#define redled 7
#define greenled 6
#define ldrPin A0

void setup () {
 Serial.begin(9600);
 pinMode(redled, OUTPUT); 
 pinMode(greenled, OUTPUT);
 }
void loop() {
int ldrstatus = analogRead(ldrPin);
Serial.println(ldrstatus);
if (ldrstatus >= 600) {
digitalWrite(greenled, HIGH);
digitalWrite(redled, LOW);
}
else{
digitalWrite(redled, HIGH);
digitalWrite(greenled, LOW);
}
}