#define ldrPin A0
#define pb1Pin 2
#define potPin A1
#define ledPin 9
int ldrValue = 0;
int pb1Value = 0;
int potValue = 0;
void setup() {
  Serial.begin(9600);
  pinMode(pb1Pin, INPUT);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  pb1Value = digitalRead(pb1Pin);
  if (pb1Value == HIGH) {
    Serial.println("light ON");
    digitalWrite(ledPin, HIGH);
  }
  else {
    ldrValue = analogRead(ldrPin);
    potValue = analogRead(potPin);
    if (ldrValue < potValue) {
      Serial.println("light ON");
      digitalWrite(ledPin, HIGH);
    }
    else {
      Serial.println("light OFF");
      digitalWrite(ledPin, LOW);
    }
  }
}