About GP2Y1010AU0F Voltage Out

Hi everyone. I am using Arduino Nano and GP2Y1010AU0F Dust Sensor. Actually everything is fine.

Vled--------------Arduino 5v
Led-Gnd--------Arduino GND
led----------------D2 pin
S-GND-----------Arduino GND
Vo-----------------Analog pin 0
VCC---------------Arduino 5v

And I use 150 ohm resistor and 220 uF capacitor like datasheet.

This is my test code:

int measurePin = A0;
int ledPower = 2;

unsigned int samplingTime = 280;
unsigned int deltaTime = 40;
unsigned int sleepTime = 9680;

float voMeasured = 0;
float calcVoltage = 0;
float dustDensity = 0;

void setup(){
  Serial.begin(9600);
  pinMode(ledPower,OUTPUT);
}

void loop(){
  digitalWrite(ledPower,LOW);
  delayMicroseconds(samplingTime);

  voMeasured = analogRead(measurePin);

  delayMicroseconds(deltaTime);
  digitalWrite(ledPower,HIGH);
  delayMicroseconds(sleepTime);

  calcVoltage = voMeasured*(5.0/1024);
  dustDensity = 0.17*calcVoltage-0.1;

  if ( dustDensity < 0)
  {
    dustDensity = 0.00;
  }

  Serial.println("Raw Signal Value (0-1023):");
  Serial.println(voMeasured);

  Serial.println("Voltage:");
  Serial.println(calcVoltage);

  Serial.println("Dust Density:");
  Serial.println(dustDensity);

  delay(1000);
}

Everything is ok but when i try to measure Analog voltage with my multimeter, i could not see 3.46 v or 0.42 volt. Just i can see 7 mV or 18 mV. How can it possible??

I want to put an op-amp (for comparator with lm358 or lm393) to sensor Vout pin but for now a little bit confused.

if anybody help me , really aprreciated.

Best regards..

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