So which reference will arduino uno take by default 1.1V or 5V or 3.3V?
If you do provide an external voltage reference to this pin you must call analogReference(EXTERNAL) in setup () before any call to analogRead() - otherwise you will internally short your reference to 5V and potentially burn out the chip. ...You could connect an external voltage via a 1k resistor as a temperary testing setup - then the chip is safe (but analogRead() will be upto 3% wrong...)
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