Tinylab analog sensor test

#define pot_pin A0
#define ldr_pin A2
#define lm35_pin A3

void setup()
{
  Serial.begin(9600);
  while (! Serial);
  Serial.println("Analog input example");
  delay(500);
}

void loop()
{
  int pot_val = analogRead(pot_pin);
  int ldr_val = ((2500.0 / (analogRead(ldr_pin) * (5.0 / 1024.0))) - 500) / 10.0;
  int lm35_val = (5.0 * analogRead(lm35_pin) * 100.0) / 1024;
  Serial.print("Potentiometer value: ");
  Serial.println(pot_val);
  Serial.print("LDR value: ");
  Serial.println(ldr_val);
  Serial.print("Temperature: ");
  Serial.println(lm35_val);
  delay(100);
}