALast;  
11int aVal;
12boolean bCW;
13
14 void  setup() 
15 { 
16  //SET pinA and pinB and input
17   pinMode (pinA,INPUT);
18   pinMode (pinB,INPUT);
19   pinALast = digitalRead(pinA);//Read Pin A 
20   Serial.begin  (9600);
21   Serial.println("BEGIN");
22   Serial.println();
23 } 
24
25  void loop() 
26 { 
27   aVal = digitalRead(pinA);
28   if (aVal != pinALast)
29   { 
30     if (digitalRead(pinB) != aVal) //We're Rotating Clockwise
31     {  
32       encoderPosCount ++;
33       bCW = true;
34     } 
35     
36     else  
37     
38     {
39       bCW = false;
40       encoderPosCount--;
41     }
42     
43     if (bCW)
44     {
45       Serial.println ("Rotate Clockwise");
46     }
47     
48     else
49     
50     {
51       Serial.println("Rotate  Counterclockwise");
52     }
53     
54     Serial.print("Encoder Count: ");
55     Serial.println(encoderPosCount);
56     Serial.println();
57   } 
58   
59   pinALast = aVal;
60 }