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23. Precision voltmeter using ADC

Build a voltmeter using Arduino UNO which measures voltage from 0 to 5 volts and provides a resolution

  • 1 mV resolution for a 0 to 1.1 volts voltage range.
  • 4.88 mV resolution for a 1.1 to 5 volts voltage range.



Hints: Change ADC voltage reference according to input voltage range.

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