/* LDR test measuring with A0 in middle of 10k Ohm resistor and LDR
 * +5V ---[ LDR ]---+---[ Resistor ]--- GND
                 |
              Analog A0
*/ 

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

void loop() {
  int value = analogRead(A0);  // Reads value between 0 and 1023
  Serial.println(value);
  delay(500);
}