On the Atmega328 ic chip, does the AREF pin have to go to GND or VCC or can I just leave it be.
What I want to know is if I am using the Analog pins, does the AREF pin have to go to GND.
I am trying to set-up the chip on A bread board.
Internal reference voltages of nominally 1.1V or AVCC are provided On-chip.
The voltage reference may be externally decoupled at the AREF pin by a capacitor for better noise performance.
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Optionally, AVCC or an internal 1.1V reference voltage may be connected to the AREF pin by writing to the REFSn bits in the ADMUX Register.
The internal voltage reference may thus be decoupled by an external capacitor at the AREF pin to improve
noise immunity.
This pin can be left floating.
Accoding to the schematic (click), the Uno R3 has this pin floating too, no capacitor connected either.
This pin certainly doesn't go to GND.
no capacitor connected either.
On the official schematic, the AREF capacitor is show over near the connector, instead of near the chip.