Pololu Acs709 current sensor

Other Hardware Sensors
1

What code should I use to measure correct current in my circuit?Pololu has given some sample code but I can't understand the idea and write my own code.Here is the code given:
VIOUT = (0.028 V/A * i + 2.5 V) * VCC / 5 V
pololu page

2

Here's one way, maybe not the best but give it a try.

void setup() {
  Serial.begin(9600);
}

void loop() {
  float aRef = 4.98; // AREF voltage measured with accurate volt meter
  float amps;

  amps = (analogRead(A0) * aRef / 1023.0 - (aRef / 2)) / 0.028;
  Serial.println(amps);
  delay(1000); 
}
3

Guys who I bought it from gave me a peace of code:

current_sensor = analogRead(A8);
output_amp = (current_sensor/2 - (current_sensor*5.0/1024))/5.734;
amps = output_amp/1000;

but I'll try yours as well.thanks!