LED Controller using Potentiometer

1// Potentiometer P = Potentiometer Data PV = Potentiometer value
2int const P = A0;
3int PV;
4// LED R = Red Y = Yellow G = Green
5const int R = 13;
6const int Y = 12;
7const int G = 11;
8
9int angle;
10
11void setup() {
12
13  pinMode(R, OUTPUT);
14  pinMode(Y, OUTPUT);
15  pinMode(G, OUTPUT);
16}
17
18void loop() {
19  PV = analogRead(P);
20  // PV = Number to be scaled, 0 = minimum value of input, 1023 = maximum value of input, 0 = minumum value of output, 2 = maximum value of output
21  angle = map(PV, 0, 1023, 0, 2);
22
23  if (angle == 2) {
24    digitalWrite(G, HIGH);
25    digitalWrite(R, LOW);
26    digitalWrite(Y, LOW);
27  }
28  
29  if (angle == 1) {
30    digitalWrite(G, LOW);
31    digitalWrite(R, LOW);
32    digitalWrite(Y, HIGH);
33  }
34  
35  if (angle == 0) {
36    digitalWrite(G, LOW);
37    digitalWrite(R, HIGH);
38    digitalWrite(Y, LOW);
39  }
40}