Wrong analogRead values

Using Arduino Programming Questions
25

AWOL:
Try this: (Compiled but untested.)

const int numReadings = 100;

const int analogInPin = A0; 
int inputReading [numReadings];

void setup()
{
  Serial.begin(115200);
}

void loop()
{
  for (int i = 0; i < numReadings; i++) {
    inputReading [i]= analogRead(analogInPin); // roughly 9kHz sampling
  }
 
  for (int i = 0; i < numReadings; i++) {   
    float voltage = ((inputReading[i]/1023.0)*5.0);                             
    Serial.println(voltage); 
  }
}

I tried connecting a 10k resistor as someone suggested. And it WORKED !. I uploaded your code for fun and it also works. Its a bit better than mine.... :frowning: