Precision voltmeter using ADC

Solving Approach:

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Code

/*Paste your code here*/
#define potpin A0
uint8_t current_analogReference;
float voltageval;
int potval;
void setup()
{
  Serial.begin(9600);
  analogReference(INTERNAL);
  current_analogReference = INTERNAL;
}

void loop()
{
  if(potval == 1023 && current_analogReference == INTERNAL){
    analogReference(DEFAULT);
    current_analogReference = DEFAULT;
  }
  if(potval < 225 && current_analogReference == DEFAULT){
    analogReference(INTERNAL);
    current_analogReference = INTERNAL;
  }
  potval = analogRead(potpin);
  if(current_analogReference == DEFAULT)
  	voltageval = (float) potval / 1023 * 5.0;
  else 
    voltageval = (float) potval / 1023 * 1.1;
  Serial.print("ADC Value: ");
  Serial.print(potval);
  Serial.print(" | Voltage: ");
  Serial.println(voltageval, 3);
  delay(500);
}


 

Output

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