void setup()
{
  Serial.begin(9600);
  ///////////////////////ADC INIT///////////////////////////////////////////////////
//    //DIDR0 = 0x00;           //Digital input disabled on all ADC ports
//    PRR &= ~(1<<PRADC);       //ADC turned on
//    ADMUX = 0x60;           //AVcc, right adjusted, ADC0 pin 
//    sei();
//    ADCSRA = 0xcF; 
  //Serial.println(__FILE__);
}

void loop()
{
 
 
  Serial.print("ADCSRA = ");
  Serial.print(ADCSRA);
  Serial.print("  Save ADCSRA ");
  byte adcsra_save = ADCSRA;
  Serial.println(" Set ADCSRA = 0");
  //ADCSRA = 0;
  //ADCSRA = ADCSRA & B01111111;
  //delay(100);
  ADCSRA &= ~ bit(ADEN); bitSet(PRR, PRADC);
  Serial.print("ADCSRA = ");
  Serial.print(ADCSRA);
  Serial.print(" Analog read port A0 = ");
  Serial.print(analogRead(A0));
  Serial.print(" ADCSRA = ");
  Serial.println(ADCSRA);
  PRR &= ~(1<<PRADC);
  ADCSRA = adcsra_save;
  //delay(100);
  Serial.print("Restore ADCSRA");
  Serial.print(" ADCSRA = ");
  Serial.print(ADCSRA);
  Serial.print(" Analog read port A0 = ");
  Serial.println(analogRead(A0)); 
  Serial.println("-----------------------------------------------------------------");
  
  delay(2000);
}




//// The following saves some extra power by disabling some 
//// peripherals I am not using.
//
//// Disable the ADC by setting the ADEN bit (bit 7)  of the
//// ADCSRA register to zero.
//ADCSRA = ADCSRA & B01111111;
//
//// Disable the analog comparator by setting the ACD bit
//// (bit 7) of the ACSR register to one.
//ACSR = B10000000;
//
//// Disable digital input buffers on all analog input pins
//// by setting bits 0-5 of the DIDR0 register to one.
//// Of course, only do this if you are not using the analog 
//// inputs for your project.
//DIDR0 = DIDR0 | B00111111;