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const int R=9;
const int G=10; 
const int B=11; 
const int BOTO=2;
const int POT=A0;  
 
int valor=0;
int polsador;
int led;
int val;
 
void setup() {
  Serial.begin(9600);
  pinMode (R, OUTPUT );
  pinMode (G, OUTPUT );
  pinMode (B, OUTPUT);
  pinMode (BOTO, INPUT);
}
 
void loop() {
  polsador=digitalRead(BOTO);
  if(polsador==0)
  {
        valor=valor+1;
        valor=valor%3;    //valors entre 0 i 2
      analogWrite(B, 0);
      analogWrite(G, 0);
      analogWrite(R, 0);
   if(valor==0)
   {
        led=9;
        Serial.println("red");
 
    }
   else  if(valor==1)
   {
      led=10;
      Serial.println("verd");
    }
    else  if(valor==2)
    {
      led=11;
      Serial.println("blau");
    }
 
    }
    val = analogRead(POT);
 
    val = map(val, 0, 1023, 0, 255);
    analogWrite(led, val);
    Serial.println(val);
    delay(100);
}

prog.cpp:5:15: error: 'A0' was not declared in this scope
 const int POT=A0;  
               ^
prog.cpp: In function 'void setup()':
prog.cpp:13:3: error: 'Serial' was not declared in this scope
   Serial.begin(9600);
   ^
prog.cpp:14:15: error: 'OUTPUT' was not declared in this scope
   pinMode (R, OUTPUT );
               ^
prog.cpp:14:22: error: 'pinMode' was not declared in this scope
   pinMode (R, OUTPUT );
                      ^
prog.cpp:17:18: error: 'INPUT' was not declared in this scope
   pinMode (BOTO, INPUT);
                  ^
prog.cpp: In function 'void loop()':
prog.cpp:21:28: error: 'digitalRead' was not declared in this scope
   polsador=digitalRead(BOTO);
                            ^
prog.cpp:26:23: error: 'analogWrite' was not declared in this scope
       analogWrite(B, 0);
                       ^
prog.cpp:32:9: error: 'Serial' was not declared in this scope
         Serial.println("red");
         ^
prog.cpp:38:7: error: 'Serial' was not declared in this scope
       Serial.println("verd");
       ^
prog.cpp:43:7: error: 'Serial' was not declared in this scope
       Serial.println("blau");
       ^
prog.cpp:47:25: error: 'analogRead' was not declared in this scope
     val = analogRead(POT);
                         ^
prog.cpp:49:35: error: 'map' was not declared in this scope
     val = map(val, 0, 1023, 0, 255);
                                   ^
prog.cpp:50:25: error: 'analogWrite' was not declared in this scope
     analogWrite(led, val);
                         ^
prog.cpp:51:5: error: 'Serial' was not declared in this scope
     Serial.println(val);
     ^
prog.cpp:52:14: error: 'delay' was not declared in this scope
     delay(100);
              ^

Standard output is empty