Arduino Uno Analog Pin (ADC)

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1

Hi,

May I know what is the maximum voltage that Arduino Uno Analog pin can read up to?

I'm intending to use the analog input pin to measure my battery voltage (low battery detector). Im using 9V voltage, when it low bat, its around 7V. Is it possible for me to measure it using analog input?

Regards,
Cliqck

2

It will measure up to Vcc which in this case is 5V.

You can measure a 9V battery with a voltage divider.

See this page: http://www.gammon.com.au/forum/?id=11506

Scroll down to "Low voltage detector".

There would be lots of similar posts elsewhere about how to solve this.