const int irsensor =  A0;

int sensorValue = 0;
float distanceCm = 0;

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

void loop(){
sensorValue = analogRead(irsensor);
distanceCm = 27.86/ (sensorValue - 0.42);

Serial.print("Distance: ");
Serial.print(distanceCm);
Serial.println("cm ");
Serial.println(sensorValue);

delay(500);
}