Analog reading whit registers

[JohnRob]

@penispena

void loop() {  
  //REFS1 AND REFS0 to 1 1 -> internal 1.1V refference
  ADMUX |= B11000000;   
  //We read A2 (MUX0)
  ADMUX |= B0000100;      
 

My guess is the second assignment to ADMUX negates the first.

Its been a long time since I've done register manipulation so I can't provide code suggestions.