#define LED_PIN  13
#define LED_PIN2 12
#define LDR_PIN  A0
#define POT_PIN  A1
void setup()
{
pinMode(LED_PIN, OUTPUT);
pinMode(LED_PIN2, OUTPUT);
}
void loop()
{
int lightness = analogRead(LDR_PIN);
int threshold = analogRead(POT_PIN);
int brightness = analogRead(LDR_PIN);
boolean Dark = (lightness <threshold);
boolean Dark2 = (lightness/2 <threshold);
analogWrite(LED_PIN, brightness);
analogWrite(LED_PIN2, brightness);
if (Dark) {
digitalWrite(LED_PIN, HIGH);
} else {
digitalWrite(LED_PIN, LOW);
}
if  (Dark2) {
digitalWrite(LED_PIN2, HIGH);
} else {
digitalWrite(LED_PIN2, LOW);
}
}