Arduino Beginner Series: Project 10: Turn LED on if lights are off

Hello everyone!! Welcome to this post on Arduino LED Projects!!
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So in this project the Green Led is on if lights in the room are on and red LED turns on if the room lights are off.

Demo:

This is what my project looks like:

Things Required:

1. Arduino UNO
2. LEDs (1 of green and red each)
3. Breadboard
4. 220 ohm resistor (x2)
5. Jumper Wires
6. Photoresistor
7. 5k ohm resistor
8. Arduino IDE on computer

Functions used:

1. digitalWrite()
2. Serial.println()
3. analogRead()
4. pinMode()

Reference Material:

I used this (LINK) video as a reference.

Code:

View on/ Download from Github: (LINK)

int redled=9;
int greenled=8;
int lightpin=A2;
int lightval;

void setup() {
  // put your setup code here, to run once:
  pinMode(lightpin, INPUT);
  pinMode(redled, OUTPUT);
  pinMode(greenled, OUTPUT);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
  lightval= analogRead(lightpin);
  Serial.println(lightval);

  if(lightval<100){
    digitalWrite(redled, HIGH);
    digitalWrite(greenled, LOW);
  } else {
    digitalWrite(redled, LOW);
    digitalWrite(greenled, HIGH);
  }
}

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Happy Learning!!