ADCSRA &= ~(1 << ADIE); // remove interrupt
// 1.1 reference voltage, left aligned
- ADMUX = (ADMUX & ~0x1f)| (1 << ADLAR) | 0x1e;
+ ADMUX = (ADMUX & ~0x1f)| (0 << ADLAR) | 0x1e;
ADCSRA |= (1 << ADSC) ; // start conversion
while (ADCSRA & (1 << ADSC))
;