int B = 3;
int G = 5;
int R = 6;
int valB;


void setup() {
  // put your setup code here, to run once:
   pinMode(B, OUTPUT);
   pinMode(G, OUTPUT);
   pinMode(R, OUTPUT); 
   pinMode(A0, INPUT);
   
}

void loop() {
  // ut your main code here, to run repeatedly:
  valB = analogRead(A0);
  valB = map(valB, 0, 1023, 0, 255);
  analogWrite(B,valB);
  analogWrite(G, 100);
  analogWrite(R, 100);

}