Arduino Traffic Light Simulator Code

int GREEN = 2;
int YELLOW = 3;
int RED = 4;
int DELAY_GREEN = 5000;
int DELAY_YELLOW = 2000;
int DELAY_RED = 5000;

void setup()
{
pinMode(GREEN, OUTPUT);
pinMode(YELLOW, OUTPUT);
pinMode(RED, OUTPUT);
}

void loop()
{
green_light();
delay(DELAY_GREEN);
yellow_light();
delay(DELAY_YELLOW);
red_light();
delay(DELAY_RED);
}

void green_light()
{
digitalWrite(GREEN, HIGH);
digitalWrite(YELLOW, LOW);
digitalWrite(RED, LOW);
}

void yellow_light()
{
digitalWrite(GREEN, LOW);
digitalWrite(YELLOW, HIGH);
digitalWrite(RED, LOW);
}

void red_light()
{ digitalWrite(GREEN, LOW);
digitalWrite(YELLOW, LOW);
digitalWrite(RED, HIGH);
}

Temperature Monitor Code

//Libraries
#include // sensor library using lib from https://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
#include // LCD library using from https://www.ardumotive.com/i2clcden.html for the i2c LCD library
#include
dht DHT;

//Constants
// DHT 22 (AM2302) - pin used for DHT22
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 after finding it from serial monitor (see comment above) for a 16 chars and 2 line display

//Variables
float hum; //Stores humidity value
float temp; //Stores temperature value
void setup()
{
Serial.begin(9600);
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.setBacklight(HIGH);
}
void loop()
{
int chk = DHT.read22(DHT22_PIN);
//Read data and store it to variables hum and temp
hum = DHT.humidity;
temp= DHT.temperature;
//Print temp and humidity values to LCD
lcd.setCursor(0,0);
lcd.print("Humidity: ");
lcd.print(hum);
lcd.print("%");
lcd.setCursor(0,1);
lcd.print("Temp: ");
lcd.print(temp);
lcd.println("Celcius");
delay(2000); //Delay 2 sec between temperature/humidity check.
}