RGB_Model.c

//Pins 
  int redled = 11; 
  int greenled = 10;
  int blueled = 9;
  int an2 = 2;
   
//Colours
  int red = 255;
  int green = 255;
  int blue = 255;
  
//Sensing  
  int sensepin = 0;
  int senseval = 0;
  float sensevolt =0.00;
  float setval = 0.0;
//Basic Mapping
  int redmapped = map(red,0,255,0,150);
  int greenmapped = map(green,0,255,0,200);
  int bluemapped = map(blue,0,255,0,255);
//Fade Helpers 
  int redmapped2 = map(senseval,100,950,0,redmapped);
  int greenmapped2 = map(senseval,100,950,0,greenmapped);
  int bluemapped2 = map(senseval,100,950,0,bluemapped);

 
  
void setup() {
   Serial.begin(9600);
   pinMode(an2,INPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(redled, OUTPUT);
  pinMode(greenled, OUTPUT);
  pinMode(blueled, OUTPUT);


  
  digitalWrite(LED_BUILTIN,HIGH); 
  analogWrite(redled, redmapped);            //150
  analogWrite(greenled, greenmapped);        //200   
  analogWrite(blueled, bluemapped);          //255

  delay(1000);
   
 
}

void loop() {
  boolean boo = false;
  if (analogRead(an2)<1000 ){boo=true;}
  if (boo==true){senseval=setval;}
    
    
  
  digitalWrite(LED_BUILTIN,HIGH);
  senseval = analogRead(sensepin);
  int redmapped = map(red,0,255,0,150);
  int greenmapped = map(green,0,255,0,200);
  int bluemapped = map(blue,0,255,0,255);
  senseval = constrain(senseval,setval,950);
  int redmapped2 = map(senseval,setval,950,0,redmapped);
  int greenmapped2 = map(senseval,setval,950,0,greenmapped);
  int bluemapped2 = map(senseval,setval,950,0,bluemapped);
  sensevolt =  ((float)senseval)*5/1023;  
  Serial.println(boo);
  digitalWrite(LED_BUILTIN,LOW); 
  analogWrite(redled, redmapped2);            //150
  analogWrite(greenled, greenmapped2);        //200   
  analogWrite(blueled, bluemapped2); 
 

boo=false;
    
  
}