const int LDR_PIN = 34;
const int LED1_PIN = 32;
const int LED2_PIN = 12;
const int LED3_PIN = 13;
const int LED4_PIN = 14;
void setup() {
 pinMode(LED1_PIN, OUTPUT);
pinMode(LED2_PIN, OUTPUT);
pinMode(LED3_PIN, OUTPUT);
pinMode(LED4_PIN, OUTPUT);
}

void loop() {
int sensorValue = analogRead(LDR_PIN);

if(sensorValue < 1000) {
  digitalWrite(LED1_PIN, HIGH);
  digitalWrite(LED2_PIN, HIGH);
  digitalWrite(LED3_PIN, HIGH);
  digitalWrite(LED4_PIN, HIGH);
}
else if(sensorValue <2000){
  digitalWrite(LED1_PIN, LOW);
  digitalWrite(LED2_PIN, HIGH);
  digitalWrite(LED3_PIN, HIGH);
  digitalWrite(LED4_PIN, HIGH);
}
else if (sensorValue < 3000){
   digitalWrite(LED1_PIN, LOW);
  digitalWrite(LED2_PIN, LOW);
  digitalWrite(LED3_PIN, HIGH);
  digitalWrite(LED4_PIN, HIGH);
}
else if (sensorValue < 4000){
   digitalWrite(LED1_PIN, LOW);
  digitalWrite(LED2_PIN, LOW);
  digitalWrite(LED3_PIN, LOW);
  digitalWrite(LED4_PIN, HIGH);
}
else {
   digitalWrite(LED1_PIN, LOW);
  digitalWrite(LED2_PIN, LOW);
  digitalWrite(LED3_PIN, LOW);
  digitalWrite(LED4_PIN, LOW);
}
delay(100);
}