Reddit LDR checker v 1.0

/*
  LDR module checker ---- 18 September 2019

  This sketch is just for detecting an LDR module's sensitivity.
  Specifically for the Keyes K853518 LDR module (or similar) that already has a voltage divider on it.

  This sketch prints the LDR's value to the serial monitor every 3 seconds.
*/

int ldr_out_pin = A0; // This should be a yellow wire on the module, labeled "OUT".
int ldr_value = 0;
// The VCC wire on the module gets connected to the 5v pin on the Arduino.
// The black wire on the module gets connected to any ground pin on the Arduino.


void setup() {
  Serial.begin(9600);
  pinMode(ldr_out_pin, INPUT);
  Serial.println("Exiting setup()");
}

void loop() {
  ldr_value = analogRead(ldr_out_pin);
  Serial.print("Sensor value = ");
  Serial.println(ldr_value);
  delay(3000);
}